Thermal properties and segregation phenomena in transition metals and alloys: Modeling based on modified cohesive-energies

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Abstract

In spite of free-atom electronic-relaxation contributions to transition-metal cohesive-energies, numerous studies have misused the latter instead of using the solid-state interatomic bond-energy in modeling bulk and surface properties. This work reveals that eliminating the free-atom contributions from experimental cohesive-energies leads to highly accurate linear correlations of the resultant bond-energies with melting temperatures and enthalpies, as well as with inverse thermal-expansion coefficients, specifically for the fcc transition-metals. Likewise, predictions of surface segregation phenomena in Cu-Pd and Au-Pd alloys on the basis of the modified energetics are in much better agreement with reported low-energy ion scattering spectroscopy (LEISS) experimental results, as compared to the use of cohesive-energy values. A last demonstration of the problem and its solution involves the significant impact of the modification on segregation (separation) phase transitions in Cu-Ni model nanoparticles.

Original languageEnglish
Article number215402
JournalJournal of Physics Condensed Matter
Volume31
Issue number21
DOIs
StatePublished - 20 Mar 2019

Keywords

  • alloy segregation
  • cohesive-energy
  • interatomic bond-energy
  • thermal properties
  • transition metals

ASJC Scopus subject areas

  • Materials Science (all)
  • Condensed Matter Physics

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