Host‐Lattice Effects in the EPR Spectra of Gd 3+ Doped Hydrated Single Crystals of Rare‐Earth Chlorides, Nitrates, and Sulphates

Large amount of X‐band EPR data, for external field orientations in both, the zx and xy planes, are obtained for Gd 3+ ion doped rare‐earth trichloride hexahydrate (RCH), rare‐earth trisulfate octahydrate (RSO), and rare‐earth trinitrate hexahydrate (RNH) single crystals. A rigorous least‐squares fitting procedure is used to evaluate the spin Hamiltonian parameters g ‖, g ⊥ and b   l m(including those with negative m values). Approximate linear dependences upon the host rare‐earth ion radius is found on both, the parameters b   2 0and b   2 2within each family of the isostructural hosts investigated.