Temperature dependence of the cation distribution in zinc ferrite (ZnFe2O4) from powder XRD structural refinements

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Zinc ferrite (ZnFe2O4) has the cubic spinel structure with an (approximately) normal cation distribution. It was synthesised by direct reaction of the oxides at 800°C, and also by using a sodium tungstate flux with excess ZnO. The cation distributions in quenched samples of the flux-grown material were determined by powder X-ray diffraction. The degree of inversion in ZnFe2O4 increases from 0.02(2) at 500°C to 0.19(2) at 950°C. Samples quenched from higher temperatures show no further increase in x, in agreement with the trend in ao. 57Fe Mossbauer spectra were collected for a few samples at 80K and 298K. All spectra show only a single doublet with hyperfine parameters characteristic of octahedral Fe3+. The tetrahedral Fe3+ deduced from the XRD refinements cannot be resolved. -from Author

Original languageEnglish
Pages (from-to)571-580
Number of pages10
JournalEuropean Journal of Mineralogy
Issue number3
Publication statusPublished - 1992
Externally publishedYes

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