Changes of PTCR Properties during Annealing in Reducing Gases in Nb(W)-Mn-Codoped BaTiO<sub>3</sub> Ceramics
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- ER Gang
- Department of Chemistry and Materials Technology, Kyoto Institute of Technology
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- ISHIDA Shingo
- Department of Chemistry and Materials Technology, Kyoto Institute of Technology
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- YAMAZAKI Kenji
- Department of Chemistry and Materials Technology, Kyoto Institute of Technology
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- TAKEUCHI Nobuyuki
- Department of Chemistry and Materials Technology, Kyoto Institute of Technology
Bibliographic Information
- Other Title
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- Nb(W)-Mnを共添加したBaTiO<sub>3</sub>の還元性雰囲気におけるPTCR特性の変化
- Nb W Mn オ キョウテンカシタ BaTiO3 ノ カンゲンセイ フンイキ
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Abstract
The degradation behaviors of Nb(W)-doped BaTiO3 and Nb(W)-Mn-codoped positive temperature coefficient of resistivity (PTCR) BaTiO3 during annealing in reducing gases were studied by measuring their electrical properties, diffuse reflectance and ESR spectroscopies. The decrease of PTCR effects during the annealing is consistent with the decrease of the grain-boundary resistivity and density of surface acceptor states, and the increase of conduction electrons. The results also indicated that durability to reducing-atmosphere of Nb(W)-Mn-codoped PTCR BaTiO3 was enhanced by adding Mn after calcination of the Nb(W)-doped BaTiO3 powders. It is assumed that Mn ions concentrated in the grain boundaries contribute to the enhancement of the durability to reducing-atmosphere by stabilizing the chemisorbed oxygens through Nb5+(W6+)-Mn pairs or forming high valence Mn (Mn3+, Mn4+) which trap electrons released from the chemisorbed oxygens. Thus Mn ions in grain boundaries suppress the lowering of the potential barrier during annealing in reducing-atmosphere.
Journal
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- Journal of the Ceramic Society of Japan
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Journal of the Ceramic Society of Japan 105 (1224), 675-680, 1997
The Ceramic Society of Japan
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Details 詳細情報について
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- CRID
- 1390282680255184128
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- NII Article ID
- 110002289337
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- NII Book ID
- AN10040326
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- ISSN
- 18821022
- 09145400
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- NDL BIB ID
- 4267830
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed