Difference between revisions of "Crystalline monolayer surface of liquid Au–Cu–Si–Ag–Pd: Metallic glass former"

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==Introduction==
 
==Introduction==
  
The surface structures of liquid metals and alloys have been well characterized. While each of these systems displays surface induced atomic layering, one mystery that still remains is why certain eutectic alloys form two-dimensional surface crystals at temperatures well above the eutectic melting temperature, <math>T_{e}</math>. In the <math>Au_{82}</math><math>Si_{18}</math> eutectic and the ternary Au-Si-Ge eutectics, a low temperature (LT) 2D crystalline bilayer phase forms on melting and persists above <math>T_{e}</math>, where it eventually undergoes a first-order phase transformation to a 2D crystalline high temperature (HT) phase. As the temperature continues to increase, the HT crystal melt into a liquidlike (LL) surface that is typical of all other liquid metals.  
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The surface structures of liquid metals and alloys have been well characterized. While each of these systems displays surface induced atomic layering, one mystery that still remains is why certain eutectic alloys form two-dimensional surface crystals at temperatures well above the eutectic melting temperature, <math>T_{e}</math>. In the <math>Au_{82}</math><math>Si_{18}</math> eutectic and the ternary <math>Au-</math><math>Si-</math><math>Ge</math> eutectics, a low temperature (LT) 2D crystalline bilayer phase forms on melting and persists above <math>T_{e}</math>, where it eventually undergoes a first-order phase transformation to a 2D crystalline high temperature (HT) phase. As the temperature continues to increase, the HT crystal melt into a liquidlike (LL) surface that is typical of all other liquid metals.  
  
 
==Experimental Set-Up==
 
==Experimental Set-Up==

Revision as of 19:14, 18 September 2011

Entry by Emily Redston, AP 225, Fall 2011

Work in Progress

Reference

Crystalline monolayer surface of liquid Au–Cu–Si–Ag–Pd: Metallic glass former by S. Mechler, E. Yahel, P. S. Pershan, M. Meron, and B. Lin. Applied Physics Letters, 98, 251915 (2011)

Introduction

The surface structures of liquid metals and alloys have been well characterized. While each of these systems displays surface induced atomic layering, one mystery that still remains is why certain eutectic alloys form two-dimensional surface crystals at temperatures well above the eutectic melting temperature, <math>T_{e}</math>. In the <math>Au_{82}</math><math>Si_{18}</math> eutectic and the ternary <math>Au-</math><math>Si-</math><math>Ge</math> eutectics, a low temperature (LT) 2D crystalline bilayer phase forms on melting and persists above <math>T_{e}</math>, where it eventually undergoes a first-order phase transformation to a 2D crystalline high temperature (HT) phase. As the temperature continues to increase, the HT crystal melt into a liquidlike (LL) surface that is typical of all other liquid metals.

Experimental Set-Up

Results

Discussion