OXYGEN-DEFICIENT BROWNMILLERITES - CATION COORDINATION AND MAGNETIC-PROPERTIES

被引：6

作者：

BENLOUCIF, R ^{[1
]}

NGUYEN, N ^{[1
]}

GRENECHE, JM ^{[1
]}

RAVEAU, B ^{[1
]}

机构：

[1] UNIV MAINE,SPECTR MOSSBAUER LAB,F-72017 LE MANS,FRANCE

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 1990年 / 51卷 / 01期

关键词：

Brownmillerite; magnetic properties; Mössbauer study; oxygen non-stoichiometry; oxygen-deficient oxides;

D O I：

10.1016/0022-3697(90)90135-3

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

New oxygen-deficient brownmillerites Ca2Fe2-xMxO5- x 2 have been synthesized and characterized by X-ray diffraction and chemical analysis for M = Mg, Ni, Cu, Zn. The Mössbauer study of these phases shows only the presence of Fe(III) and confirms the oxygen non-stoichiometry; it suggests the existence of pyramidal sites and allows the ordered cationic distribution to be established according to the formula Ca2(Fe1111)Te(Fe111 1-2xM11x)oc (Fe111x)PyO5- x 2. The study of the magnetic susceptibility vs temperature shows a broad antiferromagnetic transition, with a classical decrease of TN vs x. A particular feature is the higher TN value of the magnesium phase compared with the nickel and copper oxides. This latter behavior is interpreted in terms of size factors influencing the interaction between the octahedral (or pyramidal) and tetrahedral layers. © 1990.

引用

页码：79 / 83

页数：5

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