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Size-dependent melting of matrix-embedded Pb-nanocrystals

Published online by Cambridge University Press:  14 March 2011

H. Ehrhardt ,
J. Weissmüller  and
G. Wilde
H. Ehrhardt
Affiliation:
Institut für Nanotechnologie, Forschungszentrum Karlsruhe, Karlsruhe, Germany
J. Weissmüller
Affiliation:
Institut für Nanotechnologie, Forschungszentrum Karlsruhe, Karlsruhe, Germany Technische Physik, Universität des Saarlandes, Saarbrücken, Germany
G. Wilde
Affiliation:
Institut für Nanotechnologie, Forschungszentrum Karlsruhe, Karlsruhe, Germany
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Abstract

We report calorimetric data for the size-dependence of the melting temperature as well as the enthalpy and entropy of melting for nanoscale Pb particles in an Al matrix, prepared by high energy ball-milling. The results are discussed with respect to various models for the melting of small confined systems. We can rule out models based on a temperature-independent Gibbs excess free energy of the particle-matrix interface, and a model based on an increased meansquare displacement of the interfacial layer. The best agreement to the data is provided by modeling the interface as an inert layer of finite thickness, which does not participate in the phase transition.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 634: Symposium B – Structure and Mechanical Properties of Nanophase Materials-Theory & Computer Simulations vs. Experiment , 2000 , B8.6.1
Copyright
Copyright © Materials Research Society 2001

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References

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