Phase transitions in PbTe under quasi-hydrostatic pressure up to 50GPa
Phase transitions in PbTe under quasi-hydrostatic pressure up to 50GPa
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PbTe 在高达 50GPa 的准静水压力下的相变
DOI：
10.1080/08957959.2013.848278
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发表时间：
2013-12-01
影响因子：
2
通讯作者：
Liu, Jing
中科院分区：
文献类型：
--
作者：
Li, Yanchun;Lin, Chuanlong;Liu, Jing
利用同步辐射X射线衍射（XRD）技术在金刚石对顶砧装置上，在高达50 GPa的准静水压力下研究了PbTe的晶体结构。当压缩到6.6GPa时，初始NaCl相转变为中间相，其被证实为正交晶系结构，空间群为Pnma。在18.4 GPa下，中间Pnma相经历向CsCl结构的相变。对NaCl相和中间相之间晶体结构的系统分析表明，Pnma相的结构可能是由NaCl结构的畸变引起的。CsCl相的体积模量为B-0=52（2）GPa，其中V-0=60.8（4）埃（3）和B-0=4.0（固定），略大于NaCl相（B-0=44（1）GPa）和中间相（B-0=49（3）GPa）。
PbTe has been investigated using synchrotron X-ray diffraction (XRD) in a diamond anvil cell under quasi-hydrostatic pressures up to 50 GPa. Upon compression to 6.6 GPa, the initial NaCl phase transforms to an intermediate phase, which is confirmed to be an orthorhombic structure with a space group Pnma. At 18.4 GPa, the intermediate Pnma phase undergoes a phase transition to the CsCl structure. The systemic analysis of the crystal structures between the NaCl and intermediate phases indicates that the structure of the Pnma phase could be derived from the distortion of the NaCl structure. The bulk modulus of the CsCl phase is B-0=52(2) GPa with V-0=60.8(4) angstrom(3) and B-0=4.0 (fixed), slightly larger than the NaCl phase (B-0=44(1) GPa) and the intermediate phase (B-0=49(3) GPa).