書誌事項
- タイトル別名
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- Development of PTCR Characteristic in Vacuum-Sintered BaTiO3-Based Ceramics by Addition of Partially Oxidized Ti Powder.
- ブブン サンカ Tiフン テンカ ニ ヨル BaTiO3キ セラミックス シンクウ ショウケツタイ ニ オケル PTCR トクセイ ノ ハツゲン
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抄録
The compact of the mixture composed of (Ba, Sr)TiO3 ceramics powder and partially oxidized Ti powder (5.0mass% O) which was named TiO2(Ti) powder was found to show PTCR characteristic, when the compact was sintered in vacuum at 1623 K for 3.6 ks, and then heated in air at 853 K for 0.3 ks. Some properties of the sintered compacts were investigated.<BR>The results obtained were as follows; (1)Obvious PTCR characteristic developed at TiO2(Ti) contents of 5-7vol%. (2)The transformation from tetragonal structure (ferroelectric phase) to cubic structure (paraelectric phase) of (Ba, Sr)TiO3 phase in the sintered and then annealed compact was suggested to occur only near the grain boundary and surface of the (Ba, Sr)TiO3 grains. (3)The dielectric constant ratio of ε ?? .540K/ε ?? t was 1/8, which was below the value (1/3) of (Ba, Sr)TiO3 air-sintered compact without TiO2(Ti), (4)The oxygen content of (Ba, Sr)TiO3 phase fairly decreased with increasing TiO2(Ti) content. (5)The densification and grain growth of the compact with 5-7vol% TiO2(Ti) hardly occured by the sintering. (6)The mechanism for the development of PTCR characteristic by the addition of TiO2(Ti) was discussed, based on Heywang-Jonker's model.
収録刊行物
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- 粉体および粉末冶金
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粉体および粉末冶金 46 (4), 348-357, 1999
一般社団法人 粉体粉末冶金協会
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詳細情報 詳細情報について
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- CRID
- 1390001206309312128
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- NII論文ID
- 10002262236
- 10003590793
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- NII書誌ID
- AN00222724
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- ISSN
- 18809014
- 05328799
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- NDL書誌ID
- 4701480
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可