Alternative presentation of the Brown–Wu bond-valence parameters for some s 2 cation/O2− ion pairs

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Abstract
Using the least-squares refinement procedure, high-performance Brown–Wu bond-valence parameters, r 0 and n, reported for the Sn2+/O2−, Sb3+/O2−, Te4+/O2− and I5+/O2− ion pairs have been converted into the commonly used bond-valence parameters, r 0 and b. The r 0 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.