Compressional and Shear-Wave Velocities of the Polycrystalline CaGeO3 Perovskite to 10 GPa
Compressional and Shear-Wave Velocities of the Polycrystalline CaGeO3 Perovskite to 10 GPa
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DOI：
10.1103/physrevb.75.024107
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发表时间：
2007
影响因子：
3.7
通讯作者：
Wei Liu;Baosheng Li
中科院分区：
文献类型：
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作者：
Wei Liu;Baosheng Li
压缩和剪切波的速度和晶胞体积的正交CaGeO{sub 3}钙钛矿已被测量到10 GPa，在环境温度下，使用超声干涉结合同步辐射X射线。将所有速度和晶胞体积数据拟合到有限应变方程，得到零压绝热体模量和剪切模量及其压力导数K{sub S 0}=194.6（11）GPa，G{sub 0}=109.5（5）GPa，K{sub S 0}{sup '}=6.4（2），G{sub 0}{sup '}=1.7（1），均方根失配为0.009 km s{sup -1}。从目前的研究中的数据，我们已经观察到没有不连续性或弹性软化的体积或剪切模量高达10 GPa的峰值压力。
Compressional and shear-wave velocities and unit-cell volumes of orthorhombic CaGeO{sub 3} perovskite have been measured up to 10 GPa at ambient temperature using ultrasonic interferometry in conjunction with synchrotron x radiation. Fitting all velocity and unit-cell volume data to finite-strain equations yields the zero-pressure adiabatic bulk and shear moduli and their pressure derivatives K{sub S0}=194.6 (11) GPa, G{sub 0}=109.5 (5) GPa, K{sub S0}{sup '}=6.4 (2), G{sub 0}{sup '}=1.7 (1), with an rms misfit of 0.009 km s{sup -1}. From the data in the current study, we have observed no discontinuities or elasticity softening for either the bulk or shear moduli up to the peak pressure of 10 GPa.