Growth of epitaxial tetragonal (Bi,K)TiO3films and their ferroelectric and piezoelectric properties (original) (raw)

2016, Japanese Journal of Applied Physics

Bi,K)TiO 3 films were grown on (001) c SrRuO 3 // (100)SrTiO 3 substrates by pulsed laser deposition (PLD) at various temperatures. The K/Ti and Bi/Ti ratios of the films were almost the same at 350 and 500°C, but decreased markedly at 650°C. The ferroelectric property was ascertained for epitaxial tetragonal (Bi,K)TiO 3 films grown at 500°C from polarization-electric field relationships, and their saturation polarization (P sat) and coercive field (E c) at a maximum electric field of 800 kV/cm were 18 µC/cm 2 and 300 kV/cm, respectively. To improve the ferroelectric property, the films were heat-treated at 650°C while keeping the films in the PLD chamber after film deposition. These films also maintained a (001)-oriented epitaxy and had a tetragonal symmetry. The P sat and E c obtained at an electric field of 800 kV/cm were changed to 22 µC/cm 2 and 95 kV/cm, respectively. Moreover, these P sat and E c values increased to 31 µC/cm 2 and 165 kV/cm, respectively, at a maximum electric field of 1500 kV/cm. These heat-treated (Bi,K)TiO 3 films showed piezoelectricity with an apparent piezoelectric coefficient (d 33(AFM)) of 22 pm/V.

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