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首页> 外文期刊>Zeitschrift fur Physik, B. Condensed Matter >Elasticity of BaFCl single crystal under hydrostatic pressure
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Elasticity of BaFCl single crystal under hydrostatic pressure

机译：静水压力下BaFCl单晶的弹性

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The sound velocities for longitudinal and transverse waves have been measured in single crystalline BaFCl at room temperature using ultrasonic pulse echo and Brillouin scattering techniques. The complete set of elastic constants is deduced and lead to the bulk moduli values of BaFCl at ambiant conditions (B_0 = 44 GPa, B_⊥ = 133 GPa, B_‖ = 131 GPa) which are compared with those obtained by a shell model. Moreover, using the ultrasonic technique under pressure, the pressure derivatives of the second order elastic constants at 298 K have been determined up to 0.3 GPa. All moduli increase linearly with pressure in this pressure range, allowing to determine directly and separately the first derivative of the bulk modulus B'_0 = 5.8. These data are used to calculate a Murnaghan equation of state. A detailed comparison is given between our results with those recently obtained by X-ray diffraction on powder or calculated using the local density approximation method. Finally, the anisotropy of BaFCl under pressure is discussed.
机译：使用超声波脉冲回波和布里渊散射技术在室温下在单晶BaFCl中测量了纵向和横向波的声速。推导了完整的弹性常数集，并得出了在环境条件下（B_0 = 44 GPa，B_⊥= 133 GPa，B_''= 131 GPa）下BaFCl的体积模量值，并将其与壳模型进行了比较。此外，使用超声技术在压力下，已经确定了在298 K时高达0.3 GPa的二阶弹性常数的压力导数。在此压力范围内，所有模量随压力线性增加，从而可以直接和分别确定体积模量B'_0 = 5.8的一阶导数。这些数据用于计算Murnaghan状态方程。我们的结果与最近通过粉末X射线衍射获得的结果或使用局部密度近似法计算得出的结果之间进行了详细的比较。最后，讨论了BaFCl在压力下的各向异性。

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