Morphological and Structural changes of CaxSr1-xTiO3 Powders Obtained by the Microwave-Assisted Hydrothermal Method

Author(s)

Souza, Agda E. ^[1] ; Santos, Gleyson T. Almeida ^[1] ; Silva, Ranilson A. ^[1] ; Moreira, Mario L. ^[2] ; Volanti, Diogo P. ^[3] ; Paris, Elaine C. ^[4] ; Teixeira, Silvio R. ^[1] ; Longo, Elson ^[3]

Affiliation

^[1] Univ Estadual Paulista FCT Unesp, BR-19060080 Presidente Prudente, SP - Brazil

^[2] Univ Fed Sao Carlos UFSCar, LIEC, BR-13565905 Sao Carlos, SP - Brazil

^[3] Univ Estadual Paulista IQ Unesp, LIEC, BR-14800900 Araraquara, SP - Brazil

^[4] Univ Fed Paraiba UFPB, BR-58051900 Joao Pessoa, Paraiba - Brazil

• Document type: Journal article
• Source: International Journal of Applied Ceramic Technology; v. 9, n. 1, p. 186-192, JAN-FEB 2012.
• Web of Science Citations: 9

Abstract

CaxSr1-xTiO3 samples were synthesized by the microwave-assisted hydrothermal method. The X-ray diffraction results indicate that strontium calcium titanates powders show two crystalline structures: perovskite cubic and orthorhombic. The ultraviolet-visible spectra show that the band gap energies decrease with the Ca addition, suggesting imperfections or defects in the forbidden band of the titanates. The photoluminescence spectra show a broad band, which is usually observed at low temperatures in perovskite-type crystals. The nanoparticles show a nonuniform distribution with polyhedral morphology and spherical agglomerates, which change to faceted surfaces suggesting that the sample can reach other morphologies which ensure symmetry of lowest energy. (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