Mechanism of shear transformation in Ge–Bi–Te alloys
Mechanism of shear transformation in Ge–Bi–Te alloys
复制标题
Ge-Bi-Te 合金的剪切转变机制
DOI：
10.1002/pssr.200903214
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Yong Tae Kim
中科院分区：
文献类型：
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作者：
C. Sun;Jeong;Yong Tae Kim
由于NaCl晶格中的菱面体单元胞是由< 111 > NaCl方向的畸变引起的，因此在Ge-Bi-Te （GBT）的相变过程中也会出现同样的现象。基于这一假设，我们对GBT合金在两个结晶温度之间退火时的相变进行了透射电子显微镜（TEM）研究。原子尺度的TEM图像显示了相变过程中GBT中间结构的形成。利用得到的结果，我们建立了一个新的相变模型，其中Ge/Bi层在< 111 >方向有序；{111}面< 110 >方向发生连续剪切和扩张。（©2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim）
Since the rhombohedral unit cell in the NaCl lattice is caused by distortion along the 〈111〉 NaCl direction, the same phenomenon is expected during phase transition of Ge–Bi–Te (GBT). With this assumption, we performed transmission electron microscopy (TEM) studies on the phase transition in GBT alloys annealed at temperatures between the two crystallization temperatures. Atomic‐scale TEM images show the formation of a GBT intermediate structure during the phase transition. Using the obtained results, we developed a new phase transition model in which the Ge/Bi layers are ordered in the 〈111〉 direction; further, continuous shearing and dilation occur in the {111} plane in 〈110〉 direction. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)