On the accurate bond-valence parameters for the Sb3+/O2- ion pair

The improved values of the bond-valence parameters for the Sb3+/O(2-)ion pair, r(0) = 1.927 angstrom and b = 0.446 angstrom, have been deduced from the crystal structures of the alpha and beta polymorphs of Sb2O3 and from the set of precisely determined complex structures containing [Sb3+ O-n] coordination shells.