Dielectric loss in RbCl crystals doped with Co2+ ions

2014 Dielectric loss studies have been made in rubidium chloride crystals doped with Co2+ impurities. In this case the impurity ion consists of d-electrons in its outermost shell and is much smaller than the host cation. The peaks in the tan 03B4 vs. frequency isotherms follow an Arrhenius type relation. The values of activation energy for the I-V dipole and the pre-exponential factor have been determined and compared with the corresponding values in other related systems. The Co2+ impurities are envisaged to have occupied interstitial sites in the lattice and a new vacancy relaxation model is proposed. LE JOURNAL DE PHYSIQUE TOME 40, AOÛT 1979, Classification Physics Abstracts 77.40