CdTe的状态方程及其高压相变

Equation of State and High Pressure Phase Transition of CdTe

摘要: 用金刚石压砧高压X光衍射技术研究了Ⅱ-Ⅵ族化合物CdTe的室温状态方程和室温高压相变。实验的最高压力达39.2 GPa。实验中发现CdTe从(3.30.1)GPa开始从闪锌矿结构相相NaCl结构相转变，相变时体积收缩15.8%；从(10.30.2)GPa开始从NaCl相向-Sn结构相转变，相变时无体积突变；在(12.20.2)GPa由-Sn相向正交结构相转变，相变时也无体积突变。CdTe的压缩数据用最小二乘法以Bridgman状态方程和Murnaghan状态方程拟合，得到其零压时合相变压力时各个相的体弹模量及体弹模量的压力微商，并与其它的实验合理论结果进行比较。
- CdTe /
- 状态方程 /
- 相变
Abstract: The equation of state and high pressure phase transition of CdTe were studied by DAC X-ray diffraction technique at room temperature up to 39.2 GPa. The phase transition sequence is: from zinc blede phase to NaCl phase at (3.30.1)GPa with 15.8%volume change, from NaCl phase at to -Sn phase at (10.30.2)GPa without volume change and from -Snphase to orthorhombic phase at (12.20.2)GPa without volume change too. The data of compression of CdTe were fitted to bridgeman state equation of Murnaghan state equation. The bulk modulus and its pressure derivative of each phase was compared with other experimental and theoretical results.
- CdTe /
- equation of state /
- phase transition