Magnetic Structure and Electronic Study of Complex Oxygen-Deficient Manganites

被引：12

作者：

Cortes-Gil, Raquel ^{[1
,2
]}

Hernando, Maria ^{[1
]}

Ruiz-Gonzalez, M. Luisa ^{[1
]}

Cespedes, Eva ^{[3
]}

Prieto, Carlos ^{[3
]}

Alonso, Jose M. ^{[2
,3
]}

Vallet-Regi, Maria ^{[2
,4
]}

Hernando, Antonio ^{[2
,5
]}

Gonzalez-Calbet, Jose M. ^{[1
,2
]}

机构：

[1] Univ Complutense Madrid, Fac Quim, Dept Quim Inorgan, E-28040 Madrid, Spain

[2] UCM, CSIC, ADIF, Inst Magnetismo Aplicado, Madrid 28230, Spain

[3] CSIC, Inst Ciencia Mat, E-28049 Madrid, Spain

[4] Univ Complutense Madrid, Fac Quim, Dpto Quim Inorgan & Bioinorgan, E-28040 Madrid, Spain

[5] Univ Complutense Madrid, Fac Fis, Dept Fis Mat, E-28040 Madrid, Spain

来源：

CHEMISTRY-A EUROPEAN JOURNAL | 2008年 / 14卷 / 29期

关键词：

magnetic properties; manganese; neutron diffraction; perovskite phases; X-ray absorption spectroscopy;

D O I：

10.1002/chem.200800723

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Neutron diffraction and X-ray absorption near-edge structure (XANES) studies have been performed in La0.5Ca0.5MnO2.5, La0.5Sr0.5MnO2.5 and Nd0.5Sr0.5MnO2.5 oxygen-deficient perovskite compounds obtained by topotactic reduction. They all exhibit a brownmillerite structure with G-type antiferromagnetic ordering. Mn2+, Mn3+ and Mn4+ coexist at the octahedral sites, whereas only Mn2+ is placed in the tetrahedral positions. A magnetic moment of 1.6 mu(B) has been detected at the tetrahedral layers, which can be explained by assuming Mn2+ is in a low-spin configuration.

引用

页码：9038 / 9045

页数：8

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