Investigation of structural and optical properties of CaTiO sub(3) powders doped with Mg super(2+) and Eu super(3+) ions

In this work, CaTiO sub(3) powders doped with Mg super(2+) ions and CaTiO sub(3) powders co-doped with Mg super(2+) and Eu super(3+) ions were prepared by the polymeric precursor method (PPM). These powders were characterized by different characterization techniques to study the influence of Mg supe...

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Bibliographic Details
Published in:Journal of alloys and compounds 2015-10, Vol.647, p.265-275
Main Authors: Oliveira, Larissa H, Savioli, Julia, de Moura, Ana P, Nogueira, Icamira C, Li, Maximo S, Longo, Elson, Varela, Jose A, Rosa, Ieda LV
Format: Article
Language:English
Subjects:
Calcium
Charge
Devices
Doping
Lighting
Optical properties
Perovskites
Titanium dioxide
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Summary:In this work, CaTiO sub(3) powders doped with Mg super(2+) ions and CaTiO sub(3) powders co-doped with Mg super(2+) and Eu super(3+) ions were prepared by the polymeric precursor method (PPM). These powders were characterized by different characterization techniques to study the influence of Mg super(2+) doping as well as Mg super(2+) and Eu super(3+) co-doping in structural and optical properties of CaTiO sub(3) perovskite-type structure. The Rietveld refinement and Micro-Raman analyses suggested the substitution Mg super(2+) and Eu super(3+) ions in the A-site of CaTiO sub(3) perovskite. The influence of Mg super(2+) doping can be detected by the displacement of calcium and oxygen atomic positions when compared to the non-doped CaTiOg powder. When Eu super(3+) 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 Ca sub(1-x)Mg sub(x)TiO sub(3) and Ca sub(1x)Mg sub(x/2)Eu sub(2y/3) TiO sub(3) 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.
ISSN:0925-8388
DOI:10.1016/j.jallcom.2015.05.226