High-pressure x-ray diffraction studies on HgTe and HgS to 20 GPa
High-pressure x-ray diffraction studies on HgTe and HgS to 20 GPa
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DOI：
10.1103/physrevb.28.3330
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发表时间：
1983-09
影响因子：
3.7
通讯作者：
A. Werner;H. .. Hochheimer;K. Strössner;A. Jayaraman
中科院分区：
文献类型：
--
作者：
A. Werner;H. .. Hochheimer;K. Strössner;A. Jayaraman
用高达20 Gpa的高压X射线衍射技术研究了HgTe和HgGS。HgTe在(0-20)Gpa范围内经历了三次压力诱导相变，从闪锌矿到朱砂，再到岩盐再到β−锡，分别在1.4Gpa、8 Gpa和12 Gpa下发生。无论是在高压X射线衍射中还是在高压拉曼研究中，HGS都没有显示出任何证据表明从朱砂结构到20 Gpa的转变。除了朱砂结构的侵入外，上述转变序列与CdTe的压力诱导序列一致。高压X射线测量结果表明，HgTe和HgTe的朱砂相具有很强的可压性，HgTe和HgTe的B0和B0‘分别为19.4±0.5 Gpa和11.1 Gpa，HgTe为16.0±0.5 Gpa和7.3.体模、相变体积变化和高压相的晶格参数都是从x射线数据中确定的。观察到的HgTe的跃迁序列似乎与最近对III-V和II-VI化合物加压下相稳定性的赝势总能量计算的预测一致。
HgTe and HgS have been investigated with the use of the high-pressure x-ray diffraction technique to 20 GPa. HgTe undergoes three pressure-induced phase transitions in the (0-20)-GPa range, from zinc blende to cinnabar to rocksalt to β− Sn, at 1.4, 8, and 12 GPa, respectively. HgS does not show any evidence for a transition from the cinnabar structure up to 20 GPa, either in high-pressure x-ray diffraction or in high-pressure Raman studies. The above transition sequence agrees with the pressure-induced sequence for CdTe except for the intrusion of the cinnabar structure. Evaluation of the bulk modulus B 0 and B 0′ from high-pressure x-ray data reveals that the cinnabar phases of HgTe and HgS are very compressible; B 0 and B 0′ are 19.4±0.5 GPa and 11.1 for HgS, and 16.0±0.5 GPa and 7.3 for HgTe. Bulk moduli, volume changes for transitions, and lattice parameters of the high-pressure phases have all been determined from the x-ray data. The observed transition sequence for HgTe appears to be in agreement with the predictions of recent pseudopotential total-energy calculations for phase stability in III-V and II-VI compounds under pressure.