PROPERTIES OF HIGHLY (100)-ORIENTED THIN-FILMS OF SOL-GEL DERIVED PB[(MG1/3NB2/3)(X)TI-1-X]O-3 ON (100)-TEXTURED LANIO3 ELECTRODE

The sol-gel derived Pb[(Mg1/3Nb2/3)(x)Ti-1-x]O-3 (PMNT) thin films of x = 0.5-1.0 were prepared on (111)-textured Pt and (100)-textured LaNiO3 electrodes. Randomly oriented PMNT films were obtained by deposition on the Pt electrode. However, highly (100)-oriented PMNT films were formed on the LNO electrode, and a reduction of the perovskite phase formation temperature was also achieved. The (100)-oriented PMNT films showed a change of crystallographic anisotropy of dielectric and ferroelectric properties with respect to the change of composition. The compositions of cubic or rhombohedral phase had a lower permittivity and a less steep P-E hysteresis behavior compared to the films on Pt of the same composition, but that of tetragonal phase had a higher permittivity and a steeper P-E hysteresis loop. In general, the films on LNO exhibited a relatively higher dielectric loss and a broader hysteresis loop.