Etude par spectrometrie d'absorption infra-rouge des facteurs influencant la transformation ordre-desordre de ferrites γ lacunaires derivant de l'oxydation de spinelles ferreux期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Etude par spectrometrie d'absorption infra-rouge des facteurs influencant la transformation ordre-desordre de ferrites γ lacunaires derivant de l'oxydation de spinelles ferreux

Authors:	B. Gillot

Affiliation:	Laboratoire de Recherches sur la Réactivité des Solides associé au C.N.R.S., Faculté des Sciences Mirande, B.P. 138, 21004 DIJON CEDEX France

Abstract:	The order-disorder phenomenon in defect γ-spinels of type $(Fe_{(8?8y)3}^{3+} M_{8y3}^{3+} □_{13})O_{4}^{2?}$ and $Fe_{(8?2x)3}^{3+} M_{x}^{2+} □_{(1?x)3})O_{4}^{2?}$ with M³⁺ = A1³⁺, Cr³⁺ and M²⁺ = Zn²⁺, Co²⁺, Mn²⁺ obtained from ferrous spinels was investigated using IR spectrometry. These compounds possess a vacancy ordering on octahedral sites for substitution extents of less than 0.30 and no ordering has been observed for substitution extent > 0.40. The ordering process is also influenced by the nature and position of the trivalent or divalent cation, particle size, heating temperature and oxidation time.

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