Heating and temperature measuring device and method for eliminating temperature difference between inside and outside of sample cavity of diamond anvil cell

Abstract

The application discloses a heating and temperature measuring device and method for eliminating temperature difference between inside and outside of a sample cavity of a diamond anvil cell, and relates to the technical field of DAC pressure device testing. The device comprises a diamond pad and an electric furnace. The electric furnace is used for being installed on the side of the diamond anvil and transmits heat into the diamond anvil through the diamond pad. The electric furnace and the diamond pad are symmetrically arranged about the axis of the diamond anvil. The method is realized based on the device. The temperature measuring device and method can measure the real temperature of the sample in situ and quantitatively measure the deviation between the measured temperature and the real temperature.

Description

Technical Field

[0001] This invention relates to the field of DAC pressure device testing technology, and more specifically, to a heating and temperature measurement device and method for eliminating the temperature difference between the inside and outside of the sample chamber of a diamond anvil cell. Background Technology

[0002] The diamond anvil cell (DAC) is currently the most widely used high-pressure loading method in scientific research internationally. DAC pressure loading devices are usually combined with heating technology to achieve simultaneous high temperature and high pressure loading. Currently, heating techniques in DAC experiments are mainly divided into resistance heating (including internal resistance heating and external resistance heating) and laser heating.

[0003] Laser heating can typically achieve loading and control temperatures above 1200K, with reports indicating a maximum of 6700K, making it the highest temperature achievable among the three heating techniques mentioned. However, due to the small laser spot size (generally below 50μm), the temperature gradient of laser heating is extremely high, even reaching ~10. 8 K / m; Internal resistance heating can effectively improve the temperature gradient problem in laser heating. Internal heating typically involves two assemblies: one for metallic samples, where the sample is directly energized and used as the heating element; the other involves installing a miniature electric furnace inside a diamond pressure chamber to heat the sample. Regardless of the assembly, a combined sealing gasket is required, and connection circuitry, external insulation, and heat insulation treatment must be performed within a gasket area of ​​tens of μm. The structure is very complex, demanding high operator skill and is often difficult to execute. Furthermore, both of the aforementioned heating methods rely on radiation thermometry, making it difficult to achieve precise temperature control and measurement below 1000K.

[0004] External resistance heating technology overcomes this drawback of laser heating and internal resistance heating technologies. External heating typically involves placing a miniature electric furnace (made of graphite or other materials) around a diamond anvil cell. Current is supplied to the resistance wire via an external voltage regulator. The Joule heat generated by the energized resistance wire is transferred to the sample through heat conduction and radiation via the diamond anvil cell, thus heating the sample. External heating technology has been in use for over fifty years, and recent research reports continue to focus on optimizing external heating devices.

[0005] In existing technologies, most research on external heating techniques focuses on improving the upper limits of temperature and pressure, with little attention paid to the accuracy of temperature measurement. The common practice is to ignore the temperature difference between the sample chamber and the diamond side surface, directly using the temperature of the diamond side surface measured by the thermocouple as the sample temperature. However, research has found that a non-negligible temperature difference exists between the diamond side surface and the interior of the pressure chamber, leading to significant discrepancies in the measurement results.

[0006] Therefore, the external heating technology of traditional DAC pressure devices cannot measure the true temperature of the sample in situ, and the deviation between the measured temperature and the true temperature cannot be accurately quantified.

[0007] In view of the above, this application is hereby submitted. Summary of the Invention

[0008] The purpose of this invention is to provide a heating and temperature measurement device and method for eliminating the temperature difference between the inside and outside of the sample cavity of a diamond anvil cell. The device and method enhance heat transfer through symmetrical structural design, improve the uniformity of temperature field distribution in the heating area, and can measure the true temperature of the sample in situ and quantify the deviation between the measured temperature and the true temperature.

