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Melting vs. Solidification of a Pure Metal Analysed by DSC

Published online by Cambridge University Press:  10 February 2011

N. Clavaguera ,
M. T. Clavaguera-Mora ,
J. Fontán ,
J. L. Touron  and
C. Comas
N. Clavaguera
Affiliation:
Grup de Física de l'Estat Sòlid, Dept. E.C.M., Facultat de Física, Universitat de Barcelona, Diagonal, 647, 08028-Barcelona, Spain
M. T. Clavaguera-Mora
Affiliation:
Grup de Física de Materials I, Departament de Física, Universitat Autònoma de Barcelona, 08193-Bellaterra, Spain.
J. Fontán
Affiliation:
Grup de Física de Materials I, Departament de Física, Universitat Autònoma de Barcelona, 08193-Bellaterra, Spain.
J. L. Touron
Affiliation:
Grup de Física de Materials I, Departament de Física, Universitat Autònoma de Barcelona, 08193-Bellaterra, Spain.
C. Comas
Affiliation:
Grup de Física de Materials I, Departament de Física, Universitat Autònoma de Barcelona, 08193-Bellaterra, Spain.
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Abstract

The aim of the present paper is to analyse the melting/solidification of pure metals resulting from non-equilibrium conditions. Attention is focused on the direct measurement of the calorimetric signal obtained under isothermal hold of the sample at a temperature close to the equilibrium melting temperature Tm, which results in both melting of an overheated solid and solidification of an undercooled melt. The non-equilibrium transformations are monitored by DSC under isothermal regime, with previous continuous heating/continuous cooling of the sample. The dependence of the calorimetric signal on thermodynamic factors, ΔH and ΔG, is explored. Here ΔH and ΔG are, respectively, the melting enthalpy and Gibbs free energy difference between the crystal and the liquid. In particular, the results of the investigation performed on the melting/solidification behaviour of pure In and Pb are presented.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 481: Symposium P – Science and Technology of Semiconductor Surface Preparation , 1997 , 33
Copyright
Copyright © Materials Research Society 1998

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References

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