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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.)

Effect of the pH pre-adjustment on the formation of In(2)W(3)O(12 )and In6WO12 powders: Cluster coordination and optical band gap

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Author(s):
de Paiva, Rafael Texeira [1] ; Nogueira, Icamira Costa [2] ; Sczancoski, Julio Cesar [3] ; Lemos, Pablo Santana [3] ; Elias Matos, Jose Milton [1] ; Santos, Reginaldo Silva [4] ; Longo, Elson [5] ; Cavalcante, Laecio Santos [1, 4]
Total Authors: 8
Affiliation:
[1] Univ Fed Piaui, Programa Posgrad Ciencia Mat PPCM, BR-64049550 Teresina, PI - Brazil
[2] ICE Univ Fed Amazonas, Ave Rodrigo Otavio Japiim, POB 670, BR-69077000 Manaus, Amazonas - Brazil
[3] Univ Fed Sao Carlos, DQ UFSCar, POB 676, BR-13565905 Sao Carlos, SP - Brazil
[4] Univ Estadual Piaui, PPGQ GERATEC, Joao Cabral 2231, POB 381, BR-64002150 Teresina, PI - Brazil
[5] Univ Estadual Paulista, Dept Quim Fis, BR-14800060 Araraquara, SP - Brazil
Total Affiliations: 5
Document type: Journal article
Source: BOLETIN DE LA SOCIEDAD ESPANOLA DE CERAMICA Y VIDRIO; v. 59, n. 1, p. 2-14, JAN-FEB 2020.
Web of Science Citations: 0
Abstract

In this communication, diindium tristungstate (In2W3O12) and hexaindium tungstate (In6WO12) powders were synthesized by the co-precipitation method at different pH values and heat treatment at 1073 K for 2 h. X-ray diffraction patterns and Rietveld refinements were employed to analyze the long-range structural ordering as well as quantify the presence crystallographic phases, respectively. All powders obtained in pH ranging from 2 to 3.5 exhibited a mixture of In2W3O12 and gamma-tungsten oxide (gamma-WO3) phases. When prepared at pH close to 4, the powders presented both In2W3O12 and In6WO12 phases. All these crystalline structures were simulated in a three-dimensional visualization program by adopting the Rietveld refinements analysis as input data. The ultraviolet-visible spectra were employed to estimate the optical band gap energy of all powders for the first time. (C) 2019 Published by Elsevier Espana, S.L.U. on behalf of SECV. (AU)

FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 12/14004-5 - Investigation of the photoluminescence and photocatalytic properties of pure and Mn, Cu, and Zn-doped BaWO4 and BaMoO4 powders
Grantee:Júlio César Sczancoski
Support Opportunities: Scholarships in Brazil - Post-Doctoral