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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effect of Eu substitution on the crystallographic and magnetic properties of the BiMn2O5 oxide obtained by urea combustion

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Author(s):
Ferreira, Rafael A. [1, 2] ; dos Santos, Maria Elenice [2, 1] ; Morilla-Santos, Cassio [3] ; Lebullenger, Ronan [1] ; Pena, Octavio [1] ; Lisboa-Filho, Paulo Noronha [4]
Total Authors: 6
Affiliation:
[1] Univ Rennes 1, Inst Sci Chim Rennes UMR 6226, F-35014 Rennes - France
[2] UNESP Univ Estadual Paulista, POSMAT Programa Posgrad Ciencia & Tecnol Mat, Bauru, SP - Brazil
[3] Inst Tecnol Desenvolvimento LACTEC, Curitiba, Parana - Brazil
[4] UNESP Univ Estadual Paulista, Dept Fis, Fac Ciencias, Bauru, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: CERAMICS INTERNATIONAL; v. 40, n. 8, B, p. 13643-13648, SEP 2014.
Web of Science Citations: 2
Abstract

Polycrystalline oxide materials with nominal compositions BiMn2O5 and Bi0.9Eu0.1Mn2O5 were obtained by urea combustion. Crystallographic studies using X-ray diffraction and Rietveld Refinement techniques showed the formation of single-phase samples for both compositions, crystallizing in a mullite-type orthorhombic perovskite structure, space group Pbam (Z=4). Replacement of Bi+3 by Eu+3 promoted a slight distortion and a unit cell contraction due to a decrease of the c-parameter for Bi0.9Eu0.1Mn2O5. The SEM/EDX techniques confirmed the formation of single-phase materials with excellent mapping distribution. Magnetic measurements showed different behaviors: BiMn2O5 is an antiferromagnet (AFM) with a Neel temperature (T-N) of 41 K and a Curie-Weiss temperature Theta(CW) of -277 K, while Bi0.9Eu0.1Mn2O5 displayed a ferrimagnetic behavior with a T-C of 44K and Theta(CW) of 270 K. The role of Eu+3 and the mechanisms responsible for the magnetic transition are discussed on the basis of chemical bonds and exchange interactions. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved. (AU)

FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 07/08072-0 - Fundamental research in superconductivity and magnetism - systems potentially useful for aplications: advanced oxides and superconductors patterned with artificial structures
Grantee:Wilson Aires Ortiz
Support type: Research Projects - Thematic Grants