2013 Fiscal Year Final Research Report
Structural modulation of organic ferroelectrics under external fields
| Project/Area Number |
23340111
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | High Energy Accelerator Research Organization |
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Principal Investigator |
KUMAI Reiji 大学共同利用機関法人高エネルギー加速器研究機構, 物質構造科学研究所, 教授 (00356924)
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| Co-Investigator(Renkei-kenkyūsha) |
HORIUCHI Sachio 産業技術総合研究所, フレキシブルエレクトロニクス研究センター, グループ長 (30371074)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Keywords | 有機強誘電体 / X線回折 / 結晶構造解析 / 水素結合 / 電荷移動錯体 |
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| Research Abstract |
The origin of polarization in some organic ferroelectrics were revealed from structure analysis and diffraction study under external fields by using synchrotron radiation. In the case of acid-base type supramolecular ferroelectrics, it was elucidated that an enlargement of hydrogen-bond length is one of effective method for the improvement of ferroelectric properties. Furthermore, We find that the ferroelectric properties of organic charge-transfer type ferroelectric, TTF-CA, are governed by intermolecular charge transfer rather than simple displacement of static point charge on molecules. The observed polarization and poling effect on the absolute structural configuration can be interpreted in terms of electronic ferroelectricity, which not only exhibits antiparallel polarity to the ionic displacement but also enhances the polarization more than 20 times that of the point-charge model.
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