Preparing And Structure Investigation On Ferroelectric Thin Films By Sol-Gel

Based on investigation of homogeneous compositional ferroelectric thin film, ferroelectric thin films were prepared with sol-gel process. By changing technics condition of preparation, experimentation that homogeneous compositional ferroelectric thin films were prepared with sol-gel process was searched. The structure and electrical properties of the thin films were systematically studied. Fresnoite (Ba2TiSi2O8, BTS), has been believed structurally to be a special piezoelectricity for its excellent piezoelectric, pyroelectric and nonlineoptic properties. BTS ferroelectric thin films were succeeded to prepare with sol-gel process in this article. The structure and properties of the thin films were systematically studied by available testing measure. It was evident that fresnoite had been formed in the thin films. At the same time the influences of different later heat treat condition to crystallinity were discussed. In this article, Ba2TiSi2O8ferroelectric thin films were prepared with sol-gel wet layer first time. Raman spectra and AFM micrographs show that the sol-gel-derived layer improves the crystallinty and morphology of the films. PbTiO3 is a kind of ferroelectric material that has typical perovskite structure. [(Pb1-xCax) TiO3, PCT(x)] is modified property by Ca2+ doping. Recently, great efforts had been made to prepare PCT ceramic and thin film. Calcium modified lead titanate solutions were synthesized using lead acetate tri-hydrate, calcium nitrate tetra-hydrate and titanium tetra- butyl as starting materials. (Pb0.76Ca0.24)TiO3 thin films were prepared with the solutions. The effect of different heat treats in tube furnace and rapid temperature annealing to the crystallinity and morphology were investigated.