Derivation of bond-valence parameters for some cation-oxygen pairs on the basis of empirical relationships between ro and b

Relationships between the r o and b bond-valence parameters are investigated for ideal and distorted coordination polyhedra. For some ranges of the b values, this relationship can be approximated by linear functions, which are used to derive bond-valence parameters for some cation-oxygen pairs ( r o , b [Å]): Cu 2+ —O (1.679, 0.36), Pb 2+ —O (1.963, 0.49), Hg 2+ —O (1.924, 0.38), Bi 3+ —O (1.990, 0.48), Sb 3+ —O (1.885, 0.53), Y 3+ —O (2.028, 0.35), La 3+ —O (2.086, 0.45), Nd 3+ —O (2.021, 0.46).