The dipolar correlation factor and permittivity of ice IV and V

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Abstract
The dipolar correlation factor, g, of polycrystalline ice IV and V has been calculated using the molecular data for their crystal structures. For dendritic probabilities of orientation of water molecules, the contributions to g from the first, second and third neighbours in ice IV are 1·25, 0·43 and 0·11 respectively. The corresponding contributions in ice V are 1·20, 0·23 and -0·03. g is 2·79 for ice IV and 2·39 for ice V. The calculated dielectric permittivities of ice IV and V are 135 and 114 respectively. It seems that the dipole moment of a water molecule in the high-density phases of ice can be given reasonably well by the Onsager model of a point dipole at the centre of a spherical cavity of isotropic polarizability.

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