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We investigate the effect of nuclear quantum effects (NQEs) of hydrogen atomson the elasticity of ice VII at high pressure and ambient temperatureconditions using ab initio path-integral molecular dynamics (PIMD)calculations. We find that the NQEs of hydrogen contributes to the transitionof ice VII from a static disordered structure to a dynamically disorderedstructure at pressures exceeding 40 GPa. This transition is marked by adiscontinuous increase of the elastic constants. Comparison of ab initiomolecular dynamics and PIMD calculations reveal that NQEs increase the elasticconstants of ice by about 20% at 70 GPa and 300 K.

Nuclear quantum effect on the elasticity of ice VII under pressure: A path-integral molecular dynamics study