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

Kohei MATSUURA; Takuya HOSHINA; Hiroaki TAKEDA; Yukio SAKABE; Takaaki TSURUMI

doi:10.2109/jcersj2.122.402

Papers

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

Kohei MATSUURA, Takuya HOSHINA, Hiroaki TAKEDA, Yukio SAKABE, Takaaki TSURUMI

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

JOURNAL FREE ACCESS

2014 Volume 122 Issue 1426 Pages 402-405

DOI https://doi.org/10.2109/jcersj2.122.402

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Abstract

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 ρ_RT 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 ρ_RT value in the ceramics.

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