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Crystal structure, ferroelectric and piezoelectric properties of epitaxial (1−x)(Bi0.5Na0.5)TiO3-x(Bi0.5K0.5)TiO3 films grown by hydrothermal method
Ist Teil von
Japanese Journal of Applied Physics, 2020-08, Vol.59 (SP)
Ort / Verlag
IOP Publishing
Erscheinungsjahr
2020
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
The composition dependencies of crystal structure, and electrical and electromechanical properties were systematically investigated for epitaxial films of (1−x)(Bi0.5Na0.5)TiO3-x(Bi0.5K0.5)TiO3 [(1−x)BNT-xBKT (x = 0 -1)] deposited on (100)cSrRuO3//(100)SrTiO3 substrates by a hydrothermal method. An In-plane crystal lattice was clamped by that of underlying SrRuO3 irrespective of the x value. The dielectric constant decreased monotonously with increasing x. The polarization-electric field hysteresis loops were imprinted due to the preferential polarization in the films. In addition, the increase of tetragonality with increasing x value contributes to the increase of saturation and remnant polarization (Psat. and Pr, respectively), coercive field (Ec) as well as Pr/Psat. values. The effective piezoelectric coefficient (near E = 0 kV cm−1) improved considerably with increasing x, reaching a maximum of 62 pm V−1 in the BKT film. A comprehensive and systematic study has been performed on (1−x)BNT-xBKT epitaxial films in this work, which lays the foundation for further research of this system in the future.