2017 Fiscal Year Final Research Report
Valence control of metal ions doped in glasses reacted with hydrogen gas
Project/Area Number |
15K06447
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
Inorganic materials/Physical properties
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Research Institution | Toyota Physical and Chemical Research Institute |
Principal Investigator |
Nogami Masayuki 公益財団法人豊田理化学研究所, フェロー事業部門, フェロー (90198573)
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Project Period (FY) |
2015-04-01 – 2018-03-31
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Keywords | ガラス / 希土類イオン / 遷移金属イオン / 価数制御 / 光特性 |
Outline of Final Research Achievements |
Controlling valence state of metal ions that are doped in glasses has been widely applied for turning optical properties. Here the reactions of hydrogen with Eu3+ and Cu2+ ions-doped Na2O-Al2O3-SiO2 glass was investigated and found that a completely different reduction was occurring than results reported so far, which was primarily determined by the Al3+/Na+ ratio in glass compositions. For the glass with Al3+/Na+ < 1, the Eu3+ ions occupied the interstitial positions in the glass structure and were not reduced even under heating in H2 gas and the Cu2+ ions were reduced via hydrogen to metallic Cu, distributing in glass body. For the glass with Al3+/Na+ > 1, on the other hand, the Eu3+ ions were reduced to the Eu2+, and the reduced Cu metal moved outwards and formed a metallic film on glass surface. In these reducing reactions of the doped-metal ions, the Al3+ ions play important role to form the OH bonds, where the doped metal ions are reduced.
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Free Research Field |
材料工学
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