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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.122  No.1426 (June) (2014)  >  pp.443-446

Journal of the Ceramic Society of Japan
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Fabrication of (K0.5Bi0.5)Bi4Ti4O15 ceramics and their electrical properties

Genta NISHIO1), Hajime NAGATA1), Tadashi TAKENAKA1)
1) Faculty of Science and Technology, Tokyo University of Science

(K0.5(1+x)Bi0.5)Bi4Ti4O15 [KBT-10000x, 10000x = (−200)–7] were prepared by the conventional ceramic fabrication process using the KHCO3 powder as the starting material. KBT-0 ceramic indicated high density ratio of higher than 95% and high resistivity of approximately 1012 Ω·cm. A remanent polarization Pr, and coercive field Ec, are 10.4 µC/cm2 and 70.8 kV/cm, respectively. Additionally, a high relative density ratio and resistivity exceeding 97% and approximately 1014 Ω·cm were obtained in K-poor KBT-(−100) ceramics derived from KHCO3. This ceramic also indicated good ferroelectric and piezoelectric properties such as Pr of 12.6 µC/cm2, piezoelectric constant d33 of 16.0 pC/N and the mechanical quality factor Qm of 2366, respectively.

Lead-free piezoelectric ceramics, Bismuth layer-structured ferroelectrics, Piezoelectric property

Received: December 15, 2013
Accepted: February 14, 2014 , Published online: June 01, 2014
Copyright © 2014 The Ceramic Society of Japan



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