resumo
The synthesis of Y1-x/2MgxV1-x/2O4-delta (MgxYV) (x = 0.0-0.5) by solid state reaction technique is reported. This preparation method is compared with chemical synthesis method such as nitrate-citrate auto-combustion route. The crystal structure and the surface morphology of the samples were determined by X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) techniques, respectively. Substantial decrease in phase formation temperature was observed for combustion method. The solubility limit of Mg in YVO4 lattice was found to be low i.e., x <= 0.1. The temperature dependence of conductivity of MgxYV samples indicated an increase in ionic conductivity values compared to the parent YVO4 due the formation of oxygen ion vacancies produced by the incorporation of acceptor Mg cations. Combustion-synthesized MgxYV samples showed higher conductivity compared to the samples prepared by conventional solid state reaction. (C) 2016 Elsevier B.V. All rights reserved.
palavras-chave
OXIDE-ION CONDUCTIVITY; CONDUCTORS; SR; MG; CA; ELECTROLYTES; TRANSPORT; EPR
categoria
Chemistry; Materials Science; Metallurgy & Metallurgical Engineering
autores
Gayathri, TH; Yaremchenko, AA; Zakharchuk, K; James, J
nossos autores
Aleksey Yaremchenko
Investigador Principal
Kiryl Zakharchuk
Estudante de doutoramentoProjectos
agradecimentos
T. H. Gayathri, thanks the Council of Scientific and Industrial Research for her research fellowship. The authors thank Dr. K. P. Surendran and Mr. M. R. Chandran of CSIR-NIIST and Dr. T. Premkumar of CSIR-CECRI for their help. A. A. Yaremchenko and K. Zakharchuk would like to acknowledge support from the FCT, Portugal (project IF/01072/2013/CP1162/CT0001 and project CICECO - Aveiro Institute of Materials POCI-01-0145-FEDER-007679 (FCT ref. UID/CTM/50011/2013) financed by national funds through the FCT/MEC and when applicable co-financed by FEDER under the PT2020 Partnership Agreement).