Abstract
We report the relationship between grain shape and local piezoelectric coefficient (d33) hysteresis loops in a Bi-layered perovskite Bi3TaTiO9 (BTTO) thin film, fabricated via pulsed laser deposition. The BTTO thin film, deposited on a single-crystal Nb-doped SrTiO3 substrate, exhibited a polycrystalline structure with both elongated and round grains identified through atomic force microscopy. Local d33 hysteresis loops measurements in the BTTO thin film revealed that elongated grains exhibited higher d33 value compared to round grains. Intriguingly, the highest d33 value was measured at the areas where elongated and round grains are adjacent. These findings suggest that piezoelectricity is enhanced when a- and c-oriented crystallinity are present simultaneously in Bi-layered perovskite thin films. This observation parallels the phenomenon of phase coexistence observed near the morphotropic phase boundary in systems such as lead zirconate titanate.
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