書誌事項
- タイトル別名
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- Effect of Ionic Polarization on Crystal Structure of Hydroxyapatite Ceramic with Hydroxide Nonstoichiometry
- ケッカン ドウニュウ ハイドロキシアパタイト ノ ケッショウ コウゾウ ニ オヨボス イオン ブンキョク ノ エイキョウ
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To provide bioelectrets with controlled electrical energy, the polarization characteristics of stoichiometric and nonstoichiometric hydroxyapatite (HA) ceramics were investigated in terms of crystal structures using Rietvelt analysis technique. HA ceramics with and without hydroxide ion defects were prepared at 1250°C for 2 h under streaming steam (for stoichiometric HA; w-HA) and air (for hydroxide-deficient HA; a-HA). Polarization of ceramics was done at 400°C for 1 h under a 5 kVcm-1 DC electrical field. Based on a result of thermally stimulated depolarization current (TSDC) measurement, the charge storage (Q) of polarized ceramics was significantly influenced by sintering atmosphere; Q value of a-HA was about 7 times larger than that of w-HA. Rietvelt analysis of XRD spectra suggests that a dipole formation of a-HA was probably due to the proton displacement form hydroxide ions to phosphate ions, while w-HA was likely polarized by proton migration between hydroxide ions. The dominant usage of phosphate ion as a proton localization site should contribute for the improvement of polarization property of a-HA.
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 57 (7), 520-528, 2010
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
- 1390282681284297216
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- NII論文ID
- 10026872100
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- NII書誌ID
- AN00222724
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- COI
- 1:CAS:528:DC%2BC3cXpslOhu7s%3D
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- ISSN
- 18809014
- 05328799
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- NDL書誌ID
- 10782753
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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
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- 使用不可