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BIBTEX RIS

Investigation of structural and optical properties of CaTiO3 powders doped with Mg2+ and Eu3+ ions

2015; Elsevier BV; Volume: 647; Linguagem: Inglês

10.1016/j.jallcom.2015.05.226

ISSN

1873-4669

Autores

Larissa H. Oliveira, Julia Savioli, Ana P. de Moura, I.C. Nogueira, Máximo Siu Li, E. Longo, José Manuel Rey Varela Rey Varela, Ieda L. V. Rosa,

Tópico(s)

Ferroelectric and Piezoelectric Materials

Resumo

In this work, CaTiO3 powders doped with Mg2+ ions and CaTiO3 powders co-doped with Mg2+ and Eu3+ ions were prepared by the polymeric precursor method (PPM). These powders were characterized by different characterization techniques to study the influence of Mg2+ doping as well as Mg2+ and Eu3+ co-doping in structural and optical properties of CaTiO3 perovskite-type structure. The Rietveld refinement and Micro-Raman analyses suggested the substitution Mg2+ and Eu3+ ions in the A-site of CaTiO3 perovskite. The influence of Mg2+ doping can be detected by the displacement of calcium and oxygen atomic positions when compared to the non-doped CaTiO3 powder. When Eu3+ ions are added to the A-site of this perovskite the excess of positive charge can be compensated by the formation of calcium vacancies. Luminescence data showed that Ca1-xMgxTiO3 and Ca1xMgx/2Eu2y/3TiO3 powders are potential materials for fabrication of lighting devices based on near-UV and blue LED using an excitation wavelength of 397 and/or 450 nm.

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