Fabrication of lead-free semiconducting ceramics using a BaTiO3–(Bi1/2Na1/2)TiO3 system by adding CaO
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概要
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BaTiO3–(Bi1/2Na1/2)TiO3 (abbreviated as BT–BNT) solid solution semiconducting ceramics, as a candidate for a lead-free PTC (Positive Temperature Coefficient of resistivity) thermistor usable over 130°C, were synthesized by adding CaO into the calcined powder. The CaO added BT–BNT ceramics showed semiconducting behavior with the resistivity at room temperature ρRT = 103 Ω cm and a resistivity change near Curie temperature. Chemical composition analysis suggested that Ca2+ acted as a donor by substituting for Na+ in the BT–BNT ceramics.
著者
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Hoshina Takuya
The Graduate School Of Sci. And Engineering Tokyo Inst. Of Technol.
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Takeda Hiroaki
Graduate School of Science and Technology, Tokyo Institute of Technology
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Hoshina Takuya
Graduate School Of Science And Engineering Tokyo Institute Of Technology
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Hoshina Takuya
Department Of Metallurgy And Ceramics Science Tokyo Institute Of Technology
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Tsurumi Takaaki
Graduate School Of Science And Engineering Tokyo Institute Of Technology
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Takeda Hiroaki
Graduate School Of Materials Science Nara Institute Of Science And Technology (naist)
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TATEISHI Takashi
Graduate School of Science and Technology, Tokyo Institute of Technology
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TSURUMI Takaaki
Graduate School of Science and Technology, Tokyo Institute of Technology
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Takeda Hiroaki
Graduate School of Material Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama-cho, Ikoma, Nara 630-0192, Japan
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HOSHINA Takuya
Graduate School of Science and Technology, Tokyo Institute of Technology
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Tsurumi Takaaki
Graduate School of Materials Science and Technology, Tokyo Institute of Technology, Meguro, Tokyo 152-8552, Japan
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