Pressure-driven liquid-liquid transformations and corresponding bizarre viscosity behavior

圧力誘起液体-液体転移とそれに対応する奇妙な粘性のふるまい

Brazhkin, V. V.*; 片山 芳則; 神崎 正美*; Lyapin, A. G.*

Brazhkin, V. V.*; Katayama, Yoshinori; Kanzaki, Masami*; Lyapin, A. G.*

圧力による液体-液体転移の近年、元素や酸化物などの液体において、構造や性質の変化を伴う転移が高圧下で見出されている。本研究では、結晶固体でも圧力によって結合状態が変化するSeやAsS, AsS, BOについて、構造および粘性を調べた。構造はX線回折、粘性はラジオグラフィーによる落下球法によって測定した。それぞれの物質に対し、構造変化に伴う大きな粘性の変化が観測された。

In recent years, transformations in the melts of elementary substances and oxides have been found under high pressure. These transformations are accompanied by structural changes and variations in physical properties. In this work, structure and viscosity of Se, AsS, AsS, AsS and BO were studied using synchrotron radiation. These substances exhibit changes in bonding in the crystalline state under high pressure. An X-ray diffraction measurements and falling sphere viscosity measurements using an X-ray radiography technique were carried out. Huge change in viscosity which accompanies structural change under compression was observed in each substance.