2009 Fiscal Year Final Research Report
Investigation on the segregation behavior of rare-earth ions at the silicon nitried-grain boundary phase interface
| Project/Area Number |
19560684
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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 |
Inorganic materials/Physical properties
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| Research Institution | Fukuoka Institute of Technology |
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Principal Investigator |
KITAYAMA Mikito Fukuoka Institute of Technology, 工学部, 教授 (10330945)
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| Project Period (FY) |
2007 – 2009
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| Keywords | 窒化ケイ素 / 粒界 / 界面 / 希土類イオン / 偏析 |
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| Research Abstract |
As the sintering additive, La and Lu oxides that have the largest and the smallest, respectively, ionic radii among the lanthanide were selected. Silicon nitride sintered bodies were fabricated using the composition of (1-x)La_2O_3+xLu_2O_3(x=0, 0.1, 0.2, 0.3, …, 1), and their activation energies of the…transformation were determined. It was found that the energy value of x=0.3 was close to the one of x=1, which strongly suggests that rare-earth elements with small ionic radii would bond more strongly at the silicon nitried grain boundary interface.
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