Inter-dipolar interaction in NaNO2

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  • Inter-Dipolar Interaction in NaNO<SUB>2</SUB>

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The X-ray diffuse scattering from a crystal of NaNO2 at temperatures above the Néel temperature is analysed to determine the nature of the inter-dipolar interaction in this substance. By taking the Ising model, the space correlation is calculated with the random phase approximation leaving the coefficients of the short range interaction as parameters, and is compared with the observed intensity distribution of the diffuse scattering. It is found that a large part of the inter-dipolar interaction is of the electrostatic nature, and in addition to it, there are an antiferroelectric coupling between the neighbours along the a-axis and a ferroelectric coupling between the neighbours of the corner- and body-centre molecules. The coefficients of the short range interaction decrease with temperature more rapidly than that of the electrostatic interaction. The short range interaction may come from the covalent bonding between N and O and also from the Pauli repulsive interaction between the molecules.

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