STRUCTURE AND PHASE-TRANSITIONS OF PB1-XCAXTIO3 THIN-FILMS

Thin ferroelectric films of Pb1-xCaxTiO3 (0 < x less than or equal to 0.4) solid solutions were produced on glass, glass-ceramic, and MgO su bstrates by centrifuging solutions of metalorganic compounds, followed by thermal decomposition of the precursors. The lattice parameters of the solid solutions were measured as a function of composition. The x = 0.15 film was found to undergo a tetragonal-to-cubic phase transiti on at 370 degrees C and an isostructural transformation between two te tragonal phases at 170 degrees C. The absorption spectra of the films were measured in the visible and near-IR spectral regions. Increasing Ca content reduces internal stress and has no effect on the temperatur e of the isostructural phase transition.