1999 Fiscal Year Final Research Report Summary
Formation Mechanism and In-situ Observation of Chemically Induced Formation Dynamics of Grain Boundary in Electro-ceramics
| Project/Area Number |
09450242
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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 |
Inorganic materials/Physical properties
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
MIZUTANI Nobuyasu Tokyo Institute of Technology, Faculty of Engineering, Professor, 大学院・理工学研究科, 教授 (60016558)
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| Co-Investigator(Kenkyū-buntansha) |
WAKIYA Naoki Tokyo Institute of Technology, Faculty of Engineering, Research Associate, 大学院・理工学研究科, 助手 (40251623)
SHINOZAKI Kazuo Tokyo Institute of Technology, Faculty of Engineering, Associate Professor, 大学院・理工学研究科, 助教授 (00196388)
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| Project Period (FY) |
1997 – 1999
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| Keywords | electroceramics / microstructure / liquid phase / grain boundary / thin film / varistor / zinc oxide / zirconium oxide |
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| Research Abstract |
In the field of electro-ceramics, the liquid phase sintering techniques are used frequently in order to manufacture many ceramic chips at lower temperature. However, the phenomena including property change and appearance of electronic function beside only sintering behavior have not been studied.
In this research, mainly the formation mechanism of grain boundary layer having different chemical constituent and structure with grain was studied on the point of chemical dynamics.
(1) Establishment of the detailed phase diagram of ZnO-PrOィイD22-xィエD2 system up to 1600℃
(2) The ZnO-PrOィイD22-xィエD2 system has no solid solution region and one eutectic point at 1328℃.
(3) By addition of CoO, the liquidous temperature decresed to 1280℃.
(4) The state of liquid phase in grain boundaries changed strongly with oxygen pressure.
(5) By infilutration of PrOィイD22-xィエD2 to grain boundary region from the surface of pure ZnO sintered body, the good varisor wag formed.
Through this study, we discussed the role of liquid phase to appearance of properties, etc. from the view point of chemical formation of grain boundary
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