Ferromagnetism in a new manganese-related brownmillerite:: La0.5Sr0.5MnO2.5

被引：13

作者：

Cortes-Gil, Raquel

Ruiz-Gonzalez, M. Luisa

Alonso, Jose M.

Vallet-Regi, Maria

Hernando, Antonio

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

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, Dept 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 | 2007年 / 13卷 / 15期

关键词：

electron diffraction; electron microscopy; magnetic properties; manganese; mixed-valent compounds;

D O I：

10.1002/chem.200601279

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The topotactic reduction of La0.5Sr0.5MnO3 leads to ordering of the anionic vacancies in the La0.5Sr0.5MnO2.5 composition. The isolated material, which is isostructural with Sr2Fe2O5, crystallises in the brownmillerite structural type with unit cell parameters a=0.54117(3), b= 1.67608(12), c = 0.54004(3) nm and space group Ibm2. Its microstructural characterisation by means of electron diffraction and high-resolution electron microscopy suggests a complex microstructure arising from the coherent intergrowth of different brownmillerite-type domains that show short-range ordering at the A sub-lattice. ne layer structure of La0.5Sr0.5MnO2.5 leads to a double magnetic behaviour where a ferromagnetic two-dimensional component is present.

引用

页码：4246 / 4252

页数：7

共 43 条

[1] Mn4+ cation localization in La-rich La1-xCaxMnOy manganites [J].