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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.)

Photoluminescence activity of Ba1-xCaxTiO3: dependence on particle size and morphology

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Author(s):
Souza, Agda Eunice [1] ; Teixeira, Silvio Rainho [1] ; Morilla-Santos, Cassio [2] ; Schreiner, Wido Herwig [3] ; Lisboa Filho, Paulo Noronha [4] ; Longo, Elson [5]
Total Authors: 6
Affiliation:
[1] Univ Estadual Paulista, Fac Ciencias & Tecnol, Dept Fis Quim & Biol, Presidente Prudente, SP - Brazil
[2] Univ Fed Parana, Inst Tecnol Desenvolvimento LACTEC, BR-80060000 Curitiba, Parana - Brazil
[3] Univ Fed Parana, Dept Fis, BR-80060000 Curitiba, Parana - Brazil
[4] Univ Estadual Paulista, Fac Ciencias, Dept Fis, Bauru, SP - Brazil
[5] Univ Estadual Paulista, Inst Quim, Araraquara, SP - Brazil
Total Affiliations: 5
Document type: Journal article
Source: JOURNAL OF MATERIALS CHEMISTRY C; v. 2, n. 34, p. 7056-7070, 2014.
Web of Science Citations: 14
Abstract

It was shown that the higher photoluminescence emission of Ba1-xCaxTiO3 titanates is associated with the substitution of Ba by Ca, for the composition x = 0.75, which interferes with structural ordering, morphology and particle growth. Although the XRD data of this sample showed that the crystals do not exhibit long range order, FTIR, Raman and XPS confirmed the presence of Ti-O bonds in this sample, indicating the particle nucleation of titanates, but without growth and maintaining only short range order. These nanoparticles show perturbations in the symmetry of the unit cell, causing structural distortions, which result in changes in their electronic structure of atoms, destabilizing the whole lattice. This fact gives rise to points of intrinsic defects, changing the intermediate levels in the band gap, subsequently adding to the population of charge carriers and, consequently, radiative recombination with higher photoluminescence emission. (AU)

FAPESP's process: 08/57872-1 - National Institute for Materials Science in Nanotechnology
Grantee:Elson Longo da Silva
Support Opportunities: Research Projects - Thematic Grants
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