Abstract
The ferroelastic and ferroelectric properties of KCN crystals were investigated through the EPR spectra of HCNand N; molecular ions in the lattice. The domain structure generated by the cubic + oethorhombic transition at 168 K consist of six non equivalent domain orientations. The analysis of the HCNspectra between 83 K and 170 K showed that reorientations of the CNions occurs between the [loo] and orthorhombic directions, which have a minimum elastic energy 7.4 meV higher than the [loo]. Based on a simple model Hamiltonian in which the interactions between the CNions are of an electrostatic dipole-dipole nature, we showed that the ordered phase consist of an antiferroelectric state.
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