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

Journal of Superconductivity and Novel Magnetism Volume: 26 Issue: 7 Pages: 2521-2524 Published: 2013

X-ray powder diffracts raw of the LCM (a) and DCM compounds (b)

Writers: Pedro Linhares C. Filho; Petrucio Barrozo; D. A. Landinez-Tellez; R. F. Jardim; W. M. Azevedo; J. Albino Aguiar

Keywords: Combustion synthesis; Ferromagnetic materials; X-ray powder diffraction; Perovskite; Manganite

Abstract: In this article, the structural and magnetic properties of the Ln2MnCoO6 (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 TC 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.

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DOI: 10.1007/s10948-012-1689-8

Robson Lima
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