New lead-free piezoelectric thin film fabricated using metal-oxide nanosheets at low temperature

Mir Im, Woong Hee Lee, Sang Hyo Kweon, Sahn Nahm

Research output: Contribution to journalArticle

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 languageEnglish
JournalCeramics International
DOIs
Publication statusPublished - 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

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