Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 815, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.152427
Keywords
Coprecipitation method; Phase transition; XRD; XAS; DXAS; Magnetic properties
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Funding
- Brazilian agency Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior e Brasil (CAPES) [0011]
- Brazilian agency CNPq [455608/2014-8, 429996/2018-7, 152026/2016-9]
- Brazilian agency Foundation for Support to the Development of Scientific and Technological Actions and Research of the Rondonia State -FAPERO [005/2016-FAPERO/DCR/CNPq-01.1331.00033-00.11/2014]
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In this paper, the growth kinetic of RCrO3+gamma(R =Y, Pr, Nd, Gd and Dy; gamma = 0 or 1) compounds obtained by co-precipitation method is investigated by in-situ X-ray diffraction (XRD) and in-situ X-ray absorption near edge spectroscopy (XANES) using synchrotron radiation. A structural phase transition from RCrO4 (tetragonal structure and space group [41/amd) to perovskite RCrO3 (orthorhombic structure and space group Pbnm) is observed as a function of the heating temperature. In addition, the analysis of the in-situ Cr-K-edge)CANES spectra of precursor as a function of heating temperature are consistent with a change of oxidation state from Cr5+ to Cr3+. These results indicate that the temperature of the structural phase transition onset is dependent on the rare earth ion, which is also corroborated by thermogravimetric analysis (TGA). Moreover, magnetization measurements as a temperature function show ferromagnetic order for (Dy, Gd)CrO4 compounds, while (Nd, Pr)CrO4 and (Dy, Gd, Nd, Pr)CrO3 are antiferromagnetic with two magnetic phase transitions. These transitions are described as the highest temperature associated with the Cr-Cr antiferromagnetic order, while the other may be related to the magnetic order of the R-ions. (C) 2019 Elsevier B.V. All rights reserved.
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