[0009] The embodiments of the present invention are implemented as follows:

[0010] Firstly, a heating and temperature measuring device for eliminating the temperature difference between the inside and outside of the sample cavity of a diamond anvil cell includes a diamond pad and an electric furnace. The diamond pad forms a mounting cavity for mounting the diamond anvil, and the electric furnace is mounted on the side of the diamond anvil and generates heat that is transferred to the diamond anvil through the diamond pad. A high-temperature thermally conductive adhesive is disposed between the electric furnace and the diamond pad. The structure and distribution of the electric furnace, the diamond pad, and the high-temperature thermally conductive adhesive are symmetrical about the axis of the diamond anvil, which refers to the longitudinal axis and the transverse axis of the diamond anvil.

[0011] In an alternative embodiment, the electric furnace is arranged around the circumference of the diamond anvil, and a heating zone is formed between the electric furnace and the diamond anvil.

[0012] In an alternative embodiment, a gap is formed circumferentially between the electric furnace and the diamond anvil.

[0013] In an alternative embodiment, the electric furnace is located inside the mounting cavity, and both sides of the electric furnace are connected to the inner ends of the diamond pad through high-temperature thermally conductive adhesive.

[0014] In an optional embodiment, a first heat insulation layer is provided on the outside of the electric furnace, where the outside of the electric furnace refers to the side of the electric furnace away from the diamond anvil.

[0015] In an optional embodiment, the first insulation layer includes two sets of insulation members, which form an insulation space for covering the outside of the electric furnace, and a gap is reserved between the two sets of insulation members for the pressurization stroke.

[0016] In an optional embodiment, a second heat insulation layer is provided on the outside of the first heat insulation layer, where the outside of the first heat insulation layer refers to the side of the first heat insulation layer that is away from the high-temperature thermally conductive adhesive and the electric furnace.

[0017] In an optional embodiment, heat insulation sheets are disposed at both ends of the outer side of the diamond pad, an external gap is formed between the two sets of heat insulation sheets, and a third heat insulation layer is disposed in the external gap.

[0018] In an alternative embodiment, a sealed space for mounting a diamond pad is formed between the two sets of heat insulation sheets and the third heat insulation layer.

[0019] Secondly, the heating and temperature measurement method for eliminating the temperature difference between the inside and outside of the diamond anvil sample cavity uses the aforementioned heating and temperature measurement device for eliminating the temperature difference between the inside and outside of the diamond anvil sample cavity. The method includes: controlling the electric furnace to heat to a first temperature, detecting the temperature difference between the inside and outside of the diamond anvil, and if the temperature difference meets the preset requirements, the temperature measurement ends; otherwise, the structural symmetry within the mounting cavity is adjusted.

[0020] The beneficial effects of the embodiments of the present invention are:

[0021] The heating and temperature measurement device and method for eliminating the temperature difference between the inside and outside of the sample cavity of a diamond anvil cell provided in this invention uses a symmetrical structural design to enhance heat transfer through heat conduction and improve the uniformity of the temperature field distribution in the heating area. This can minimize the temperature difference between the inside and outside of the sample cavity, thereby solving the problem of temperature measurement accuracy in DAC external heating technology and significantly improving the DAC heating and temperature measurement capabilities. This is helpful for the development of related engineering projects. In addition, the heating and temperature measurement device and method have versatility and can be widely used in various extreme conditions such as high-pressure physics research and geophysics research. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the heating and temperature measuring device provided in an embodiment of the present invention;

[0024] Figure 2 This is a temperature calibration curve of the heating and temperature measuring device provided in an embodiment of the present invention after heating and testing;

[0025] Figure 3 A schematic diagram of the structure of an existing heating device;

[0026] Figure 4 Photomicrographs of existing heating devices;

[0027] Figure 5 Temperature calibration curves after heating tests of existing technology.

[0028] Icons: 1-Diamond pad; 2-Insulation sheet; 3-High temperature thermal conductive adhesive; 4-Electric furnace; A-Second insulation layer; B-Third insulation layer; C-First insulation layer. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] Furthermore, the terms "parallel" and "perpendicular" do not imply that components must be absolutely parallel or perpendicular, but rather that they can be slightly tilted. For example, "parallel" simply means that its direction is more parallel than "perpendicular," not that the structure must be perfectly parallel, but that it can be slightly tilted.

