High oxygen-pressure annealing effects on the ferroelectric and structural properties of PbZr0.3Ti0.7O3 thin films

Autor(es)

Escote, M. T. ; Pontes, F. M. ; Leite, E. R. ; Longo, E.

• Tipo de documento: Artigo Científico
• Fonte: Journal of Applied Physics; v. 96, n. 4, p. 2186-2191, ago. 2004.
• Área do conhecimento: Ciências Exatas e da Terra - Física
• Assunto(s): Filmes finos Ferroeletricidade Espectroscopia Raman Difração por raios X

Resumo

We report on the synthesis of polycrystalline thin films of PbZr0.3Ti0.7O3 (PZT) by the so-called chemical solution deposition technique. The thin films were deposited on Pt/Ti/SiO2/Si substrates by the spin-coating method, and were heat treateded at 700 °C in air and under several oxygen pressures (10<PO2<60 bars). The structural, morphological, and ferroelectric properties were characterized by x-ray diffraction (XRD), infrared and Raman spectroscopy, atomic force microscopy (AFM), and polarization-electric-field hysteresis loop measurements. The XRD and the Raman spectroscopy results revealed that the films heat treated in air and at low oxygen pressures (PO2<40 bars) are single phase. However, analysis of the data indicated a clear decreasing of the crystallization degree of the films with increasing oxygen pressure. AFM results showed the PZT films display a rosette structure embedded in a matrix, which comprises grains with an average grain size ranging from 60 to 120 nm. Ferroelectric hysteresis loops' measurements performed on these PZT films exhibited a clear decrease of the remnant polarization with increasing oxygen-pressure PO2. This study indicated some important effects of the high oxygen-pressure annealing on the physical properties of PZT thin films. (AU)

• Processo FAPESP: 99/10798-0 - Estudo de fenômenos intergranulares em óxidos cerâmicos
• Beneficiário: Reginaldo Muccillo
• Modalidade de apoio: Auxílio à Pesquisa - Temático