2021 Fiscal Year Final Research Report
Control a first-order magnetic transition temperature of an iron-based alloy by adding an interstitial element.
| Project/Area Number |
19K15276
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 26010:Metallic material properties-related
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| Research Institution | Ehime University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 磁性 / 磁気熱量効果 |
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| Outline of Final Research Achievements |
Magnetocaloric materials with magnetic order near room temperature are required for magnetic refrigeration near room temperature. In this work, I aimed to increase magnetic transition temperature to room temperature by adding an interstitial element to an iron-based alloy with exhibits a first-order magnetic transition at low temperatures. A second-order magnetic phase transition was observed at around room temperature by increasing B content. This may be due to the stabilization of ferromagnetism by the increase in the density of states.
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| Free Research Field |
磁性
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| Academic Significance and Societal Importance of the Research Achievements |
鉄系合金へ侵入型元素を導入することで，体積膨張させて転移温度を上昇させることを目指した．添加元素と母相の元素とで第2相を形成したことで体積は収縮したが，転移温度は上昇した．これは，母相合金の元素量が減少したことで母相合金よりもd電子数が減少し，フェルミ面上での状態密度が上昇した可能性が考えられる．添加元素と母相元素との間で金属間化合物を形成させることで，磁気相転移温度を制御できることが可能になると考えられる．
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