dc.contributor | Universidade Estadual Paulista (Unesp) | |
dc.contributor | Universidade Federal de São Carlos (UFSCar) | |
dc.contributor | Natl Inst Technol | |
dc.contributor | Birla Inst Technol | |
dc.contributor | Universidade de São Paulo (USP) | |
dc.date.accessioned | 2014-05-20T15:32:09Z | |
dc.date.accessioned | 2022-10-05T17:08:42Z | |
dc.date.available | 2014-05-20T15:32:09Z | |
dc.date.available | 2022-10-05T17:08:42Z | |
dc.date.created | 2014-05-20T15:32:09Z | |
dc.date.issued | 2010-07-01 | |
dc.identifier | Solid State Sciences. Amsterdam: Elsevier B.V., v. 12, n. 7, p. 1160-1167, 2010. | |
dc.identifier | 1293-2558 | |
dc.identifier | http://hdl.handle.net/11449/41132 | |
dc.identifier | 10.1016/j.solidstatesciences.2010.04.002 | |
dc.identifier | WOS:000280381200021 | |
dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/3912061 | |
dc.description.abstract | [Ba1-xY2x/3](Zr0.25Ti0.75)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 [YO6] 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 [TiO6] 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. | |
dc.language | eng | |
dc.publisher | Elsevier B.V. | |
dc.relation | Solid State Sciences | |
dc.relation | 1.861 | |
dc.relation | 0,574 | |
dc.rights | Acesso restrito | |
dc.source | Web of Science | |
dc.subject | Ba(Zr,Ti)O-3 | |
dc.subject | Vacancies | |
dc.subject | Lattice defects | |
dc.subject | Band gap | |
dc.subject | Photoluminescence | |
dc.title | Structure and optical properties of [Ba1-xY2x/3](Zr0.25Ti0.75)O-3 powders | |
dc.type | Artigo | |