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The 23Na nuclear quadrupole coupling constant is determined for 10 compounds of the α-NaFeO2 type, namely, NaInO2, NaInS2, NaInSe2, NaCrO2, NaCrS2, NaCrSe2, NaTiO2, NaTlO2, NaScO2, and NaAlO2. The electric field gradient is calculated on the basis of a point-charge model, and charge distributions are obtained for the complex ions. The charges on the metal ions appear to correlate with the average electronegativity difference between the metal and chalcogen.
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Peterson et al. (1969) studied this question.
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