13 results about "Bridgman method" patented technology

The invention discloses a Bridgman method growth gallium oxide single crystal abnormity detection method based on multi-mode perception, and relates to the technical field of single crystal preparation, and the method comprises the following steps: S1, collecting optical signals of a melt surface area in a Bridgman method growth gallium oxide single crystal process through a sensor array, synchronously acquiring temperature field data or infrared thermal image data of the region; the method comprises the following steps: acquiring an original spectral data set covering a local area according to a radiation signal under a micron-order spatial resolution, and obtaining initial radiation distribution information; according to the anomaly detection method for growing the gallium oxide single crystal by the Bridgman method based on multi-mode perception, dynamic tracking and accurate positioning of component anomaly in the growth process of the Bridgman method are realized, and an effective technical means is provided for improving the growth quality of the gallium oxide single crystal, reducing crystal defects and improving the process control capability.

The invention provides a double-layer crucible. The double-layer crucible comprises an outer circular tube-shaped container, an inner circular tube-shaped container and a T-shaped cylindrical plug, the double-layer structure can solve the problems of raw material loss and proportion imbalance caused in the process of filling the raw materials into the crucible, and the perovskite crystal which can be used for normal-temperature nuclear radiation detection can be industrially prepared by using the Bridgman method in an economic mode. And a vacuum cavity can be provided as a temperature buffer area, so that the thermal disturbance of a crystal growth interface is reduced. The method can also be used for atmosphere regulation and control, and component segregation caused by element volatilization is relieved. The invention also provides a method for preparing a perovskite polycrystal material and a method for preparing a perovskite single crystal.

The application discloses a gallium oxide crystal growth device and method by the vertical Bridgman method. The gallium oxide crystal growth device comprises a furnace body, a heater and a lifting assembly. A graphite lining cavity assembly and a corundum cavity assembly are arranged in the furnace body to separate the furnace body into three independent cavities, i.e. a crystal growth cavity, a protection cavity and a heating cavity. A platinum-rhodium crucible is arranged in the crystal growth cavity. The heater is arranged in the heating cavity. The preset gas is introduced into the three cavities, and the pressure in the protection cavity is lower than that in the crystal growth cavity and the heating cavity. By controlling the atmosphere type and pressure difference of each cavity, the carbon dioxide and oxygen generated at high temperature in the crystal growth cavity are prevented from escaping outward to corrode the heater, and the reverse diffusion of the external impurity gas into the crystal growth cavity to pollute the gallium oxide crystal is avoided. The crystal growth device can protect the heater, prolong the service life of the device, and significantly improve the purity and quality of the crystal.

This invention relates to a series of alkali metal rare earth chalcogenides and a series of alkali metal rare earth chalcogenide nonlinear optical crystals, their preparation methods, and their applications. The general chemical formula for both the series of halides and the nonlinear optical crystals is A3Ln. 11 Ga 19 Q 45 X3, where A = K, Rb, Cs; Ln = La, Pr, Nd; Q = S, Se; X = Cl, Br, I, all belong to the hexagonal crystal system with space group and cell parameter Z = 1. This series of halides is synthesized using a high-temperature solid-state method, while this series of nonlinear optical crystals is grown using a high-temperature solution method or the Bridgman process. This material can be used to manufacture second harmonic generators, up- and down-frequency converters, optical parametric oscillators, etc.

The application provides a single crystal ZrCoSb semi-Hassler alloy and a preparation method and application thereof, and belongs to the technical field of alloys. The preparation method comprises the following steps: (1) alloy raw materials are subjected to smelting to obtain a polycrystal ZrCoSb ingot; (2) the polycrystal ZrCoSb ingot obtained in the step (1) is subjected to crystal growth through a Bridgman method to obtain a single crystal ZrCoSb semi-Hassler alloy; and the pulling rate during the crystal growth is 0.5-2 mm / h. According to the application, the polycrystal ingot is first obtained through smelting, then the crystal growth is carried out through the Bridgman method, the pulling rate in the growth process is controlled, and a large-size single crystal ZrCoSb semi-Hassler alloy is slowly grown by using a temperature gradient.

