Abstract
A new lead-free piezoelectric film consisting of Sr2NaNb4O13 − (SNNO−) and TiNbO5 − (TNO−) nanosheets was fabricated via electrophoresis. SNNO and TNO films display paraelectric polarization versus electric field (P-E) loops. However, a new film composed of a mix of SNNO− and TNO− (S/T) nanosheets displayed a ferroelectric P-E hysteresis loop with large maximum polarization (18.7 μC/cm2), remnant polarization (7.7 μC/cm2), and a coercive electric field (86 kV/cm). The interfaces formed between the SNNO and TNO layers induced ferroelectric properties in the S/T film through the occurrence of polar distortion and octahedral tilting in the film. Ferroelectric properties were also observed in piezoelectric force microscopy images of the S/T film, which showed 90° domains after the removal of the applied electric field. The dielectric constant of the S/T film was 70, which is higher than those of SNNO and TNO films, indicating that the S/T film is a ferroelectric material. The piezoelectric strain constant of the S/T film was 156 p.m./V and promising insulating properties were observed therein. The growth temperature of the S/T film was low (300 °C), suggesting that the S/T film can be used for flexible electronic devices.
Original language | English |
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Journal | Ceramics International |
DOIs | |
Publication status | Published - 2019 Jan 1 |
Keywords
- Electrophoresis
- Lead-free piezoelectric film
- Low-temperature process
- Metal-oxide nanosheets
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Process Chemistry and Technology
- Surfaces, Coatings and Films
- Materials Chemistry