期刊
SCIENCE
卷 322, 期 5901, 页码 566-570出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1160766
关键词
-
资金
- Higher Education Funding Council in Wales
- Centre for Advanced Functional Materials and Devices
- Engineering and Physical Sciences Research Council [EP/E026818/1] Funding Source: researchfish
- EPSRC [EP/E026818/1] Funding Source: UKRI
We combine small-angle x-ray scattering (SAXS) and wide-angle x-ray scattering (WAXS) with aerodynamic levitation techniques to study in situ phase transitions in the liquid state under contactless conditions. At very high temperatures, yttria-alumina melts show a first-order transition, previously inferred from phase separation in quenched glasses. We show how the transition coincides with a narrow and reversible maximum in SAXS indicative of liquid unmixing on the nanoscale, combined with an abrupt realignment in WAXS features related to reversible shifts in polyhedral packing on the atomic scale. We also observed a rotary action in the suspended supercooled drop driven by repetitive transitions (a polyamorphic rotor) from which the reversible changes in molar volume (1.2 +/- 0.2 cubic centimeters) and entropy (19 +/- 4 joules mole(-1) kelvin(-1)) can be estimated.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据