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

The improved values of the bond-valence parameters for the Sb(3+)/O(2-) ion pair, r(0) = 1.927 A and b = 0.446 A, have been deduced from the crystal structures of the alpha and beta polymorphs of Sb(2)O(3) and from the set of precisely determined complex structures containing [Sb(3+)O(n)] coordination shells.