2022 Fiscal Year Final Research Report
Characteristic structural and physical properties of oxide glasses without network formation
| Project/Area Number |
20H02429
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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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| Review Section |
Basic Section 26020:Inorganic materials and properties-related
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| Research Institution | Hirosaki University |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 無容器法 / 高弾性率 / 高屈折率 / 熱伝導率 / 磁気光学効果 / 赤外透過 / ガラス構造解析 |
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| Outline of Final Research Achievements |
In this study, we have succeeded in synthesizing new glasses without network formation in various compositions with few network-forming oxides such as SiO2 and B2O3 by using a levitation technique. The structural analysis using a combination of various experimental and computational methods has confirmed that the components that form a corner-sharing network in conventional glasses are completely fragmented and isolated in these glasses. Based on the similarity to the crystal structure, we proposed that the formation of these glasses is due to a slight deviation from the densely packed atomic arrangements. We found many glasses with excellent properties (infrared transparency, high thermal conductivity, high elastic modulus, and large magneto-optical effect) that outperform conventional network glasses.
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| Free Research Field |
ガラス科学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究において多種多様なネットワーク断片化ガラスの合成に成功したことは，こうしたガラスが特殊な例外ではなく，一般的な従来型ネットワークガラスの組成を拡張した領域に存在することを示している．ネットワークが断片化されたことで，より結晶に近い原子配列をとりやすくなったが，逆にガラス形成能が上がったという結果から，結晶のような最密充填構造からのずれが，長距離秩序を失わせ，ガラス形成に至ったという新たなメカニズムを提案した．ネットワーク断片化ガラスで見られた高い弾性率，熱伝導率，赤外透過性，磁気光学効果は，従来型のガラスでは想定できないレベルであり，基礎だけでなく応用の観点からも重要な成果が得られた．
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