2019 Fiscal Year Final Research Report
Fast water insertion mechanism in rare-earth sulfates
| Project/Area Number |
17K17821
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Inorganic materials/Physical properties
Structural/Functional materials
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Keywords | 化学蓄熱 / 硫酸塩 / 脱挿入 / 拡散 / 脱水 / 水和 |
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| Outline of Final Research Achievements |
The insertion of water into beta lanthanum sulfate was confirmed to be due to the one-dimensional diffusion between stable positions arranged in a one-dimensional manner in the crystal while maintaining the host crystal structure. Beta lanthanum sulfate powder produced by dehydration of lanthanum sulfate nonahydrate was found to have a microstructure which looks like "platy joints" composed of stacked several hundred nanometer-thick plate-like crystals. The grain boundary diffusion was found to be the origin of the fast insertion/extraction of water.
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| Free Research Field |
化学熱力学
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| Academic Significance and Societal Importance of the Research Achievements |
化学蓄熱は産業排熱の有効利用のために期待される技術のひとつである。硫酸ランタンは、200℃以下の比較的低温であっても可逆的に水蒸気と反応し、吸熱・発熱を伴って水が脱挿入されるため、この温度域における化学蓄熱技術の開発に向けて興味深い物質である。本研究の意義は、本物質への高速な水の脱挿入メカニズムを解明し、材料組織、結晶構造に立脚した化学蓄熱材の開発指針を提案したことである。
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