Structural and Magnetic Properties of Ln2CoMnO6(Ln = Dy and La) Produced by Combustion Synthesis

被引：35

作者：

Filho, Pedro Linhares C. ^{[1
]}

Barrozo, Petrucio ^{[2
]}

Landinez-Tellez, D. A. ^{[3
]}

Jardim, R. F. ^{[4
]}

Azevedo, W. M. ^{[5
]}

Albino Aguiar, J. ^{[1
,6
]}

机构：

[1] Univ Fed Pernambuco, Programa Posgrad Ciencia Mat, BR-50670901 Recife, PE, Brazil

[2] Univ Fed Sergipe, Dept Fis, BR-49100000 Sao Cristovao, SE, Brazil

[3] Univ Nacl Colombia, Dept Fis, Bogota 5997, Colombia

[4] Univ Sao Paulo, Dept Fis, BR-05315970 Sao Paulo, Brazil

[5] Univ Fed Pernambuco, Dept Quim, BR-50670901 Recife, PE, Brazil

[6] Univ Fed Pernambuco, Dept Fis, BR-50670901 Recife, PE, Brazil

来源：

JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM | 2013年 / 26卷 / 07期

关键词：

Combustion synthesis; Ferromagnetic materials; X-ray powder diffraction; Perovskite; Manganite; COLOSSAL MAGNETORESISTANCE; PEROVSKITES; LAMNO3;

D O I：

10.1007/s10948-012-1689-8

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

In this article, the structural and magnetic properties of the Ln(2)MnCoO(6) (Ln = La and Dy) produced by the combustion method are reported. The samples were characterized by X-ray diffraction (XRD) with Rietveld refinement, and their magnetic properties by studying the dependence of the magnetization with the magnetic field and temperature. XRD analysis reveals that the La2MnCoO6 (LCM) consists of a mixture of crystalline orthorhombic, monoclinic, and rhombohedral phases. This mixture might be originated by the mixing of valence states of the Co+2/Mn+4 and Co+3/Mn+3. Dy2CoMnO6 (DCM) presents a mixed composition of hexagonal and orthorhombic structures with the transition metal atoms in mixed valences. Magnetic measurements show that the magnetic transition temperature T-C decreases from 150 K to 85 K when the La ions are replaced by Dy. We also observe that the magnetic order changes from a ferromagnetic to a ferrimagnetic when La is replaced by Dy.

引用

页码：2521 / 2524

页数：4

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