The invention discloses a high-performance bismuth telluride-based thermoelectric material and a preparation method thereof, the chemical formula of the bismuth telluride-based thermoelectric material is XaBi2-xSbxTe3 + y, X is a doped transition metal element, a is more than 0 and less than or equal to 0.1, x is more than or equal to 0 and less than or equal to 1, and y is more than or equal to 0 and less than or equal to 1; the preparation method comprises the following steps: respectively weighing bismuth, antimony, tellurium and X metal simple substance particle raw materials, and sequentially mixing and sintering to obtain a polycrystalline cast ingot; and growing crystals on the cast ingot by adopting a Bridgman method under a certain process condition, and finally performing hot extrusion to obtain the P-type bismuth telluride-based thermoelectric material. The thermoelectric material prepared by the method has excellent thermoelectric performance and mechanical performance.

The invention relates to the field of thermoelectric materials and semiconductor refrigeration, and discloses a thermoelectric refrigeration material based on a P-type diamond-like carbon-based Cu3SbSe4 crystal and a preparation method of the thermoelectric refrigeration material, the material is an Ag solid solution P-type Cu3SbSe4 crystal material, and the molar ratio of Cu to Ag to Sb to Se is (3-x): x: 1: 4; wherein x is more than or equal to 0.03 and less than or equal to 0.24, and a Bridgman method is adopted. The compact Cu3SbSe4 crystal material is successfully prepared by a method of firstly adjusting a slow cooling temperature zone by optimizing a preparation process and then filling nitrogen to adjust pressure. And the crystal quality and mobility are improved through solid solution Ag, meanwhile, the carrier concentration of the material is maintained, and finally the electrical transport performance of the material is optimized. The P-type Cu3SbSe4 crystal provided by the invention has the advantages of rich source materials, low price, high mechanical strength and the like, a thermoelectric refrigeration device constructed by the P-type Cu3SbSe4 crystal realizes an effective refrigeration effect, and the diamond-like thermoelectric material Cu3SbSe4 has a great potential of becoming a thermoelectric refrigeration material.

This application discloses a doped zinc germanate crystal, its preparation method, and its application. The molecular formula of the doped zinc germanate crystal is Zn. 2‑x GeO4:xMn, where Mn is divalent manganese with a valence of 0 ≤ x ≤ 0.5, is a series of crystals prepared as polycrystalline powders using a high-temperature solid-state method. Large crystals are grown using methods such as the Bridgman process, molten salt method, and Czochralski method, but not limited to these methods. This series of crystals exhibits steady-state luminescence characteristics, high light output, excellent radiation stability, and a low detection limit. Furthermore, due to the stable structure of the crystals, they can achieve long-term stable operation under X-ray irradiation. They can be used in many fields such as flawless inspection of electronic components, radiation imaging, and security inspection.

The invention discloses a thermal field structure for vertical Bridgman method crystal growth and a growth method, and relates to the technical field of crystal growth. Comprising a furnace body, the top wall of the furnace body is provided with a pressure relief hole, and the side wall of the furnace body is provided with infrared temperature measurement windows which are symmetrically distributed and provided with air supply ports; the heat preservation cavity is formed in the furnace body, a gap exists between the heat preservation cavity and the inner wall of the furnace body, and a first hole channel is formed in the heat preservation top wall of the heat preservation cavity; the heat preservation side wall of the heat preservation cavity comprises a bottom side wall and a flow guide layer which are stacked from bottom to top, and second hole channels which are symmetrically distributed and are arranged on the same straight line with the infrared temperature measurement window are formed in the bottom side wall; a third hole channel is formed between the bottom side wall and the bottom of the furnace body, and symmetrically-distributed flow guide holes are formed in the flow guide layer. The silicon molybdenum rods are vertically arranged in the heat preservation cavity and evenly installed on the heat preservation top wall in an annular array mode. When the thermal field structure is used for growth of oxide crystals, volatile matters can be prevented from being deposited on the infrared temperature measurement window, and the stability of the thermal field can be ensured.

