[19a-C301-1~7] 10.5 磁場応用

9:30 〜 9:45奨励賞エントリー英語発表

[19a-C301-3] Change of Enhancement/Suppression Effects on Solid-phase Reaction on Mn-Sb under High Magnetic Field

〇Kosuke Saito¹, Ryota Kobayashi², Yoshifuru Mitsui¹, Rie Umetsu³, Kohki Takahashi³, Keiichi Koyama¹ (1.Kagoshima Univ., 2.NIT, Kurume college, 3.IMR, Tohoku Univ.)

キーワード：

high magnetic field、reactive sintering、crystal growth

Reactions to ferromagnetic phases are promoted by magnetic fields, which are explained by the acquisition of Zeeman energy. It is important to investigate the relationship between magnetic states and kinetics of reaction in magnetic field for developing in-magnetic-field materials synthesis method. In this study, we performed reactive sintering of Mn-Sb alloys in a magnetic field to evaluate the kinetics of solid-phase reactions in which ferromagnetic materials are formed from nonmagnetic materials. At an annealing temperature of 673 K (paramagnetic Mn_1.1Sb; T_C=590 K), it is found that the reacted fraction tends to reduce with applying magnetic field at 673 K. On the other hand, at 523 K (ferromagnetic region), reaction was enhanced by applying 5 T, whereas the reaction was suppressed at 10 and 15 T. This behavior is due to competition of the parameters in rate constants. The magnetic state and magnetic field strength were found to contribute to the enhancement/suppression effect of the reaction. In the presentation, the parameters in rate constants will be shown and the relationship between magnetic field and reaction sintering progress will be discussed.