Crystal Field in Rare-Earth Trichlorides. IV. Parameter Variations

Abstract
Parameter variations are determined for changes in the ligand coordination angles and distances in Pr3+:LaCl3. Parameters for Sm3+ and Er3+ substituted in LaCl3 are also calculated. These results are used in conjunction with the superposition approximation to discuss the variation of parameters down the rare‐earth series in the trichlorides and to predict values of the dynamic orbit–lattice parameters in PrCl3.