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First principles calculation of the elasticity of ice VIII and X

机译:第一个原理计算冰和x的弹性

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The elastic constants of ice VIII and ice X phases under pressure have been determined at static 0 K conditions using first principles calculation. A step-like increase of the elastic constants of ice VIII phase occurred at 100-110 GPa due to hydrogen bond symmetrization. The elastic constants, and the pressure dependencies of these constants, of ice X and VIII are completely distinct. Due to these differences, these two phases can be distinguished on the basis of the elastic behavior. Conversely, the experimental elastic constant of C-11 of ice VII gradually changes from an ice VIII like asymmetric hydrogen bond to a symmetric bond character within a wide pressure range. This finding suggests that the transition from ice VII to ice X starts around 30 GPa and completes at 110 GPa. Published by AIP Publishing.
机译:使用第一个原理计算,在静态0k条件下确定了冰VIII和冰X相的弹性常数。 由于氢键对称性,在100-110GPa下发生冰VIII相的弹性常数的阶梯状增加。 弹性常数和这些常数的压力依赖性冰x和viii是完全不同的。 由于这些差异,可以基于弹性行为来区分这两个阶段。 相反,冰VII的C-11的实验弹性常数逐渐从宽压范围内的冰VIII与相对对称氢键相似的对称键合。 这一发现表明,从冰VII到冰X的过渡率大约在30GPa大约为110 GPa完成。 通过AIP发布发布。

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