Alternative presentation of the Brown-Wu bond-valence parameters for some s² cation/O^2- ion pairs

Using the least-squares refinement procedure, high-performance Brown-Wu bond-valence parameters, r₀ and n, reported for the Sn²⁺/O^2-, Sb³⁺/O^2-, Te⁴⁺/O^2- and I⁵⁺/O^2- ion pairs have been converted into the commonly used bond-valence parameters, r₀ and b. The r₀ and b values obtained can be recommended as a replacement for the conventional bond-valence parameters based on the `universal constant' b = 0.37 Å.