2006-11

Precise Measurement of Density of Electromagnetic Levitated Melt in Static Magnetic Fields

静磁場中における電磁浮遊高温融体の表面振動解析と密度計測の精密化

We have been newly developed the density measurement method using EML technique combined with static magnetic fields. We observed that the shape of the electromagnetically levitated droplet under a static magnetic field keep a rotational symmetry around vertical axis without the surface deformations. We can, therefore, precisely measure the density of Si melt with wide temperature range including large undercooling regions, and we confirmed that Si melt density has maximum value around 1200K.

Dep. of Phys., Gakushuin University: M. Watanabe, M. Adachi, T. Aoyagi
Fac. of System Design, Tokyo Metropolitan University: S. Ozawa, N. Takenaga, T. Hibiya
IMRAM, Tohoku University:H. Kobatake, H. Fukuyama
IMR, Tohoku University: S. Awaji

Reference: M. Watanabe, M. Adachi, K. Higuchi, H. Kobatake, H. Fukuyama, and T. Morishita,
“Does exist density maximum in supercooled liquid silicon?”　Faraday Discussions, 136 (2007) in press.

本研究では，静磁場印加電磁浮遊法によるSi融体密度の温度依存性を測定し，密度の極大の存在を示唆した．この結果は，高精度X線構造解析の結果，第一原理分子動力学シミュレーションの結果も支持する．今後測定温度範囲を広げ，密度極大の存在を明確に示していく．

学習院大学理学部：渡邉匡人，安達正芳，青柳智勇
首都大学東京システムデザイン学部：小澤俊平，尺長憲昭，日比谷孟俊
東北大多元物質科学研究所：小畠秀和，福山博之
東北大学金属材料研究所：淡路　智