Structural investigation and improvement of photoluminescence properties in Ba(ZrxTi1-x)O-3 powders synthesized by the solid state reaction method

Autor(es)

Parida, S. ^[1] ; Rout, S. K. ^[1] ; Cavalcante, L. S. ^{[2, 3]} ; Simoes, A. Z. ^[3] ; Barhai, P. K. ^[1] ; Batista, N. C. ^[2] ; Longo, E. ^[3] ; Li, M. Siu ^[4] ; Sharma, S. K. ^[5]

Afiliação do(s) autor(es)

^[1] BIT Mesra, Dept Appl Phys, Electroceram Lab, Ranchi 835215, Jharkhand - India

^[2] Univ Estadual Piaui, Dept Quim, CCN, BR-64002150 Teresina, PI - Brazil

^[3] Univ Estadual, BR-14801907 Araraquara Guaratingueta, SP - Brazil

^[4] Univ Sao Paulo, IFSC, BR-13560970 Sao Carlos, SP - Brazil

^[5] ISM, Dept Phys, Dhandad, Jharkhand - India

• Tipo de documento: Artigo Científico
• Fonte: Materials Chemistry and Physics; v. 142, n. 1, p. 70-76, OCT 15 2013.
• Citações Web of Science: 13

Resumo

In this paper, Ba(ZrxTi1-x)O-3 powders with different (x) compositions were synthesized by the solid state reaction method and their structure and improvement of photoluminescence (PL) properties with the Ti substitution by Zr were discussed. The structural investigation of these powders was performed by means of X-ray diffraction (XRD) and Fourier transform Raman (FT-Raman) spectroscopy. Their optical properties were monitored by ultraviolet-visible (UV-vis) absorption spectroscopy and PL measurements. XRD patterns indicated that the powders with x = 0 and 0.1 have a tetragonal structure while compositions with x >= 0.2 exhibit cubic structure. FT-Raman spectra revealed that the replacement of Ti by Zr significantly reduced the intensity of the Raman active modes. This behavior is related to the increase of undistorted {[}ZrO6] clusters in the global matrix at short range and decrease in local concentration of distorted octahedral {[}TiO6] clusters. UV- vis absorption spectra shown the presence of intermediary energy levels between the valence band (VB) and the conduction band (BC). These intermediary electronic levels are mainly related to 2p orbitals of O atoms, 4d orbitals of Zr atoms and 3d orbitals of Ti atoms between the VB and CB. A significant improvement in PL properties of Ba(ZrxTi1-x)O-3 powders was observed with an increase of undistorted {[}ZrO6] clusters in the lattice. Finally, we propose possible wideband models based on intermediary energy deep and shallow levels to explain the PL behavior at room temperature. (C) 2013 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 09/50303-4 - Propriedades ópticas e fotocatalíticas do ZnMoO4 e ZnWO4
• Beneficiário: Laécio Santos Cavalcante
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado