Investigation of Negative Charge Storage Mechanism in the Potassium Ion Electret by First-Principle Calculations
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- Nakanishi Toru
- Graduate School of Engineering, Nagoya University
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- Miyajima Takeshi
- Graduate School of Engineering, Nagoya University
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- Chokawa Kenta
- Institute of Materials and Systems for Sustainability, Nagoya University
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- Araidai Masaaki
- Institute of Materials and Systems for Sustainability, Nagoya University
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- Sugiyama Tatsuhiko
- Research Institute of Electronics, Shizuoka University
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- Hashiguchi Gen
- Research Institute of Electronics, Shizuoka University
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- Shiraishi Kenji
- Institute of Materials and Systems for Sustainability, Nagoya University
Bibliographic Information
- Other Title
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- カリウムイオンエレクトレットにおける負電荷蓄積機構の第一原理計算による検討
- カリウムイオンエレクトレット ニ オケル フデンカチクセキキコウ ノ ダイイチ ゲンリ ケイサン ニ ヨル ケントウ
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Abstract
<p>A potassium-ion electret, which is a key element of vibration-powered microelectromechanical generators, is a material that permanently stores negative charge. However, the charge storing mechanism of a potassium-ion electret is still unclear. In this study, we theoretically study the atomic and electronic structures of amorphous SiO2 with and without potassium atoms using first-principles molecular-dynamics calculations. As a result of calculations, we confirmed the existence of a fivefold-coordinated Si atom with five Si-O bonds as a characteristic local structure in a-SiO2 with potassium atoms, which is negatively charged. This result indicates that the fivefold-coordinated Si structure is the physical origin of the negative charge observed in potassium-ion electret. Furthermore, we show the guidelines for the experimental observation of the fivefold-coordinated structure and the fabrication of high-reliability potassium-ion electret.</p>
Journal
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- IEEJ Transactions on Sensors and Micromachines
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IEEJ Transactions on Sensors and Micromachines 141 (8), 292-298, 2021-08-01
The Institute of Electrical Engineers of Japan
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Keywords
Details 詳細情報について
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- CRID
- 1390851862122541440
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- NII Article ID
- 130008070405
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- NII Book ID
- AN1052634X
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- ISSN
- 13475525
- 13418939
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- NDL BIB ID
- 031639482
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed