| Project/Area Number |
09355021
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | Toyota Technological Institute |
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Principal Investigator |
IKUSHIMA Akira J. Toyota Technological Institute, Granduate School of Engineering, professor, 工学研究科, 教授 (10029415)
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| Co-Investigator(Kenkyū-buntansha) |
FUJIOKA Kazuhiko Nippon Silica Glass Co.Ltd., senior researcher, 技術課長
MATSUYAMA Toyokazu Toshiba Ceramics, Inc.senior researcher, 主任研究員
ITO Tadashi Toyota Central R&D Laboratories, Inc., senior researcher, 主任研究員
SAITO Kazuya Toyota Technological Institute, Granduate School of Engineering, lecturer, 工学研究科, 講師 (20278394)
FUJIWARA Takumi Toyota Technological Institute, Granduate School of Engineering, associate profe, 工学研究科, 助教授 (10278393)
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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 |
¥28,500,000 (Direct Cost: ¥28,500,000)
Fiscal Year 1998: ¥14,100,000 (Direct Cost: ¥14,100,000)
Fiscal Year 1997: ¥14,400,000 (Direct Cost: ¥14,400,000)
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| Keywords | optical fiber / silica glass / glass transition / structural relaxation / ガラスファイバ |
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| Research Abstract |
Since light scattering loss in silica fiber is dominantly caused by "frozen-in" density fluctuations at the glass transition temperature, investigations of structural relaxation around the glass transition temperature are necessary for developing ultralow-loss silica glasses. In this project we tried to measure various properties of silica glasses over a wide-temperature range including the glass transition temperature, and have elucidated structural relaxation processes and their impurity effects as follows :
(1)OH or Cl enhances the alpha -relaxation governed by viscous flow, and also generates a sub-relaxational process.
(2)he sub-relaxational process is local structural change caused by impurity diffusion.
From these results, we have established controlling the structural relaxation by impurity doping, which is a basic technology to develop ultralow-loss glasses. For example, the light scattering loss was reduced by 13% by the addition of only 10 wt.ppm Na_2O to silica glass. This method is also useful for developing silica glasses with high performances such as high UV-proof and high heat-proof properties.
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