Competition between Surface Layering and Surface Phase Formation in Dilute Liquid Hg-Au Alloys

E. DiMasi; H. Tostmann; B. M. Ocko; P. S. Pershan; M. Deutsch

doi:10.1021/jp9921553

Competition between Surface Layering and Surface Phase Formation in Dilute Liquid Hg-Au Alloys

E. DiMasi, H. Tostmann, B. M. Ocko, P. S. Pershan, M. Deutsch

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

We present temperature-dependent X-ray reflectivity measurements of liquid Hg alloyed with 0.06-0.20 atom % Au. At low Au concentrations, we find temperature-dependent surface-induced layering similar to that observed in pure Hg, except that the presence of Au reduces the layering amplitude. Upon approaching the solubility limit of Au in Hg, a new surface phase forms which is 1-2 atomic diameters thick and has a density of about half that of bulk Hg. We present a surface phase diagram, summarizing the evolution of this unexpected surface structure upon varying composition and temperature. Such surface modifications may account for the variations observed in catalytic and electrochemical reactions at liquid metal surfaces upon alloying.

Original language	English
Pages (from-to)	9952-9959
Number of pages	8
Journal	Journal of Physical Chemistry B
Volume	103
Issue number	45
DOIs	https://doi.org/10.1021/jp9921553
State	Published - 11 Nov 1999
Externally published	Yes

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title = "Competition between Surface Layering and Surface Phase Formation in Dilute Liquid Hg-Au Alloys",

abstract = "We present temperature-dependent X-ray reflectivity measurements of liquid Hg alloyed with 0.06-0.20 atom % Au. At low Au concentrations, we find temperature-dependent surface-induced layering similar to that observed in pure Hg, except that the presence of Au reduces the layering amplitude. Upon approaching the solubility limit of Au in Hg, a new surface phase forms which is 1-2 atomic diameters thick and has a density of about half that of bulk Hg. We present a surface phase diagram, summarizing the evolution of this unexpected surface structure upon varying composition and temperature. Such surface modifications may account for the variations observed in catalytic and electrochemical reactions at liquid metal surfaces upon alloying.",

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AU - DiMasi, E.

AU - Tostmann, H.

AU - Ocko, B. M.

AU - Pershan, P. S.

AU - Deutsch, M.

PY - 1999/11/11

Y1 - 1999/11/11

N2 - We present temperature-dependent X-ray reflectivity measurements of liquid Hg alloyed with 0.06-0.20 atom % Au. At low Au concentrations, we find temperature-dependent surface-induced layering similar to that observed in pure Hg, except that the presence of Au reduces the layering amplitude. Upon approaching the solubility limit of Au in Hg, a new surface phase forms which is 1-2 atomic diameters thick and has a density of about half that of bulk Hg. We present a surface phase diagram, summarizing the evolution of this unexpected surface structure upon varying composition and temperature. Such surface modifications may account for the variations observed in catalytic and electrochemical reactions at liquid metal surfaces upon alloying.

AB - We present temperature-dependent X-ray reflectivity measurements of liquid Hg alloyed with 0.06-0.20 atom % Au. At low Au concentrations, we find temperature-dependent surface-induced layering similar to that observed in pure Hg, except that the presence of Au reduces the layering amplitude. Upon approaching the solubility limit of Au in Hg, a new surface phase forms which is 1-2 atomic diameters thick and has a density of about half that of bulk Hg. We present a surface phase diagram, summarizing the evolution of this unexpected surface structure upon varying composition and temperature. Such surface modifications may account for the variations observed in catalytic and electrochemical reactions at liquid metal surfaces upon alloying.

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Competition between Surface Layering and Surface Phase Formation in Dilute Liquid Hg-Au Alloys

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