[0034] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] Example

[0037] Please see Figure 3 In traditional heating devices, the electric furnace is mounted on one end of the base, while the other end leaves a gap of about several millimeters between it and the base to allow for the pressurization stroke. The temperature-measuring thermocouple is mounted on the side of the diamond anvil, and the measured temperature is used as the sample temperature.

[0038] For traditional heating devices, we performed temperature measurement calibration. The calibration technique involved installing multiple R-type thermocouples at different positions on the side of a diamond anvil. Additionally, we fabricated an ultrafine thermocouple using 25μm PtRh / Pt wire and installed it in a sample cavity with a diameter of approximately 100μm and an insulated surface, creating a miniature in-situ temperature measurement structure. This novel device enables in-situ temperature measurement, providing the temperature field distribution of a traditional DAC heating device and clearly defining the temperature difference range inside and outside the sample cavity. Microscopic images of the thermocouple installation are shown below. Figure 4 (The left image is a micrograph of the thermocouple arrangement on the side of the anvil, and the right image is a micrograph of the thermocouples inside the sample cavity.) The measurement and calibration results are as follows: Figure 5 As shown, with Figure 4 In the left image, the temperature measured by the thermocouple furthest from the sample cavity (approximately 2.9 mm) is used as the reference. The temperatures measured by the thermocouples at the other two positions on the anvil side and inside the sample cavity are all lower than the reference thermocouple temperature. When the reference thermocouple temperature reaches 800 K, the sample cavity temperature is 93 K lower.

[0039] The above tests show that the in-situ temperature calibration results of commonly used DAC external heating devices indicate that conventional heating devices cause uneven temperature distribution and a large temperature difference between the inside and outside of the sample cavity. The inventors' research, numerical simulation, and theoretical analysis suggest that the asymmetrical structure of the heating device leads to uneven (asymmetrical) heat distribution reaching the diamond anvil and cavity via heat conduction. This creates an axial temperature gradient from the diamond anvil on the side where the furnace is installed to the opposite anvil, resulting in a large temperature difference between the diamond side and the sample cavity.

[0040] We have optimized the design of traditional external heating devices; please refer to the details. Figure 1This embodiment provides a heating and temperature measurement device for eliminating the temperature difference between the inside and outside of a diamond anvil cell sample chamber. The device includes a diamond pad 1 and an electric furnace 4. The diamond pad 1 forms a mounting cavity for installing the diamond anvil. The electric furnace 4 is mounted on the side of the diamond anvil and generates heat that is transferred to the diamond anvil via the diamond pad 1. A high-temperature thermally conductive adhesive 3 is disposed between the electric furnace 4 and the diamond pad 1. Thus, the diamond pad 1, the high-temperature thermally conductive adhesive 3, and the electric furnace 4 constitute the main body of this optimized heating and temperature measurement device. To ensure that the temperature difference between the inside and outside of the sample chamber is sufficiently small or even eliminated, the structure and distribution of the electric furnace 4, the diamond pad 1, and the high-temperature thermally conductive adhesive 3 are symmetrical about the axis of the diamond anvil, which refers to the longitudinal and transverse axes of the diamond anvil.

[0041] Using the above technical solutions, with the longitudinal axis and transverse axis (any radial axis) of the diamond anvil as the axis of symmetry, the electric furnace 4, diamond pad 1, and high-temperature thermally conductive adhesive 3 are arranged accordingly. This symmetrical structural design can enhance heat transfer through heat conduction and improve the uniformity of the temperature field distribution in the heating area, thereby solving the problem of large temperature difference between the inside and outside of the sample cavity (the side wall of the diamond anvil and the inner wall of the mounting cavity).

