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Interface-Stabilized Nanoscale Quasi-Liquid Films and Interfacial Prewetting and Premelting Transitions

Published online by Cambridge University Press:  26 February 2011

Jian Luo ,
Vivek K Gupta  and
Haijun Qian
Jian Luo
Affiliation:
[email protected], Clemson University, School of Materials Science and Engineering, 201 Olin Hall, Clemson, SC, 29634, United States, 864-656-5961, 864-656-1453
Vivek K Gupta
Affiliation:
[email protected], Clemson University, School of Materials Science and Engineering, 201 Olin Hall, Clemson, SC, 29634, United States
Haijun Qian
Affiliation:
[email protected], Clemson University, School of Materials Science and Engineering, 201 Olin Hall, Clemson, SC, 29634, United States
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Abstract

Equilibrium-thickness, intergranular films (IGFs) have been observed in various ceramic materials. Recently, surficial amorphous films (SAFs) of similar character have also been found. Furthermore, a series of studies revealed the stabilization of disordered (quasi-liquid) IGFs and SAFs well below the bulk solidus or eutectic temperatures, wherein analogies to the phenomena of premelting and prewetting can be made. Accordingly, combined interfacial premelting and prewetting models have been developed using a diffuse-interface theory. This paper outlines the key results of two model experiments in support of the above theory: namely observation of quasi-liquid grain boundary films (metallic IGFs) in W-Ni and searching of a complete wetting transition for Bi2O3 on ZnO where SAFs become macroscopically thick. We propose that simple combined interfacial premelting and prewetting models apply to metallic IGFs, but only serve as a basis to understand IGFs and SAFs in ceramics where additional interactions, e.g. dispersion forces and space-charges, should be added separately and may result in more complex behaviors.

Keywords

grain boundariestransmission electron microscopy (TEM)adsorption
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 979: Symposium HH – Thermodynamics and Kinetics of Phase Transformations in Inorganic Materials , 2006 , 0979-HH04-08
Copyright
Copyright © Materials Research Society 2007

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