The invention discloses a mid-infrared three-wavelength laser crystal material and a preparation method and application thereof, and belongs to the field of inorganic functional crystal materials. The chemical formula of the intermediate infrared three-wavelength laser crystal material is KDyYGdF10. And the crystal is grown by adopting a Bridgman method. The laser crystal material has ultra-wide-band absorption and emission performance, can realize light emission in the middle-infrared band of 2500-3300 nm and the middle-infrared band of 4100-4400 nm under pumping of 1277 nm, and has peak wavelengths of 2849 nm, 4235 nm and 4273 nm respectively. The laser crystal material has the characteristics of low phonon energy, low melting point, same-component melting and the like, the absorption wavelength of the laser crystal material is matched with that of a commercial Nd: YAG laser pumping source, the absorption peak intensity is high, the absorption of pump light by the crystal is facilitated, so that fluorescence emission with peak wavelengths of 2849 nm, 4235 nm and 4273 nm in a middle-infrared band is realized, and the laser crystal material is a middle-infrared laser crystal material with great application potential.

This invention discloses a large-size, high-quality magnetic Weyl half-metal Co3Sn2S2 single crystal and its preparation method. The single crystal has a diameter greater than 1 cm and a length greater than 5 cm, exhibiting high quality, a complete and crack-free appearance, and a smooth surface. X-ray rocking curve analysis confirmed its high quality. l The full width at half maximum (FWHM) of the diffraction peaks is only 0.02°. Furthermore, this crystal exhibits ferromagnetism and a Curie temperature of [missing value]. T c =174 K, exhibiting a significant anomalous Hall effect: the maximum anomalous Hall conductivity is approximately 1250 S / cm, and the anomalous Hall angle is 25%. The preparation method includes controlling the molar ratio of raw materials to synthesize polycrystalline raw materials through a high-temperature solid-state reaction; further, using a modified Bridgman process, optimizing the temperature gradient, controlling the growth rate, rotation rate, and vacuum sealing environment, ultimately preparing a Co3Sn2S2 single crystal. The Co3Sn2S2 single crystal of this invention can be used in novel low-power spintronic devices, topological thermoelectric devices, etc., providing a key material foundation for the practical research of magnetic Weyl half-metals.

The invention relates to the field of II-VI group compound semiconductor material preparation, and discloses a preparation method of a polycompound semiconductor crystal, the polycompound semiconductor crystal is a selenium tellurium magnesium cadmium crystal, the chemical formula is Cd < 0.95 > Mg < 0.05 > Te < 1-x > Se < x >, the preparation method sequentially comprises the following steps: synthesizing a selenium tellurium magnesium cadmium polycrystal material by a high-temperature melting method, carrying out crystal growth by a vertical Bridgman method, and carrying out in-situ annealing treatment. The preparation raw materials comprise basic raw materials of Cd, Mg, Te and Se which are proportioned according to the stoichiometric ratio of Cd0. 95Mg0. 05Te1-xSex, excessive Te is added on the basis of the basic raw materials, and the In element is doped. The selenium tellurium magnesium cadmium single crystal is grown by adopting a three-temperature-zone crystal growth furnace in combination with a vertical Bridgman method, so that the temperature gradient can be accurately regulated and controlled, a smoother solid-liquid interface can be formed, the generation of defects such as dislocation, twin crystal and inclusion in the crystal is effectively reduced, meanwhile, the thermal stress in the crystal growth process is reduced, and the crystal quality is improved. The mechanical stability of the crystal is improved.

The invention discloses an intermediate infrared laser crystal material and a preparation method and application thereof, and belongs to the field of inorganic optical function crystal materials. The chemical formula of the intermediate infrared laser crystal material is KHoLuGdF10. And the crystal is grown by adopting a gradient-variable Bridgman method. The crystal is an excellent laser host crystal, 451 nm pumping is adopted, ultra-wideband fluorescence emission is generated in the wave band of 3850-4150 nm, the peak wavelength is 3980 nm, and the laser crystal material can be used for generating broadband mid-infrared laser.