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Anisotropic Large Size Crystals and agcrse 2 the preparation method of

An anisotropic, large-size technology, applied in the field of preparation of anisotropic large-size crystals and AgCrSe2

Active Publication Date: 2022-07-12
TAIZHOU RES INST OF SOUTHERN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the origin of the extremely low lattice thermal conductivity is controversial. Some studies support that it comes from disorder, and some support that the propagation of the acoustic branch of the shear wave is caused by the suppression of ion diffusion. Analytical interpretation of particle scattering and ultrafast transmission electron microscopy

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  • Anisotropic Large Size Crystals and agcrse <sub>2</sub> the preparation method of
  • Anisotropic Large Size Crystals and agcrse <sub>2</sub> the preparation method of
  • Anisotropic Large Size Crystals and agcrse <sub>2</sub> the preparation method of

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Embodiment 1

[0070] The synthesized AgCrSe 2 Polycrystalline powder 1g and 8mg transmission medium CrCl 3 Mix and vacuum to 10 -4 Pa was sealed and put into a double-temperature zone tube furnace, and crystal growth was carried out according to the improved gas-phase transport method. The temperature of the high temperature section is set to 1123K, and the low temperature section is set to 1103K. After 5 hours, the temperature is raised to the target temperature. Then, the low temperature zone is kept at a constant temperature, and the high temperature zone is subjected to temperature oscillation to adjust the saturated vapor pressure. First hold at 1123K for 7 hours, then heat up to 1143K for 1 hour and hold for 20 hours, then cool down to 1123K for 7 hours after 1 hour, cycle and shake for 8 times, and finally cool down to 373K after 17 hours, turn off the power and cool to room temperature with the furnace, the crystal grows Finish. heating programs such as Figure 5 shown, the resu...

Embodiment 2

[0072] The synthesized AgCrSe 2 Polycrystalline powder 1g and 8mg transmission medium CrCl 3 (7mg)+I 2 (1mg) mixed and evacuated to 10 - 4 Pa is sealed and placed in a double-temperature zone tube furnace, and crystal growth is carried out according to the further improved gas-phase transport method. The temperature of the high temperature section is set to 1138K, and the low temperature section is set to 1123K. After 5 hours, the temperature is raised to the target temperature, and then the low temperature zone is kept at a constant temperature, and the high temperature zone is subjected to temperature oscillation. First hold at 1138K for 7h, then heat up to 1173K for 0.5h and hold for 10h, then cool down to 1138K for 1 hour after 0.5h, then heat up to 1173K for 0.5h and hold for 11 hours. Increase the time by 10% and cycle 10 times. Finally, the temperature was lowered to 373K after 17 hours, the power was turned off, and the furnace was cooled to room temperature, and ...

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Abstract

The invention discloses anisotropic large size crystal and AgCrSe 2 preparation method. Preparation of large-scale AgCrSe with anisotropy 2 The method of crystallizing includes: (1) AgCrSe 2 The polycrystalline powder and the transmission medium are mixed, and the mixture is placed in a sealable container for vacuuming and sealing; (2) the sealed container is placed in a horizontal dual-temperature zone heating environment and heated, so that the container contains the mixture. One side is located in the high temperature area, and the heating process adopts an oscillating heating temperature curve, and the heating time is 5 to 15 days. This method can not only improve AgCrSe 2 The size, thickness and quality of the crystal can obtain large-sized crystals with anisotropy, and it is also beneficial to obtain high thermoelectric transport properties in special directions. AgCrSe 2 crystalline material.

Description

technical field [0001] The invention belongs to the field of materials, in particular, relates to anisotropic large-size crystals and AgCrSe 2 preparation method. Background technique [0002] Thermoelectric material is an environmentally friendly "green" energy conversion material that can realize the direct mutual conversion of thermal energy and electrical energy. The limitation of traditional fossil energy utilization is of great significance. [0003] The performance of thermoelectric materials is generally determined by the dimensionless thermoelectric figure of merit zT=S 2 σT / κ, where S is the Seebeck coefficient, σ is the electrical conductivity, κ is the thermal conductivity, and T is the absolute temperature. High-performance thermoelectric materials require high Seebeck coefficients, high electrical conductivity, and low thermal conductivity. AgCrSe 2 It is a kind of superionic conductor material with typical intercalation structure characteristics, at the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/46C30B23/00C30B28/02
CPCC30B29/46C30B23/00C30B28/02
Inventor 何佳清王江舵冯江河
Owner TAIZHOU RES INST OF SOUTHERN UNIV OF SCI & TECH