2018年2月1日
Electrical conductivity of polycrystalline hydroxyapatite and its application to electret formation
Solid State Ionics
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- 巻
- 315
- 号
- 開始ページ
- 19
- 終了ページ
- 25
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/j.ssi.2017.11.029
- 出版者・発行元
- Elsevier B.V.
Hydroxyapatite (HAp), a type of calcium phosphate found in bones and teeth, exhibits proton conductivity. In this study, its conductivity is investigated by measuring the complex permittivity of polycrystalline hydroxyapatite samples obtained via a sintering process. The dielectric dispersions measured from samples with different grain sizes are successfully explained using the Maxwell-Wagner interfacial polarization model. The results show that polycrystalline hydroxyapatite consists of both a high impedance grain boundary and a proton-conductive grain that has a conductivity of about 1.0 × 10− 7 S cm− 1 at 573 K. The interfacial polarization is confirmed using thermally stimulated depolarization current measurements. Additionally, electrets are prepared with the polycrystalline HAp via a poling process, and it is demonstrated that the electret formation is caused by the interfacial polarization.
- リンク情報
- ID情報
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- DOI : 10.1016/j.ssi.2017.11.029
- ISSN : 0167-2738
- SCOPUS ID : 85037368574