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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.122  No.1426 (June) (2014)  >  pp.402-405

Journal of the Ceramic Society of Japan
<<Previous article Vol.122  No.1426 (June) (2014)   pp.402 - 405 Next article>>

Effects of Ca substitution on room temperature resistivity of donor-doped barium titanate based PTCR ceramics

Kohei MATSUURA1), Takuya HOSHINA1), Hiroaki TAKEDA1), Yukio SAKABE1), Takaaki TSURUMI1)
1) Graduate School of Science and Technology, Tokyo Institute of Technology

Barium titanate based semiconducting ceramics were synthesized using Ca2+ and La3+ as dopants, TiO2, SiO2 and MnO as sintering aids, and various firing process. The Ca2+ contained ceramics without impurity phases, sintered in reducing atmosphere and subsequent annealing in air, showed both the PTCR (Positive Temperature Coefficient of Resistivity) behavior and low room temperature resistivity ρRT 2.2 Ω cm. Based on knowledge of ionization energy and bond disassociation energy, it was cleared that Ca substitution plays an important role in lowering the ρRT value in the ceramics.


Keyword:
Barium titanate, Positive temperature coefficient of resistivity, Semiconducting ceramics, Ca substitution, Room temperature resistivity

Received: December 13, 2013
Accepted: January 24, 2014 , Published online: June 01, 2014
Copyright © 2014 The Ceramic Society of Japan

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