期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 117, 期 1, 页码 192-198出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2009.05.042
关键词
Optical materials; Chemical synthesis; XAFS; Luminescence
资金
- CAPES
- CNPq
- EAPESP
- LNLS [D04B - XAFS1 - 8050]
MgTiO3 powders were prepared by the complex polymerization method and heat treated at different temperatures for 2 h. These powders were analyzed by X-ray diffraction (XRD), Rietveld refinements, micro-Raman (MR) spectroscopy, X-ray absorption near edge spectroscopy (XANES), ultraviolet-visible (UV-vis) absorption spectroscopy and photoluminescence (PL) measurements. XRD patterns and MR spectra showed that the crystalline powders have a rhombohedral structure. XANES spectra indicated that the local structure of crystalline MgTiO3 powders is composed only by [TiO6] clusters, while the disordered exhibit the simultaneous presence of both [TiO5]and [TiO6] complex clusters into the lattice. UV-vis spectra revealed different optical band gap values as a function of heat treatment temperature. This result can be an indicative of intermediary energy levels within the band gap of this material because of structural defects into the perovskite-type structure. PL behavior was attributed to the structural order-disorder and/or distortions on the [TiO6]-[TiO6] complex clusters. (c) 2009 Elsevier B.V. All rights reserved.
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