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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Temperature dependence of the elastic shear modulus of the Laves-phase materials TaV_2 and TaV_2H_x
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Temperature dependence of the elastic shear modulus of the Laves-phase materials TaV_2 and TaV_2H_x

机译：Laves相材料TaV_2和TaV_2H_x的弹性剪切模量的温度依赖性

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摘要

Resonant ultrasound has been used to measure the shear modulus of polycrystalline TaV_2H_x for x = 0, 0.006, 0.10, 0.18, 0.34, and 0.53 over the temperature range of 20-300 K. The results show a strong influence of hydrogen on both the magnitude and the temperature dependence of the shear modulus of these materials. These results are in qualitative agreement with a model involving the electronic structure of these C15 Laves-phase materials. The symmetry of the C15 structure results in doubly-degenerate electronic energy levels at the X point of the Brillouin zone. These levels couple to the shear strain e_4 with resulting effects on the single-crystal elastic constant c_(44). The strong temperature and concentration dependence of c_(44) contributes to the measured shear moduli of these polycrystalline materials.
机译：在20-300 K的温度范围内，共振超声已用于测量x = 0、0.006、0.10、0.18、0.34和0.53时多晶TaV_2H_x的剪切模量。结果表明，氢对两个量级都有强烈影响以及这些材料的剪切模量的温度依赖性。这些结果与涉及这些C15 Laves相材料的电子结构的模型在质量上吻合。 C15结构的对称性导致在布里渊区的X点处双简并的电子能级。这些能级与剪切应变e_4耦合，从而对单晶弹性常数c_（44）产生影响。 c_（44）的强温度和浓度依赖性有助于测量这些多晶材料的剪切模量。

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