Fabrication of ferroelectric silicate KNbSi₂O₇ single crystal

• SAHASHI Akira

  Nano-Phononics Lab., Graduate School of Science and Engineering, Tokyo Institute of Technology

• HOSHINA Takuya

  Nano-Phononics Lab., Graduate School of Science and Engineering, Tokyo Institute of Technology

• TAKEDA Hiroaki

  Nano-Phononics Lab., Graduate School of Science and Engineering, Tokyo Institute of Technology

• TSURUMI Takaaki

  Nano-Phononics Lab., Graduate School of Science and Engineering, Tokyo Institute of Technology

Abstract

ABSi₂O₇ is a new ferroelectric material group of which ferroelectricity has been discovered recently. In this study, we focused on potassium niobate silicate (KNbSi₂O₇), which comprises displacement-type ferroelectric substance KNbO₃ and high-covalence substance SiO₂ in the structure. KNbSi₂O₇ single crystals with a size of 10 × 10 × 1 mm³ were fabricated by the process of glass crystallization, re-melting, and slow-cooling. The polarization-electric field (P-E) curve of the KNbSi₂O₇ crystal was evaluated and KNbSi₂O₇ evidently showed ferroelectricity in the direction of c axis. The value of the spontaneous polarization was estimated to 0.11 µC/cm². The dielectric permittivity was approximately 15 for both a and c axes at 1 MHz, and this material was found to be a ferroelectric material with low dielectric permittivity.

Journal

• Journal of the Ceramic Society of Japan

  Journal of the Ceramic Society of Japan 122 (1426), 389-392, 2014

  The Ceramic Society of Japan

Keywords

• KNbSi₂O₇
• Silicate
• Single crystal
• Ferroelectrics
• Dielectric property

Details

• CRID: 1390282680263966720
• NII Article ID: 130004480248
• DOI: 10.2109/jcersj2.122.389
• ISSN: 13486535
• ISSN: 18820743
• Web Site: https://www.jstage.jst.go.jp/article/jcersj2/122/1426/122_JCSJ-P13222/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed