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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.122  No.1426 (June) (2014)  >  pp.389-392

Journal of the Ceramic Society of Japan
<<Previous article Vol.122  No.1426 (June) (2014)   pp.389 - 392 Next article>>

Fabrication of ferroelectric silicate KNbSi2O7 single crystal

Akira SAHASHI1), Takuya HOSHINA1), Hiroaki TAKEDA1), Takaaki TSURUMI1)
1) Nano-Phononics Lab., Graduate School of Science and Engineering, Tokyo Institute of Technology

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.


Keyword:
KNbSi2O7, Silicate, Single crystal, Ferroelectrics, Dielectric property

Received: November 28, 2013
Accepted: January 11, 2014 , Published online: June 01, 2014
Copyright © 2014 The Ceramic Society of Japan

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