Relation between thermodynamics and fluctuations due to liquid-liquid phase transition in liquid systems

2015 Fiscal Year Final Research Report

• Project/Area Number: 26610116
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Mathematical physics/Fundamental condensed matter physics
• Research Institution: Hiroshima University
• Principal Investigator: KAJIHARA Yukio 広島大学, 総合科学研究科, 助教 (20402654)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: ゆらぎ / 液体－液体相転移 / 非弾性Ｘ線散乱 / 超音波 / 水素結合系 / 高圧

Outline of Final Research Achievements

We have studied the relation between the thermodynamics and liquid-liquid phase transition in liquid systems by the sound velocity measurements with the combination of inelastic x-ray scattering and ultrasonic methods. In water-methanol mixture system, the ultrasonic sound velocity (v_US) exhibits maximum in the concentration dependence. On the other hand, IXS sound velocity (v_IXS) show simple linear variation in both concentration and temperature dependences. The "fluctuations" or relaxation intensity of the system, defined by the parameter v_IXS/v_US, becomes larger in the lower-methanol and lower-temperature region, which indicates that these fluctuations arises from the liquid-liquid phase transition of pure water located in the supercooled region.

Free Research Field

不規則系物理学