Studies on the formation of zinc ferrite

Krishnamurthy, K. R. ; Gopalakrishnan, J. ; Aravamudan, G. ; Sastri, M. V. C. (1974) Studies on the formation of zinc ferrite Journal of Inorganic and Nuclear Chemistry, 36 (3). pp. 569-573. ISSN 0022-1902

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The reactions of zinc oxide with α-Fe2O3 and with γ-Fe2O3 leading to the formation of zinc ferrite (ZnFe2O4) have been studied at different partial pressures of oxygen in the temperature range 500-800°C. The ferrite spinel is formed more readily when γ-Fe2O3 is used as the reactant. The DTA and X-ray diffraction results indicate that the γ-Fe2O3 phase is stabilized in presence of ZnO. The lowering of partial pressure of oxygen in the ambient atmosphere favours the formation of zinc ferrite, indicating a cyclic redox process featuring Fe3+, Fe2+ and oxygen at the phase boundaries. At very low oxygen pressures, conversion to zinc ferrite is not facilitated, apparently due to the formation of an intermediate species, Fe3-xZnxO4, which, under these conditions, is not easily converted to ZnFe2O4.

Item Type:Article
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ID Code:12793
Deposited On:11 Nov 2010 08:56
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