Abstract
The EPR spectra of Cu 2+ in NH 4 Cl 1− x Br x single crystals show m 1-dependent linewidth variations in both the parallel and perpendicular regions. These variations are ascribed to random variations of the spin-Hamiltonian and bonding parameters which arise due to the random distributions of the ratio of Cl −/Br − ligands around the Cu 2+ ion in the host. The distributions of these parameters are calculated using the existing theories for glasses. These distributions are independent of x for x > 0.07 showing that in a given crystal (with x > 0.07) all possible Cl −/Br − combinations are present. It has been found that crystals with copper centers having axial ammonia ligands do not show such marked m 1-dependence as those having axial water ligands. This is attributed to the larger covalency of the axial ammonia molecules.
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