Low-temperature deposition of Li substituted (K,Na)NbO3 films by a hydrothermal method and their structural and ferroelectric properties

Takahisa Shiraishi, Yuta Muto, Yoshiharu Ito, Akinori Tateyama, Hiroshi Uchida, Takanori Kiguchi, Minoru K. Kurosawa, Hiroshi Funakubo, Toyohiko J. Konno

研究成果: Article査読

7 被引用数 (Scopus)

抄録

Li substituted (K,Na)NbO3 films with K-rich composition against polymorphic phase boundary were deposited at 240°C on (100)La:SrTiO3 substrates by hydrothermal method. The amount of Li content in films was controlled by changing the nominal composition of raw materials, A = [LiOH]/([KOH] + [NaOH] + [LiOH]). X-ray diffraction measurement showed that {001}c-oriented epitaxial (K,Na,Li)NbO3 films were obtained for all nominal compositions (A = 00.1). However, the diffraction peaks originated from a secondary phase were also detected in the range of A = 0.050.1. Plan-view scanning electron microscopy observation revealed that (K,Na,Li)NbO3 films possessed square-shape feature in accordance with the epitaxial relationship between film and substrate, while the secondary phase exhibited triangular- and pyramid-shaped features. The distribution of the elements across the thickness was investigated by time-of-flight secondary ion mass spectrometry. Transmission electron microscopy revealed the columnar structure of the film. In addition, nanoscale-pores have been found to exist in the boundary of each column by scanning transmission electron microscopy. (K,Na,Li)NbO3 films, A up to 0.03, showed ferroelectricity, and the maximum remanent polarization was observed at A = 0.01.

本文言語English
ページ(範囲)388-393
ページ数6
ジャーナルJournal of the Ceramic Society of Japan
127
6
DOI
出版ステータスPublished - 2019 6

ASJC Scopus subject areas

  • セラミックおよび複合材料
  • 化学 (全般)
  • 凝縮系物理学
  • 材料化学

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