Effect of thermal annealing on structural, electrical and thermoelectric properties of p-type Bi0.5Sb1.5Te3

DAE SOLID STATE PHYSICS SYMPOSIUM 2018 Pub Date : 2019-07-12 DOI:10.1063/1.5113165

M. Bala, S. Annapoorni, K. Asokan

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引用次数: 3

Abstract

The present study reports the effect of annealing on the phase, structure and thermoelectric properties of Bi0.5Sb1.5Te3 prepared by melt quenching method. The extracted ingots were pelletized followed by annealing at 400°C. Microstructure of the as-extracted pellets contained Te-rich inclusions which disappeared on annealing due to Te sublimation. The Seebeck coefficient enhanced about two times on annealing due to significant increase in hole mobility. The combination of melt quenching followed by annealing is one of the effective ways to synthesize the high-performance BiSbTe-based materials.The present study reports the effect of annealing on the phase, structure and thermoelectric properties of Bi0.5Sb1.5Te3 prepared by melt quenching method. The extracted ingots were pelletized followed by annealing at 400°C. Microstructure of the as-extracted pellets contained Te-rich inclusions which disappeared on annealing due to Te sublimation. The Seebeck coefficient enhanced about two times on annealing due to significant increase in hole mobility. The combination of melt quenching followed by annealing is one of the effective ways to synthesize the high-performance BiSbTe-based materials.

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热处理对p型Bi0.5Sb1.5Te3结构、电学和热电性能的影响

本研究报道了退火对熔体淬火法制备Bi0.5Sb1.5Te3的相、组织和热电性能的影响。将提取的钢锭制成球团，然后在400℃下退火。萃取球团的微观结构中含有富Te夹杂物，这些夹杂物在退火过程中由于Te的升华而消失。由于空穴迁移率的显著提高，Seebeck系数在退火过程中提高了约2倍。熔体淬火与退火相结合是合成高性能铋基材料的有效方法之一。本研究报道了退火对熔体淬火法制备Bi0.5Sb1.5Te3的相、组织和热电性能的影响。将提取的钢锭制成球团，然后在400℃下退火。萃取球团的微观结构中含有富Te夹杂物，这些夹杂物在退火过程中由于Te的升华而消失。由于空穴迁移率的显著提高，Seebeck系数在退火过程中提高了约2倍。熔体淬火与退火相结合是合成高性能铋基材料的有效方法之一。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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DAE SOLID STATE PHYSICS SYMPOSIUM 2018

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