Structure and optical properties of [Ba(1-x)Y(2x/3)](Zr(0.25)Ti(0.75))O(3) powders
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
20/10/2012
20/10/2012
2010
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Resumo |
[Ba(1-x)Y(2x/3)](Zr(0.25)Ti(0.75))O(3) powders with different yttrium concentrations (x = 0, 0.025 and 0.05) were prepared by solid state reaction. These powders were analyzed by X-ray diffraction (XRD). Fourier transform Raman scattering (FT-RS), Fourier transform infrared (FT-IR) and X-ray absorption near-edge (XANES) spectroscopies. The optical properties were investigated by means of ultraviolet-visible (UV-vis) absorption spectroscopy and photoluminescence (PL) measurements. Even with the addition of yttrium, the XRD patterns revealed that all powders crystallize in a perovskite-type cubic structure. FT-RS and FT-IR spectra indicated that the presence of [YO(6)] clusters is able to change the interaction forces between the O-Ti-O and O-Zr-O bonds. XANES spectra were used to obtain information on the off-center Ti displacements or distortion effects on the [TiO(6)] clusters. The different optical band gap values estimated from UV-vis spectra suggested the existence of intermediary energy levels (shallow or deep holes) within the band gap. The PL measurements carried out with a 350 nm wavelength at room temperature showed that all powders present typical broad band emissions in the blue region. (C) 2010 Elsevier Masson SAS. All rights reserved. FAPESP[2009/50303-4] Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) CNPq Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) CAPES LNLS[D04B - XAFS1 - 8823] Brazilian Synchrotron Light Laboratory (LNLS) |
Identificador |
SOLID STATE SCIENCES, v.12, n.7, p.1160-1167, 2010 1293-2558 http://producao.usp.br/handle/BDPI/29877 10.1016/j.solidstatesciences.2010.04.002 |
Idioma(s) |
eng |
Publicador |
ELSEVIER SCIENCE BV |
Relação |
Solid State Sciences |
Direitos |
restrictedAccess Copyright ELSEVIER SCIENCE BV |
Palavras-Chave | #Ba(Zr,Ti)O(3) #Vacancies #Lattice defects #Band gap #Photoluminescence #ZIRCONIUM-TITANATE CERAMICS #FREE PIEZOELECTRIC CERAMICS #RAY-ABSORPTION SPECTRA #DIELECTRIC-PROPERTIES #THIN-FILMS #PHASE-TRANSITION #ROOM-TEMPERATURE #PHOTOLUMINESCENCE BEHAVIOR #ELECTRICAL-PROPERTIES #RELAXOR BEHAVIOR #Chemistry, Inorganic & Nuclear #Chemistry, Physical #Physics, Condensed Matter |
Tipo |
article original article publishedVersion |