1987 Fiscal Year Final Research Report Summary
Direct measutement of grain boundary conductivity of ionic conductor thick films composed of onr grain perpendicular to the film surface
| Project/Area Number |
61550582
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
無機工業化学
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| Research Institution | Muzashi Institute Technology |
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Principal Investigator |
MASAYUKI Nagai Musashi Institute of Technology, Faculty of Engineering. Associatr Professor, 工学部, 助教授 (80112481)
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| Co-Investigator(Kenkyū-buntansha) |
KAZUNICHI Yoshino the same as above, Lecturer, 工学部, 講師 (40061535)
TASASHI Sakurai the same as above,@lecturer, 工学部, 講師 (70061538)
TASASHI Nishino the same as above, professor, 工学部, 教授 (30061485)
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| Project Period (FY) |
1986 – 1987
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| Keywords | ionic conductor / hydroxyapatice / thick film / doctor blade method / electrical conductivity / atmospheric dependence |
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| Research Abstract |
Among a large number of ionic conductors, polycrystalline thick films of hydroexyapatite were mainly incestigated to clatify the eddect of the grain boundary and surface on the electrical conductivity. The reason for adopting hydroxyapatite is that it exhibits ionic conduction at elevated temperatures and can easily prepared in fine powder form. High purity and extremely fine powders were prepared by a conventional wet process under vatious conditions. The resultant powders were mixed with an organic vehicle and tape casted by the doctor blade method followed by sintering after decomposition and evapotration of the organic behicle. The film thickness of the sample was about 200 m and was found too large to make the film composed of one grain perpendicular to the film surface because it consisted of grains with less that 1 m diameter. Therefore, firect measurement of grain boundary conductivity could not be cattied out. However, atmospheric dependence ot the conductivity was found rematkable for porous samples when they were measured in himidified air ot air containing CO2. The samples without any treatment showed weak dependence while thosw with soaking treatment showed strong dependence. The effect was most significant when the sapmles were soaked in a solution containing C1ions. In particular, the conductivity was markeyldy sensitive to a samll amount of CO2 and thought to possess potential as a CO2 gas sensor.
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