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Nonstoichiometry and Defect Mechanism in Intermetallics with L12-Structure

Published online by Cambridge University Press:  21 March 2011

Herbert Ipser ,
Olga P. Semenova ,
Regina Krachler ,
Agnes Schweitzer ,
Wenxia Yuan ,
Ming Peng  and
Zhiyu Qiao
Herbert Ipser
Affiliation:
Inst. f. Anorganische Chemie, Universität Wien, Währingerstraβe 42, A-1090 Wien, Austria
Olga P. Semenova
Affiliation:
Inst. f. Anorganische Chemie, Universität Wien, Währingerstraβe 42, A-1090 Wien, Austria
Regina Krachler
Affiliation:
Inst. f. Anorganische Chemie, Universität Wien, Währingerstraβe 42, A-1090 Wien, Austria
Agnes Schweitzer
Affiliation:
Inst. f. Anorganische Chemie, Universität Wien, Währingerstraβe 42, A-1090 Wien, Austria
Wenxia Yuan
Affiliation:
Dept. of Physical Chemistry, Univ. of Science and Technology Beijing, P.R. China 100083
Ming Peng
Affiliation:
Dept. of Physical Chemistry, Univ. of Science and Technology Beijing, P.R. China 100083
Zhiyu Qiao
Affiliation:
Dept. of Physical Chemistry, Univ. of Science and Technology Beijing, P.R. China 100083
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Abstract

A statistical-thermodynamic model was derived which allows to describe thermodynamic activities in intermetallic compounds with L12-structure as a function of composition and temperature. The energies of formation of the four types of point defects (anti-structure atoms and vacancies on both sublattices) were used as adjustable parameters. The model was applied to the three compounds Ni3Al, Ni3Ga, and Pt3Ga, and it permitted to estimate for the first time the defect formation energies for Ni3Ga and to provide initial estimates for Pt3Ga.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 646 , 2000 , N6.11.1
Copyright
Copyright © Materials Research Society 2001

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References

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