“…Using different calculation schemes, a few authors (Burns et al, 1997;Sidey, 2006;Malcherek & Schlü ter, 2007;Sidey et al, 2008) have simultaneously refined the r 0 and b values for use in the 'canonical' Brown-Altermatt formula (2), and have greatly improved approximations of the real 's ij À r ij ' correlations for certain ion pairs. If a researcher fails to obtain good agreement using the conventional BV parameters reported for a given ion pair, the use of the alternate calculation schemes developed by the above authors for determining reliable BV parameters should always be attempted.…”