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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.)

Physical properties of Sr2FeIrO6 and Sr1.2La0.8FeIrO6 double perovskites obtained by a new synthesis route

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Author(s):
Bufaical, Leandro ; Coutrim, Leandro T. ; Santos, Tatiane O. ; Terashita, Hirotoshi ; Jesus, Camilo B. R. ; Pagliuso, Pascoal G. ; Bittar, Eduardo M.
Total Authors: 7
Document type: Journal article
Source: Materials Chemistry and Physics; v. 182, p. 459-465, OCT 1 2016.
Web of Science Citations: 2
Abstract

Previous works on Sr2-xLaxFeIrO6 double perovskite (DP) series reported a possible ferromagnetic transition at T similar to 700 K for the x = 0.8 concentration, for which was observed the presence of spurious Fe2O3 phase. In order to prevent the formation of this impurity phase and check if this high temperature magnetic transition is intrinsic of the material, different synthesis routes became necessary. In this work, polycrystalline samples of Sr2-xLaxFeIrO6 (x = 0.0 and 0.8) have been synthesized by solid state reaction using a new heating treatment. The sample's properties were investigated by synchrotron x-ray powder diffraction (SXRD), transmission electron microscopy (TEM), magnetic susceptibility, specific heat and electrical resistivity, and compared with the previously reported results. The SXRD data revealed a structural transition induced by La to Sr substitution (I2/m <-> P2(1)/n). Moreover, it was not detected the presence of Fe2O3 on the samples obtained by the new route, which might be related to the absence of high temperature magnetic ordering. The magnetometry results indicated the emergence of Ir4+ with La doping, being corroborated by specific heat measurements which suggest Fe3+/Ir5+ and Fe3+/Ir4+ configurations for x = 0.0 and 0.8 compounds, respectively. Temperature dependent electrical resistivity measurements showed that Sr2+ to La3+ substitution leads to a decrease of electrical resistivity, possibly associated with the increase in the number of Ir valence electrons. (C) 2016 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 06/60440-0 - Study of strongly correlated systems in extreme conditions
Grantee:Carlos Rettori
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 07/50968-0 - Research into new materials involving intense magnetic fields and low temperatures
Grantee:Nei Fernandes de Oliveira Junior
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 12/04870-7 - Studies of novel complex and advanced materials
Grantee:Pascoal Jose Giglio Pagliuso
Support Opportunities: Research Projects - Thematic Grants