[0042] In some embodiments, the electric furnace 4 is annular, surrounding the diamond anvil, and a heating zone is formed between the electric furnace 4 and the diamond anvil to achieve uniform circumferential heating of the diamond anvil. It should be noted that this heating zone can directly contact the high-temperature thermally conductive adhesive 3, thereby transferring heat to the diamond pad 1 and heating the diamond anvil from its end face to the entire structure via the high-temperature thermally conductive adhesive 3. Furthermore, the electric furnace 4 is located within the mounting cavity, and both sides of the electric furnace 4 are connected to the inner ends of the diamond pad 1 via the high-temperature thermally conductive adhesive 3, thus forming a symmetrical heat transfer structure to achieve uniform heating of both sides and the entire diamond anvil. In addition, a gap is formed between the electric furnace 4 and the diamond anvil circumferentially, indicating that the electric furnace 4 and the diamond anvil are not in direct contact (leaving space for installing a metal sealing gasket).

[0043] Through the above technical solutions, the goal of uniform temperature distribution within the mounting cavity is achieved. In traditional heating and temperature measurement devices, the thermal conductivity of the metal gasket and the air or pressure-transmitting medium in the pressure cavity is much lower than that of diamond, resulting in the largest temperature gradient at the gasket and pressure cavity, which also leads to a large temperature difference between the diamond side and the sample cavity. Therefore, the use of high-temperature thermally conductive adhesive 3 can effectively address the problem of temperature gradient formation. However, considering the excellent thermal conductivity of high-temperature thermally conductive adhesive 3, it is necessary to better control heat conduction. In this embodiment, a first heat insulation layer C is provided on the outside of the electric furnace 4. The outside of the electric furnace 4 refers to the side of the electric furnace 4 away from the diamond anvil (including the upper, lower, and outer sides shown in the figure). This allows heat to be directly transferred from the heating area to the diamond pad 1 via the high-temperature thermally conductive adhesive 3, reducing the path of heat conduction from other places and ensuring the effectiveness of heating.

[0044] Based on the above scheme, the first heat insulation layer C includes two sets of heat insulation components. These two sets of heat insulation components form a heat insulation space to cover the outside of the electric furnace 4. That is, the combination of the two sets of heat insulation components covers the outside of the electric furnace 4, with a gap reserved between the two sets of heat insulation components for the pressurization stroke. Furthermore, a second heat insulation layer A is provided on the outside of the first heat insulation layer C. The outside of the first heat insulation layer C refers to the side of the first heat insulation layer C away from the high-temperature thermally conductive adhesive 3 and the electric furnace 4. As can be seen from the above scheme, by arranging a multi-layer heat insulation structure, the heating efficiency can be effectively improved.

[0045] Based on the above scheme, heat insulation sheets 2, such as ZrO2 heat insulation sheets, are arranged at both ends of the outer side (here, the outer side refers to the upper and lower surfaces away from the mounting cavity) of the diamond pad 1. An external gap is formed between the two sets of heat insulation sheets 2, and a third heat insulation layer B is arranged in the external gap to ensure the heat insulation and sealing of the entire diamond pad 1. Specifically, a sealed space for installing the diamond pad 1 is formed between the two sets of heat insulation sheets 2 and the third heat insulation layer B. This sealed space has a good heat insulation effect. The first heat insulation layer C, the second heat insulation layer A, and the third heat insulation layer B are, for example, aluminum silicate fiber heat insulation layers, which can effectively reduce the heat dissipation of the heating and temperature measuring device.

[0046] Compared to traditional heating devices, in this heating and temperature measurement device, the electric furnace 4 and the diamond pads 1 at both ends are symmetrically in contact through high-temperature thermally conductive adhesive 3, allowing the heat generated by the electric furnace 4 to be symmetrically transferred to the diamond anvil through the diamond pads 1. To verify the effect of the optimized design, we conducted multiple rounds of testing and calibration using in-situ thermocouple temperature measurements and international temperature scale materials Sn (melting point 505.036K) and Al (melting point 933.473K). The test results are as follows: Figure 2As shown, within a heating range of approximately 1000K, the temperature difference between the inside and outside of the sample chamber is ≤3K. Simultaneously, the internal insulation of the heating press utilizes longitudinal double-layer solid insulation and radial multi-layer insulation to reduce heat loss through conduction and radiation, thereby improving heating efficiency and reducing heating power consumption by approximately 20% at a high temperature of around 1000K.

