2000 Fiscal Year Final Research Report Summary
Realization of High-Reliable Thin Film Capacitor by Anodizing A1- Transition Metal Intermetallic Compounds
| Project/Area Number |
10650299
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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 |
Electronic materials/Electric materials
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| Research Institution | Kitami Institute of Technology |
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Principal Investigator |
SASAKI Katsutaka Faculty of Engineering Kitami Institute of Technology Prof., 工学部, 教授 (80091552)
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| Co-Investigator(Kenkyū-buntansha) |
YANAGISAWA Hideto Faculty of Engineering Kitami Institute of Technology Res.Asso., 工学部, 助手 (70158020)
ABE Yoshio Faculty of Engineering Kitami Institute of Technology Asso.Prof., 工学部, 助教授 (20261399)
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| Project Period (FY) |
1998 – 2000
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| Keywords | high reliable capacitor / anodized film / Al_3Hf compound / Al_3Zr compound / Al_3Ta compound / heat-proof property / high permitivity / low loss property |
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| Research Abstract |
Generally, many stoichiometric intermetallic compounds exhibit high hardeness and high thermal stability at high temperatures. It is then expected that thin film capacitors with high heat-proof properties and low loss properties can be realized by anodizing stoichiometric and low-resistive intermetallic compounds composed of valve metals which are able to anodize. In addition, if intermetallic compounds which are composed of Al and Hf, Zr and Ta are anodized, we expect that high permitivity capacitor can be realized because the dielectric constans of Hf, Zr and Ta oxides are relatively large. Therefore, we prepared the intermetallic compound films of Al_3Hf, Al_3Zr and Al_3Ta by co-sputtering method, and examined the capacitor properties, leakage current and the heat-proof properties of these anodized capacitors. Following results were obtained.
(1) The heat-proof properties of these anodized capacitors were superior to that of Ta anodized capacitor which has been widely used to date. (2) The dielectric constant of Al_3Ta capacitor among these capacitors was the highest. (3)The best heat-proof property could be obtained by using Al_3Hf capacitor, while the initial capacitor properties of Al_3Zr was the best. (4) The difference of the polarity on the leakage current was not recognized in these three anodized capacitors.
Therefore, it is concluded that the thin film capacitors prepared by anodizing Al-transition metal intermetallic compounds are one of the most promising mothods to realize high reliable thin film capacitors.
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