Effects of thermal treatment on structure and magnetic properties of nonstoichiometric perovskite-type oxides La0.67Sr0.15□0.18MnO3-δ

被引：0

作者：

Ge, J. J. ^{[1
,2
]}

Yang, M. ^{[1
,2
]}

Xue, X. B. ^{[1
,2
]}

Du, J. ^{[1
,2
]}

Wu, X. S. ^{[1
,2
]}

Tan, W. S. ^{[3
]}

机构：

[1] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China

[2] Nanjing Univ, Dept Phys, Nanjing 210093, Peoples R China

[3] Nanjing Univ Sci & Technol, Dept Phys, Nanjing 210093, Peoples R China

来源：

PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE | 2011年 / 208卷 / 10期

基金：

美国国家科学基金会;

关键词：

magnetic properties; magnetocaloric effect; perovskite; structural properties; STRONTIUM;

D O I：

10.1002/pssa.201084189

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The structural and magnetic properties of La0.67Sr0.15 square 0.18MnO3-delta manganites obtained with various thermal treatment conditions have been studied. X-ray diffraction studies show that all the samples crystallize with the rhombohedral symmetry and the space group is R-3c. No change in structural symmetry is found for all samples with thermal treatment. However, the bond angles of Mn-O-Mn and O1-Mn-O2 deviate from 180 and 90 degrees, respectively, indicating the presence of Jahn-Teller type distortion in the MnO6 octahedron. And the oxygen content shows determinant affect on compound magnetic properties. With increasing oxygen content induced by thermal treatments, the Curie temperatures T-C increases systematically from similar to 280 to similar to 303 K, showing the dependence of sample magnetic properties on sintering processes. A maximum value of [Delta S-M(T, H)] is measured to be more than 5 J/kg . K near the curie temperature, indicating the potential of utilizing the strong magnetocaloric effect of these materials in magnetic refrigeration. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：2365 / 2368

页数：4

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