[0047] This embodiment also provides a heating and temperature measurement method for eliminating the temperature difference between the inside and outside of the diamond anvil cell sample cavity. Using the above-mentioned heating and temperature measurement device for eliminating the temperature difference between the inside and outside of the diamond anvil cell sample cavity, the method includes: controlling the electric furnace 4 to heat to a first temperature, such as 1000K, detecting the temperature difference between the inside and outside of the diamond anvil (the temperature difference between the outer wall of the diamond anvil and the temperature difference between the inner wall of the mounting cavity), if the temperature difference meets the preset requirements, the temperature measurement ends; otherwise, continue to adjust the symmetry of the structure in the mounting cavity (such as the installation symmetry of the diamond pad 1, the heat insulation sheet 2, the high-temperature thermally conductive adhesive 3 and the electric furnace 4; if necessary, the symmetry of the second heat insulation layer A, the third heat insulation layer B and the first heat insulation layer C can also be adjusted to ensure that the temperature difference between the inside and outside is controlled within 3K).

[0048] In summary, the heating and temperature measurement device and method for eliminating the temperature difference between the inside and outside of the sample chamber of a diamond anvil cell provided in this embodiment have the following main technical innovations and achievements:

[0049] (1) The temperature field distribution of a conventional DAC external heating device was obtained by an in-situ measurement method;

[0050] (2) A new heating device design is proposed, which improves temperature uniformity and can achieve a temperature difference of ≤3K between the inside and outside of the sample chamber within a heating range of about 1000K.

[0051] (3) The heating press adopts a radial and longitudinal multi-layer internal heat insulation design, which improves the heating efficiency and reduces the heating power consumption by about 20% at a high temperature of about 1000K.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of protection of the invention. It should be noted that the structures or components illustrated in the accompanying drawings are not necessarily drawn to scale, and descriptions of well-known components, processing techniques, and processes have been omitted to avoid unnecessarily limiting the invention.

Claims

1. A heating and temperature measuring device for eliminating the temperature difference between the inside and outside of a sample cavity of a diamond anvil cell, characterized in that, The application relates to a heating and temperature measuring device for eliminating temperature difference between inside and outside of a diamond anvil cell sample chamber, which comprises a diamond pad and an electric furnace, the diamond pad forms a mounting cavity for mounting a diamond anvil, the electric furnace is arranged on the side of the diamond anvil and generates heat through the diamond pad into the diamond anvil, high-temperature heat-conducting glue is arranged between the electric furnace and the diamond pad, a first heat insulation layer is arranged on the outside of the electric furnace, the outside of the electric furnace refers to the side of the electric furnace far away from the diamond anvil. The structure and distribution of the electric furnace, the diamond pad and the high-temperature heat-conducting glue are symmetrical about the axis of the diamond anvil, the axis refers to the longitudinal axis and the transverse axis of the diamond anvil. The electric furnace is arranged around the circumference of the diamond anvil to form a gap between the circumference of the electric furnace and the circumference of the diamond anvil, and a heating area is formed between the electric furnace and the diamond anvil.

2. The heating and temperature measurement apparatus for canceling the temperature difference between the inside and the outside of the sample chamber of the diamond anvil cell according to claim 1, characterized by, The electric furnace is arranged in the mounting cavity, and the high-temperature heat-conducting glue is arranged between the two ends of the inner side of the diamond pad on both sides of the electric furnace.

3. The heating and temperature measurement apparatus for canceling the temperature difference between the inside and outside of the sample chamber of the diamond anvil cell according to claim 1, characterized by, The first heat insulation layer comprises two groups of heat insulation pieces, the two groups of heat insulation pieces form a heat insulation space for covering the outside of the electric furnace, and a gap for pressure stroke is reserved between the two groups of heat insulation pieces.

