| Project/Area Number |
09640407
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
固体物性Ⅰ(光物性・半導体・誘電体)
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| Research Institution | Teikyo University |
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Principal Investigator |
ABE Kiyoshi Teikyo University, Faculty of Pharmaceutical Sciences, Rresearch Associate, 薬学部, 助手 (70159424)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 1998: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1997: ¥2,600,000 (Direct Cost: ¥2,600,000)
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| Keywords | SC (NH_2) _2 / K_2ZnCl_4 / NaNO_2 / domain sturacture / etching / SEM / cold stage / secondary electron eficency / K_2ZmCl_4 / N_aNO_2 / 強誘導体 / 分域構造 / 亜硝酸ナトリウム / チオ尿素 / TGS / ジュールートムソン効果 |
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| Research Abstract |
1 We thought the reason why a SEM observation of ferroelectric domain structure induces the disappearance of the contrast is the occurance of polarization reversal caused by the charging effect of specimen. Then we attempted to observe domain structure by SEM at low temperature where the coercive field becomes strong, and examined the decrease of the polarization reversal caused by charging. The following is this result. The cause was not occurrence of a polarization reversal, but was the difference of the secondary electron efficiency in positive and negative domains. This fact suggest that if we want to observe ferroelctric domain patterns by SEM, we must change the usage of SEM.
2 We succeeded in observing the domain structure in ferroelectric thiourea, SC(NH_2) _2, by a SEM which equipped with cold stage system. The observed domain structure was similar to one in ferroelectric sodium nitrite and the minimum width of the confirmed domain was 0.2 mu m.
3 A SEM Observation of etched surface has already been carried out in NaNO_2, We applied this technique to K_2ZnCl_4 to examine the process of domain patterns coarsening. We found that acetone is excellent etchant of this sample and the resolving power of this etching is still a micron order at present. If the resolving power is improved a little we can use a SEM to observation and examine the initial process of domain pattern coasening.
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