Vibrational properties of ZnTe at high pressures
Vibrational properties of ZnTe at high pressures
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DOI：
10.1088/0953-8984/14/4/309
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发表时间：
2002-01
期刊：
影响因子：
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通讯作者：
J. Camacho;I. Loa;A. Cantarero;K. Syassen
中科院分区：
文献类型：
--
作者：
J. Camacho;I. Loa;A. Cantarero;K. Syassen
ZnTe 的拉曼光谱是在 T = 300 K、高达 15 GPa 的静水压力下测量的。闪锌矿相 (0-9.5 GPa) 的一阶和二阶拉曼特征频率结果用于建立压力下声子色散关系的刚性离子模型。讨论了计算的声子态密度、模式 Gruneisen 参数和作为压力函数的热膨胀系数。考虑了压力对拉曼光谱特征的宽度和强度的影响。报告了 ZnTe 高压相的拉曼光谱。这些光谱表明在 13 GPa 附近可能存在新相，介于 ZnTe 的朱砂相和斜方晶 (Cmcm) 相之间。
Raman spectra of ZnTe were measured under hydrostatic pressures up to 15 GPa at T = 300 K. Results for the frequencies of first- and second-order Raman features of the zincblende phase (0-9.5 GPa) are used to set up a rigid-ion model of the phonon dispersion relations under pressure. Calculated phonon densities of states, mode Gruneisen parameters and the thermal expansion coefficient as a function of pressure are discussed. The effect of pressure on the widths and intensities of Raman spectral features is considered. Raman spectra of high-pressure phases of ZnTe are reported. These spectra indicate the possible existence of a new phase near 13 GPa, intermediate between the cinnabar and orthorhombic (Cmcm) phases of ZnTe.