Role of fluorite phase formation in the texture selection of sol-gel-prepared Pb(Zr1−x, Tix)O3 films on Pt electrode layers

摘要: Transmission electron microscopy-selected area diffraction studies were performed on as-pyrolyzed sol-gel-derived Pb(Zr 1 - x , Ti )O 3 films deposited Pt electrode layers to elucidate the structural cause behind large effects of pyrolysis conditions orientation selection [L. Fe, G.J. Norga, H.E. Maes, and G. J. Mater. Res. 16, 2499 (2001)]. The crystallinity intermediate pyrochlore phase, which forms during pyrolysis, was found strongly depend conditions. Specifically, for 10 s at 350 °C seen result in conversion film a well-crystallized, oxygen-deficient phase with fluorite crystal structure (disordered pyrochlore). We speculate that formation metastable is favored by reduced oxygen partial pressure, caused burnoff residual acetates. Longer times and/or higher temperatures quasi-amorphous phase. presence well-crystallized pyrolyzed (11 )-oriented after crystallization, while consisting turn out (100) or mixed (100)/(111) oriented crystallization. An explanation observed effects, basis different surface energetics versus perovskite oxides, proposed.