Formation mechanism of twin structures in p-type (Bi0.25Sb0.75)2Te3 thermoelectric compound
Formation mechanism of twin structures in p-type (Bi0.25Sb0.75)2Te3 thermoelectric compound
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DOI：
10.1016/j.scriptamat.2018.12.006
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发表时间：
2019-03-15
影响因子：
6
通讯作者：
Hong, Soon-Jik
中科院分区：
文献类型：
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作者：
Lee, Kap Ho;Dharmaiah, Peyala;Hong, Soon-Jik
利用高分辨透射电子显微镜（HR-TEM）和计算机模拟研究了p型（Bi 0.25Sb 0.75）（2）Te-3化合物中孪晶结构的形成机制。结果表明，孪晶的形成类似于面心立方（FCC）金属中常见的通过Shockley部分位错的同步激活终止{111}生长和退火孪晶的孪晶机制。作为非共格孪晶晶界（ITB）的{10（1）over bar 0}晶界由于其与共格{0001}孪晶晶界的剪切应力相比更低的剪切应力而是移动的;孪晶区的厚度可以根据移动的方向而减小或增加。(C)2018 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
The formation mechanism of twin structures in p-type (Bi0.25Sb0.75)(2)Te-3 compound was examined using high-resolution transmission electron microscopy (HR-TEM) and computer simulations. The results shown that the formation of twins is analogous to the twinning mechanism via synchronized activation of Shockley partial dislocations commonly observed terminating {111} growth and annealing twins in face centered cubic (FCC) metals. The {10 (1) over bar0} boundary, as an incoherent twin boundary (ITB), is mobile due to its lower shear stress compared to that of the coherent {0001} twin boundary; thickness of the twin region can be reduced or increased according to the direction of the movement. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.