4. The heating and temperature measurement apparatus for canceling the temperature difference between the inside and outside of the sample chamber of the diamond anvil cell according to claim 1, characterized by, A second heat insulation layer is arranged on the outside of the first heat insulation layer, the outside of the first heat insulation layer refers to the side of the first heat insulation layer far away from the high-temperature heat-conducting glue and the electric furnace.

5. The heating and temperature measuring apparatus for eliminating the temperature difference between the inside and outside of the sample chamber of the diamond anvil cell according to claim 1 or 4, characterized by, Heat insulation sheets are arranged on the two ends of the outside of the diamond pad, an external gap is formed between the two groups of heat insulation sheets, and a third heat insulation layer is arranged in the external gap.

6. The heating and temperature measurement apparatus for canceling the temperature difference between the inside and outside of the sample chamber of the diamond anvil cell according to claim 5, wherein A sealing space for mounting the diamond pad is formed between the two groups of heat insulation sheets and the third heat insulation layer.

7. The method of heating and measuring the temperature of a sample in a diamond anvil cell chamber, characterized in that, The application relates to a heating and temperature measuring device for eliminating temperature difference between inside and outside of a diamond anvil cell sample chamber, which comprises a diamond pad and an electric furnace, the diamond pad forms a mounting cavity for mounting a diamond anvil, the electric furnace is arranged on the side of the diamond anvil and generates heat through the diamond pad into the diamond anvil, high-temperature heat-conducting glue is arranged between the electric furnace and the diamond pad, a first heat insulation layer is arranged on the outside of the electric furnace, the outside of the electric furnace refers to the side of the electric furnace far away from the diamond anvil. The structure and distribution of the electric furnace, the diamond pad and the high-temperature heat-conducting glue are symmetrical about the axis of the diamond anvil, the axis refers to the longitudinal axis and the transverse axis of the diamond anvil. The electric furnace is arranged around the circumference of the diamond anvil to form a gap between the circumference of the electric furnace and the circumference of the diamond anvil, and a heating area is formed between the electric furnace and the diamond anvil. The electric furnace is arranged in the mounting cavity, and the high-temperature heat-conducting glue is arranged between the two ends of the inner side of the diamond pad on both sides of the electric furnace. The first heat insulation layer comprises two groups of heat insulation pieces, the two groups of heat insulation pieces form a heat insulation space for covering the outside of the electric furnace, and a gap for pressure stroke is reserved between the two groups of heat insulation pieces. A second heat insulation layer is arranged on the outside of the first heat insulation layer, the outside of the first heat insulation layer refers to the side of the first heat insulation layer far away from the high-temperature heat-conducting glue and the electric furnace. Heat insulation sheets are arranged on the two ends of the outside of the diamond pad, an external gap is formed between the two groups of heat insulation sheets, and a third heat insulation layer is arranged in the external gap. A sealing space for mounting the diamond pad is formed between the two groups of heat insulation sheets and the third heat insulation layer. The application relates to a heating and temperature measuring device for eliminating temperature difference between inside and outside of a diamond anvil cell sample chamber, which comprises a diamond pad and an electric furnace, the diamond pad forms a mounting cavity for mounting a diamond anvil, the electric furnace is arranged on the side of the diamond anvil and generates heat through the diamond pad into the diamond anvil, high-temperature heat-conducting glue is arranged between the electric furnace and the diamond pad, a first heat insulation layer is arranged on the outside of the electric furnace, the outside of the electric furnace refers to the side of the electric furnace far away from the diamond anvil. The structure and distribution of the electric furnace, the diamond pad and the high-temperature heat-conducting glue are symmetrical about the axis of the diamond anvil, the axis refers to the longitudinal axis and the transverse axis of the diamond anvil. The electric furnace is arranged around the circumference of the diamond anvil to form a gap between the circumference of the electric furnace and the circumference of the diamond anvil, and a heating area is formed between