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Analysis of the partial molar excess entropy of dilute hydrogen in liquid metals and its change at the solid-liquid transition

Author(s)
Caldwell, Andrew Harvey; Allanore, Antoine
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Abstract
A systematic change in the partial molar enthalpy of mixing (Δh¯Hmix) and partial molar excess entropy (Δs¯Hex) for dilute hydrogen-metal systems at the solid-liquid transition is reported. Expressions for Δh¯Hmix and Δs¯Hex are derived from the Fowler model of hydrogen solubility, and the change in Δs¯Hex at melting is bounded. The theoretical bound is in agreement with measured data. A connection is made between the change in Δs¯Hex and short range order in the metal-hydrogen system.
Date issued
2019-07
URI
https://hdl.handle.net/1721.1/131149
Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering; MIT Materials Research Laboratory
Journal
Acta Materialia
Publisher
Elsevier BV
Citation
Caldwell, Andrew H. and Antoine Allanore. "Analysis of the partial molar excess entropy of dilute hydrogen in liquid metals and its change at the solid-liquid transition." Acta Materialia 173 (July 2019): 1-8.
Version: Original manuscript
ISSN
1359-6454

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