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

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...

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Bibliographic Details
Published in:Journal of the Ceramic Society of Japan 2014/06/01, Vol.122(1426), pp.402-405
Main Authors: MATSUURA, Kohei, HOSHINA, Takuya, TAKEDA, Hiroaki, SAKABE, Yukio, TSURUMI, Takaaki
Format: Article
Language:English
Subjects:
Barium titanate
Barium titanates
Bonding
Ca substitution
Ceramics
Dopants
Electrical resistivity
Phases
Positive temperature coefficient of resistivity
Reducing atmospheres
Room temperature resistivity
Semiconducting ceramics
Titanium dioxide
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Summary: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.
ISSN:1882-0743
1348-6535
DOI:10.2109/jcersj2.122.402