高濃度アルコキシド溶液を用いたゾル-ゲル法によるBaTiO_3半導体セラミックスの低温合成と電気物性

概要

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Semiconducting donor(La)-doped barium titanate(BaTiO_3)ceramics were synthesized at 1100℃ in air by firing fine-grained crystalline gel powders of Ba-, La-, and Ti-alkoxides prepared by the sol-gel method. The ceramics showed resistivity of <10^3 Ω・cm at room temperature with an average grain size of 0.2-0.5 μm, which was one order of magnitude smaller than that sintered from conventional powder oxides. Moreover, in the La-doping concentration range of 0.2-0.7 at%, BaTiO_3 ceramics showed room temperature resistivity of<10^3 Ω・cm, though the value of PTCR jump was small(about one order)because no acceptor-type element was added. Early incorporation of La atoms in the BaTiO_3 lattice during the sol-gel processes may contribute to these results.
社団法人日本セラミックス協会の論文
1999-03-01