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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

A joint experimental and theoretical study on the electronic structure and photoluminescence properties of Al-2(WO4)(3) powders

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Author(s):
Batista, F. M. C. [1] ; La Porta, F. A. [2, 3] ; Gracia, L. [2, 3] ; Cerdeiras, E. [1] ; Mestres, L. [1] ; Li, M. Siu ; Batista, N. C. [4, 5] ; Andres, J. [3] ; Longo, E. [2] ; Cavalcante, L. S. [5]
Total Authors: 10
Affiliation:
[1] Univ Barcelona, Fac Quim, Dept Quim Inorgan, E-08028 Barcelona - Spain
[2] Univ Estadual Paulista, BR-14801907 Araraquara, SP - Brazil
[3] UJI, Dept Quim Fis & Analit, Castellon de La Plana 12071 - Spain
[4] Univ Sao Paulo, IFSC, BR-13560970 Sao Carlos, SP - Brazil
[5] Univ Estadual Piaui, CCN DQ GERATEC, BR-64002150 Teresina, PI - Brazil
Total Affiliations: 5
Document type: Journal article
Source: Journal of Molecular Structure; v. 1081, p. 381-388, FEB 5 2015.
Web of Science Citations: 12
Abstract

In this paper, aluminum tungstate Al-2(WO4)(3) powders were synthesized using the co-precipitation method at room temperature and then submitted to heat treatment processes at different temperatures (100, 200, 400, 800, and 1000 degrees C) for 2 h. The structure and morphology of the powders were characterized by means of X-ray diffraction (XRD), Rietveld refinement data, and field emission scanning electron microscopy (FE-SEM) images. Their optical properties were examined with ultraviolet-visible (UV-vis) diffuse reflectance spectroscopy and photoluminescence (PL) measurements. XRD patterns and Rietveld refinement data showed that Al2(W04)3Al(2)(WO4)(3) powders heat treated at 1000 C for 2 h have a orthorhombic structure with a space group (Pnca) without the presence of deleterious phases. FE-SEM images revealed that these powders are formed by the aggregation of several nanoparticles leading to the growth of microparticles with irregular morphologies and an agglomerated nature. UV-vis spectra indicated that optical band gap energy increased from 3.16 to 3.48 eV) as the processing temperature rose, which was in turn associated with a reduction in intermediary energy levels. First-principle calculations were (AU)

FAPESP's process: 09/50303-4 - Optical and photocatalytic properties of ZnMoO4 and ZnWO4
Grantee:Laécio Santos Cavalcante
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 12/18597-0 - Investigation of photoluminescent, photocatalytic and bactericide properties of (Ca1-xZnx)WO4 and (Ca1-xAg2x)WO4
Grantee:Marcio Aurélio Pinheiro Almeida
Support type: Scholarships in Brazil - Post-Doctorate