Improvement of electrical properties of Sr-modified (Pb,Ca)TiO3 thin films grown by soft chemistry route

Autor(es)

Pontes, D. S. L. ^[1] ; Longo, E. ^[1] ; Pontes, F. M. ^[2] ; Galhiane, M. S. ^[2] ; Rissato, S. R. ^[2] ; Santos, L. S. ^[2] ; Leite, E. R. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, Inst Chem, BR-14801970 Sao Paulo - Brazil

^[2] Univ Estadual Paulista, Dept Chem, BR-17033360 Sao Paulo - Brazil

^[3] Univ Fed Sao Carlos, Dept Chem, LIEC CMDMC, BR-13565905 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS; v. 69, n. 8, p. 1951-1956, AUG 2008.
• Citações Web of Science: 2

Resumo

Strontium and calcium-modified lead titanate (Pb0.70Ca0.15Sr0.15)TiO3 soft chemistry-derived thin films were prepared on platinum-coated silicon substrate by spin-coating method. Investigations were made on the structure, surface morphology and electrical properties of the film. The results by XRD and FE-SEM showed that the film exhibits a pure tetragonal perovskite phase and an average grain size of about 50-60 nm, respectively. Electrical measurements of a metal-ferroelectric-metal type capacitor exhibited a stable and switchable electrical polarization in the film. The structure of the Au/PCST/Pt capacitor showed well-saturated hysteresis loops at an applied voltage of 300 kV/cm with remanent polarization and coercive field values of 22 mu C/cm(2) and 100 kV/cm, respectively. At 100 kHz, the dielectric constant and the dielectric loss of the (Pb0.70Ca0.15Sr0.15)TiO3 thin film with thickness 240 nm were 528 and 0.05, respectively. (C) 2008 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 06/51640-6 - Estudo sobre a cristalização de nanopartículas e nanofilmes cerâmicos ferroelétricos por micro-ondas e por forno de alta pressão
• Beneficiário: Debora da Silva Lima Pontes
• Modalidade de apoio: Bolsas no Brasil - Mestrado