Figure 3 . Strain energy density in volume-conserving tetragonal distortion (a), (d), (g), [100]/[010] strain (b), (e), (h) and shear deformation (c), (f), (i) for NH3,N2O,and NO hydrate, respectively .
Table 1 .The predicted elastic constants, density, bulk modulus, shear modulus, Poisson’s ratio, Young’s modulus, compressional wave speed, and shear speed of NH3, N2O and NO hydrates