Fabrication and PTC Properties of Lead-Free Element-Modified Barium Titanate Semiconducting Ceramics with T&lt;inf&gt;c&lt;/inf&gt;130°C

Takeda, Hiroaki; Harinaka, H.; Hoshi, Yoichiro; Kinoshida, T.; Nishida, Takashi; Uchiyama, Kiyoshi; Shimada, Takeshi; Katsuyama, Yoshiaki; Shiosaki, Tadashi

doi:10.1109/isaf.2007.4393408

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2011

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“…15) However, it was reported that the µ RT value gradually increases when the components are repeatedly heated in an air atmosphere. 16) This implies that the re-oxidation in grains must easily occur in an air atmosphere in the BTBNT ceramics fabricated in a low oxygen partial pressure.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of lead-free semiconducting ceramics using a BaTiO3-(Bi1/2Na1/2)TiO3 system by adding CaO

Tateishi

Hoshina

Takeda

et al. 2011

J. Ceram. Soc. Japan

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BaTiO 3 (Bi 1/2 Na 1/2 )TiO 3 (abbreviated as BTBNT) 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 BTBNT ceramics showed semiconducting behavior with the resistivity at room temperature µ RT = 10 3 ³ cm and a resistivity change near Curie temperature. Chemical composition analysis suggested that Ca 2+ acted as a donor by substituting for Na + in the BTBNT ceramics.

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Section: Introductionmentioning

confidence: 99%