The distribution of Fe3+ and Ni2+ over the four crystallographically distinct octahedral cation sites in FeNi2BO5 has been precisely determined from a single resonant powder X-ray pattern collected 16 eV below the Fe K absorption edge and is very similar to that in AlNi2BO5, showing that charge rather than size determines the cation distribution in these borates.
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Perkins et al. (1991) studied this question.
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