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Diamond anvil cell sample temperature measuring method

A technology of diamond anvil and measurement method, which is applied in thermometers, measuring devices, measuring heat, etc., can solve the problems of unfavorable arrangement of thermocouples and small size, and achieve the effects of easy implementation, simple method and good experimental repeatability

Active Publication Date: 2018-06-19
JILIN UNIV
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  • Abstract
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Problems solved by technology

[0007] Compared with the background technology, the present invention does not repair the contact temperature measurement method, but proposes a brand-new sample temperature measurement method, combining the temperature value of the temperature measurement point with finite element analysis to obtain an accurate sample temperature, which not only solves the problem caused by The size of the sample chamber of the diamond anvil is small, and the thermocouple is not conducive to the arrangement. At the same time, it makes up for the error caused by using the temperature of the side edge of the diamond anvil instead of the sample temperature.

Method used

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Examples

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Embodiment 1

[0026] Embodiment 1 is combined with attached figure 1 The device structure and assembly of the present invention will be described.

[0027] figure 1Among them, 1 is the upper diamond anvil, 2 is the lower diamond anvil, 5 is the thermocouple on the upper side, 6 is the thermocouple on the upper bottom, 7 is the thermocouple on the lower side, and 8 is the thermocouple on the lower bottom. The temperature measuring points of the thermocouples can be fixed sequentially at the center of the bottom surface of the two diamond anvils and 1 / 2 of the side edges of the diamond anvils by using silver paste. The four thermocouples are K-type thermocouples with a diameter of 100 μm. The cold ends of the thermocouples are connected to the Keithley2700 data acquisition instrument. The temperature of the 4 temperature measuring points at the center and 1 / 2 of the side edge are measured simultaneously. The anvil surface of the upper diamond anvil 1 and the anvil surface of the lower diam...

Embodiment 2

[0034] Embodiment 2 combines attached figure 2 , 3 , 4 Explain the measurement principle of the sample temperature.

[0035] figure 2 , 3 In the experiment, through the thermocouples (upper bottom thermocouple 6, lower bottom thermocouple 8, upper edge thermocouple 5, lower Edge thermocouple 7) read the temperature value t of the corresponding temperature measuring point respectively 1 , t 2 , t 3 , t 4 , the center temperature t of the bottom surface of the upper and lower diamond anvils 1 , t 2 and the input temperature t′ of the upper and lower diamond anvil surfaces 1 , t' 2 Input the thermal boundary conditions into the two finite element models respectively, because the thermal conductivity of the diamond anvil and the gasket 3 are known, and the temperature of the bottom surface of the diamond anvil is known, so only the temperature of the diamond anvil surface needs to be input. To obtain the overall temperature distribution of the diamond anvil, at this t...

Embodiment 3

[0036] Example 3 The example 1 of using the finite element software to realize the temperature measurement of the sample in the anvil by the diamond.

[0037] As the finite element software, well-known ANSYS software was used. According to the geometric dimensions of the upper and lower diamond anvils 1 and 2, the diameter of the bottom surface is 3 mm, the diameter of the anvil surface is 400 μm, and the height is 2.3 mm to construct two finite element models.

[0038] As in the device structure given in Example 1, the thermal conductivity of the upper and lower diamond anvils 1 and 2 is 1500 W / m·K. The gasket 3 is made of T301 steel sheet, the thermal conductivity corresponds to 17W / m·K, the diameter of the gasket 3 is 6mm, and the thickness is 0.25mm, and the sample 4 of potassium chloride material is placed in the sample cavity formed by pre-pressing and punching. The thermal conductivity of sample 4 is 10 W / m·K, the thickness of sample 4 is 50 μm, and the diameter of sam...

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Abstract

The invention provides a diamond anvil cell sample temperature measuring method, and belongs to the technical field of temperature measurement under high temperature and high pressure. Firstly diamondanvil cells are assembled; thermocouples are arranged on the designated positions of the bottom surface and the side edges of two diamond anvil cells to read the temperature of the corresponding points; and then fitting calculation of the temperature gradient is performed: a finite element model is established according to the real experimental size, the bottom surface temperature of the diamondanvil cells measured by the experiment acts as the thermal boundary condition to be inputted to the finite element model, the anvil face input temperature of the two diamond anvil cells is changed until the simulation temperature of the temperature measuring points of the side edges if fit with the temperature read by the experiment, and then the anvil face input temperature of the diamond anvil cells is the real experimental temperature and is also the sample surface temperature. The method is simple, easy to implement and great in experimental repetition so that the problem that the thermocouples cannot be conveniently arranged because of the small size of the sample chamber can be solved; and the experimental error caused by substituting the sample temperature by the side edge temperature of the diamond anvil cells can be compensated.

Description

technical field [0001] The invention belongs to the technical field of sample temperature measurement under high temperature and high pressure, and in particular relates to a device and method for sample temperature measurement of thermal conductivity and Seebeck coefficient, which are heat transport properties of the sample itself with temperature gradient. Background technique [0002] Diamond Anvil Cell (DAC for short) is currently the only scientific device that can generate a static pressure of one million atmospheres, and is the most important scientific instrument in the field of high-pressure science and technology research. Using a special diamond anvil, the known pressure upper limit has exceeded 1TPa. If combined with high-temperature technology, the temperature and pressure environment simulated in the laboratory can completely study the physical and chemical properties of earth-related substances. It is important to interpret seismic wave data and understand the ...

Claims

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Application Information

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IPC IPC(8): G01K7/02G06F17/50
CPCG01K7/02G06F30/23
Inventor 高春晓冀婷婷岳冬辉韩永昊彭刚刘才龙张国召
Owner JILIN UNIV
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