Methods for determining vacancy formation thermodynamic

Research output: Chapters, Conference Papers, Creative and Literary Works (RGC: 12, 32, 41, 45)32_Refereed conference paper (with ISBN/ISSN)peer-review

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Author(s)

Detail(s)

Original languageEnglish
Title of host publicationSymposium O – Materials Theory and Modeling
PublisherCambridge University Press
Pages455-460
Volume291
ISBN (Print)1558991867
Publication statusPublished - Nov 1992
Externally publishedYes

Publication series

NameMaterials Research Society Symposium Proceedings
Volume291
ISSN (Electronic)0272-9172

Conference

Title1992 MRS Fall Meeting
PlaceUnited States
CityBoston, Massachusetts
Period30 November - 4 December 1992

Abstract

The vacancy formation thermodynamics in six fcc metals Ag, Au, Cu, Ni, Pd and Pt are determined from atomistic simulations as a function of temperature. This investigation is performed using the Embedded Atom Method interatomic potentials and the finite temperature properties are determined within the local harmonic and the quasiharmonic frameworks. We find that the temperature dependence of the vacancy formation energy can make a significant contribution to the vacancy concentration at high temperatures. An additional goal of the present study is to evaluate the accuracy of the local harmonic method under circumstances in which the excess entropy associated with the formation of a defect is very small. Our data demonstrate that while the errors associated with determining the vacancy formation entropy in the local harmonic model are large, a simple extension to the local harmonic method yields thermodynamic properties comparable to that obtained in the quasiharmonic model, but with much higher computational efficiency.

Citation Format(s)

Methods for determining vacancy formation thermodynamic. / Zhao, L.; Najafabadi, R.; Srolovitz, D. J.

Symposium O – Materials Theory and Modeling. Vol. 291 Cambridge University Press, 1992. p. 455-460 (Materials Research Society Symposium Proceedings; Vol. 291).

Research output: Chapters, Conference Papers, Creative and Literary Works (RGC: 12, 32, 41, 45)32_Refereed conference paper (with ISBN/ISSN)peer-review