Cation Distribution in Ulvöspinel Fe2TiO4

Autor:	P. T. Clarke, M. J. Rossiter
Rok vydání:	1965
Předmět:	Ulvöspinel Multidisciplinary Mössbauer effect Spinel Radiochemistry Oxide engineering.material chemistry.chemical_compound chemistry Oxidation state Ferrimagnetism engineering Curie temperature Physical chemistry Orders of magnitude (data)
Zdroj:	Nature. 207:402-402
ISSN:	1476-4687 0028-0836
DOI:	10.1038/207402a0
Popis:	RECENTLY we have considered it of interest to examine several spinel oxides containing iron, using the Mossbauer effect in the isotope iron-57, in order to determine the cationic oxidation state and site distribution1. A case in which such information might be valuable is the oxide Fe2TiO4. Since the original X-ray intensity investigation of Barth and Posnjak2 this spinel has been considered to possess the inverse arrangement Fe[TiFe]O4. However, the determination of cation distribution for an oxide with cations of such similar scattering coefficients is not easy. In addition the calculated intensity value for the 135 reflexion given by those authors for the normal arrangement is in error by several orders of magnitude. The inverse arrangement is favoured for a 2–2–4 spinel on the basis of electrostatic considerations3, and the known ferrimagnetic properties of Fe2TiO4 (Curie point 120° K (ref. 4)). The normal arrangement Ti[FeFe]O4 requires Ti4+ ions on tetrahedral A sites. This is uncommon, but has been observed by Gorter5 in the material: on the basis of saturation magnetization and g-factor determinations.
Databáze:	OpenAIRE
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