the electric furnace and the diamond anvil. The electric furnace is arranged in the mounting cavity, and the high-temperature heat-conducting glue is arranged between the two ends of the inner side of the diamond pad on both sides of the electric furnace. The first heat insulation layer comprises two groups of heat insulation pieces, the two groups of heat insulation pieces form a heat insulation space for covering the outside of the electric furnace, and a gap for pressure stroke is reserved between the two groups of heat insulation pieces. A second heat insulation layer is arranged on the outside of the first heat insulation layer, the outside of the first heat insulation layer refers to the side of the first heat insulation layer far away from the high-temperature heat-conducting glue and the electric furnace. Heat insulation sheets are arranged on the two ends of the outside of the diamond pad, an external gap is formed between the two groups of heat insulation sheets, and a third heat insulation layer is arranged in the external gap. A sealing space for mounting the diamond pad is formed between the two groups of heat insulation sheets and the third heat insulation layer. The application relates to a heating and temperature measuring device for eliminating temperature difference between inside and outside of a diamond anvil cell sample chamber, which comprises a diamond pad and an electric furnace, the diamond pad forms a mounting cavity for mounting a diamond anvil, the electric furnace is arranged on the side of the diamond anvil and generates heat through the diamond pad into the diamond anvil, high-temperature heat-conducting glue is arranged between the electric furnace and the diamond pad, a first heat insulation layer is arranged on the outside of the electric furnace, the outside of the electric furnace refers to the side of the electric furnace far away from the diamond anvil. The structure and distribution of the electric furnace, the diamond pad and the high-temperature heat-conducting glue are symmetrical about the axis of the diamond anvil, the axis refers to the longitudinal axis and the transverse axis of the diamond anvil. The electric furnace is arranged around the circumference of the diamond anvil to form a gap between the circumference of the electric furnace and the circumference of the diamond anvil, and a heating area is formed between the electric furnace and the diamond anvil. The electric furnace is arranged in the mounting cavity, and the high-temperature heat-conducting glue is arranged between the two ends of the inner side of the diamond pad on both sides of the electric furnace. The first heat insulation layer comprises two groups of heat insulation pieces, the two groups of heat insulation pieces form a heat insulation space for covering the outside of the electric furnace, and a gap for pressure stroke is reserved between the two groups of heat insulation pieces. A second heat insulation layer is arranged on the outside of the first heat insulation layer, the outside of the first heat insulation layer refers to the side of the first heat insulation layer far away from the high-temperature heat-conducting glue and the electric furnace. Heat insulation sheets are arranged on the two ends of the outside of the diamond pad, an external gap is formed between the two groups of heat insulation sheets, and a third heat insulation layer is arranged in the external gap. A sealing space for mounting the diamond pad is formed between the two groups of heat insulation sheets and the third heat insulation layer. The application relates to a heating and temperature measuring device for eliminating temperature difference between inside and outside of a diamond anvil cell sample chamber, which comprises a diamond pad and an electric furnace, the diamond pad forms a mounting cavity for mounting a diamond anvil, the electric furnace is arranged on the side of the diamond anvil and generates heat through the diamond pad into the diamond anvil, high-temperature heat-conducting glue is arranged between the electric furnace and the diamond pad, a first heat insulation layer is arranged on the outside of the electric furnace, the outside of the electric furnace refers to the side of the electric furnace far away from the diamond anvil. The structure and distribution of the electric furnace, the diamond pad and the high-temperature heat-conducting glue are symmetrical about the axis of the diamond anvil, the axis refers to the longitudinal axis and the transverse axis of the diamond anvil. The electric furnace is arranged around the circumference of the diamond anvil to form a gap between the circumference of the electric furnace and the circumference of the diamond anvil, and a heating area is formed between the electric furnace and the diamond anvil. The electric furnace is arranged in the mounting cavity, and the high-temperature heat-conducting glue is arranged

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