Ferroelectric and optical properties of Ba0.8Sr0.2TiO3 thin film
Carregando...
Data
2002-05-01
Autores
Pontes, F. M.
Leite, E. R.
Pontes, DSL
Longo, Elson [UNESP]
Santos, EMS
Mergulhao, S.
Pizani, P. S.
Lanciotti, F.
Boschi, T. M.
Varela, José Arana [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
American Institute of Physics (AIP)
Resumo
Barium strontium titanate (Ba0.8Sr0.2TiO3) thin films have been prepared on Pt/Ti/SiO2/Si substrates using a soft solution processing. X-ray diffraction and also micro-Raman spectroscopy showed that the Ba0.8Sr0.2TiO3 thin films exhibited a tetragonal structure at room temperature. The presence of Raman active modes was clearly shown at the 299 and 725 cm(-1) peaks. The tetragonal-to-cubic phase transition in the Ba0.8Sr0.2TiO3 thin films is broadened, and suppressed at about 35 degreesC, with a maximum dielectric constant of 948 (100 kHz). Electrical measurements for the prepared Ba0.8Sr0.2TiO3 thin films showed a remnant polarization (P-r) of 6.5 muC/cm(2), a coercive field (E-c) of 41 kV/cm, and good insulating properties. The dispersion of the refractive index is interpreted in terms of a single electronic oscillator at 6.97 eV. The direct band gap energy (E-g) and the refractive index (n) are estimated to be 3.3 eV and n = 2.27-2.10, respectively. (C) 2002 American Institute of Physics.
Descrição
Palavras-chave
Como citar
Journal of Applied Physics. Melville: Amer Inst Physics, v. 91, n. 9, p. 5972-5978, 2002.