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A New Approach to Study Vacancy Defects in High-Temperature Intermetallic Compounds

Published online by Cambridge University Press:  22 February 2011

Gary S. Collins  and
Praveen Sinha
Gary S. Collins
Affiliation:
Washington State University, Department of Physics, Pullman, WA 99164
Praveen Sinha
Affiliation:
Washington State University, Department of Physics, Pullman, WA 99164
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Abstract

Perturbed angular correlations of gamma rays (PAC) is being applied to study defects in ordered intermetallic alloys. Vacancies on both Pd and In sublattices in the B2 system Pdln were detected after quenching through quadrupole interactions induced at nearby 111In probe atoms. Fractions of probe atoms having each type of neighboring defect were observed to increase monotonically with quenching temperature over the range 8251500 K. For compositions close to 50.15 at.% Pd, nearly equal site fractions were observed for Pd and In vacancies, indicating that the Schottky vacancy-pair defect is the thermal defect at high temperature. The formation enthalpy of the Schottky defect was determined to be 1.3(2) eV through analysis of quenching data from in the range 825–1200 K. Above 1200 K, however, the vacancy concentration was observed to saturate at a value of 1.4(2) atomic percent, perhaps due to breakdown of the law of mass action for high defect concentrations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 59
Copyright
Copyright © Materials Research Society 1995

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References

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