Abstract
The structures of the title materials have been refined by time-of-flight neutron powder diffraction. LiFe5O8, P 4332, a = 8.3185(1) Å; LiZnNbO4, P 4322, a = 6.0804(1), c = 8.3988(1) Å; ZnTi2O4, P4322, a = 5.9927(1), c = 8.4266(2) Å. All three materials have structures that are ordered derivatives of the ideal spinel structure. Bond lengths are analyzed in terms of bond valences. Modifications to the "equal valence rule" [I. D. Brown, Acta Crystallogr. Sect. B 35, 1305 (1977)] for predicting bond lengths in crystals are shown to be necessary in oxides of early transition elements.
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