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Two-Dimensional Freezing in the Liquid-Vapor Interface of a Dilute Pb:Ga Alloy

Bin Yang, David Gidalevitz, Dongxu Li, Zhengqing Huang and Stuart A. Rice
Proceedings of the National Academy of Sciences of the United States of America
Vol. 96, No. 23 (Nov. 9, 1999), pp. 13009-13011
Stable URL: http://www.jstor.org/stable/49108
Page Count: 3
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Two-Dimensional Freezing in the Liquid-Vapor Interface of a Dilute Pb:Ga Alloy
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Abstract

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.

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