The study on phase diagram of magnetic materials and alloys under high magnetic fields for development of new functional materials

强磁场下磁性材料及合金相图研究，开发新型功能材料

• 批准号: 22360285
• 负责人: KOYAMA Keiichi
• 金额: $ 11.81万
• 依托单位: Kagoshima University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22360285/
• 关键词: 強磁場; 平衡状態図; 磁場中合成; 磁場制御; 機能性材料; 磁場中材料合成; 磁性; 熱分析

Differential thermal analysis was carried out for ferromagnetic material MnBi in the temperature range 300-773K in magnetic fields up to 45 T. The decomposition temperature Tt (MnBi -> Mn1.08 Bi + liquid) increases from 632 K (at a zero field) to 714 K by applying a magnetic field of 45 T. In addition, the Bi-Mn phase diagram at 18 T was obtained, which quite different from that at a zero magnetic field. We also obtained the Fe-C steel phase diagram under high magnetic fields over 18 T. The thermodynamic calculations of the Bi-Mn binary phase diagram in high magnetic fields are carried out by the Computer Coupling of Phase Diagrams (CALPHAD) method. The calculated results show the significant change of the Bi-Mn phase diagram under magnetic fields, which were in good agreement with the experimental results of in-field thermal analysis performed by our research group.

在300- 773 K温度范围内，在高达45 T的磁场中，对铁磁材料MnBi进行了差热分析。当外加磁场为45 T时，MnBi -> Mn 1.08Bi+液相的分解温度Tt由零场时的632 K提高到714 K。此外，还得到了18 T下的Bi-Mn相图，该相图与零磁场下的相图有很大的不同。同时还得到了18 T以上强磁场下的Fe-C钢相图。用相图计算机耦合（CALPHAD）方法对强磁场下Bi-Mn二元相图进行了热力学计算。计算结果表明，磁场作用下Bi-Mn相图发生了明显的变化，这与本课题组进行的现场热分析实验结果吻合较好。

项目成果

X-Ray Powder Diffraction Studies on MnFeP0.78Ge0.22 in High Magnetic Fields

• DOI: 10.1007/s10909-012-0710-8
• 发表时间: 2013-03
• 期刊: Journal of Low Temperature Physics
• 影响因子: 2
• 作者: K. Koyama;K. Watanabe;O. Tegus;E. Brück;K. Buschow;F. D. Boer

Bi-Mn Phase Diagram in High Magnetic Field

高磁场中的 Bi-Mn 相图

• 发表时间: 2013
• 作者: Y. Mitsui;K. Koyama;K. Oikawa;K. Watanabe
• 通讯作者: K. Watanabe

圧力下におけるMn<2-x>CoxSbの磁気緩和

Mn<2-x>CoxSb在压力下的磁弛豫

• 发表时间: 2013
• 作者: 折橋広樹;松林和幸;上床美也;小山佳一
• 通讯作者: 小山佳一

Mn_<2-x>Co_xSbの圧力下磁化測定

Mn_<2-x>Co_xSb压力下磁化强度的测量

• 发表时间: 2012
• 作者: 折橋広樹、小山佳一;ら
• 通讯作者: ら

Magnetic and electrical properties of Mn_<2-x>Ni_<1+x>Sb

Mn_<2-x>Ni_<1x>Sb的磁电性能

• 发表时间: 2014
• 期刊: IEEE Trans. Magn
• 作者: Y. Yoshimine;D. Mitsunaga;H. Orihashi;D. Shimada;M. Hiroi;R. Onodera;S. Kimura;K. Takahashi and K. Koyama
• 通讯作者: K. Takahashi and K. Koyama