Yang B, Gidalevitz D, Li D, Huang Z, Rice S A
Department of Chemistry and The James Franck Institute, University of Chicago, Chicago, IL 60637, USA.
Proc Natl Acad Sci U S A. 1999 Nov 9;96(23):13009-11. doi: 10.1073/pnas.96.23.13009.
We report the results of x-ray reflectivity and grazing incidence x-ray diffraction studies of the liquid-vapor interface of a dilute alloy of Pb in Ga over the temperature range of 23-76 degrees C. Our data show that the liquid-vapor interface of this alloy is stratified for several atomic diameters into the bulk liquid and that a monolayer of Pb forms the outermost stratum of the interface. Over the temperature range of 23-56 degrees C, the monolayer of Pb is in an ordered hexagonal phase. At about 58 degrees C, this monolayer undergoes a first-order transition to a hexatic phase, which remains stable to 76 degrees C. An analogy between the observed transition and the first-order melting transition in a one-component classical plasma is suggested.
我们报告了在23至76摄氏度温度范围内，对Ga中Pb稀合金的液 - 气界面进行X射线反射率和掠入射X射线衍射研究的结果。我们的数据表明，该合金的液 - 气界面在几个原子直径的范围内分层进入本体液体，并且单层Pb形成了界面的最外层。在23至56摄氏度的温度范围内，单层Pb处于有序六方相。在约58摄氏度时，该单层经历一级转变为六次近晶相，该相在76摄氏度时保持稳定。有人提出了观察到的转变与单组分经典等离子体中的一级熔化转变之间的类比。
