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Point Defect Characterization in CoAl Using Positron Annihilation

Published online by Cambridge University Press:  10 February 2011

Werner Puff,
Bernd Logar and
Adam G. Balogh
Werner Puff
Affiliation:
Institut für Technische Physik, Technische Universitdt Graz, Petersgasse 16, A-8010 Graz, Austria, wp@ifk.tu-graz.ac.at
Bernd Logar
Affiliation:
Institut für Technische Physik, Technische Universitdt Graz, Petersgasse 16, A-8010 Graz, Austria, wp@ifk.tu-graz.ac.at
Adam G. Balogh
Affiliation:
FB Materialwissenschaft, FG Dünne Schichten, Technische Hochschule Darmstadt, Petersenstraße 23, 64287 Darmstadt, Germany
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Abstract

Vacancy-like defects in CoAl in the composition range 48.5 at.-% <Cco, < 53 at.-% are investigated by means of positron lifetime spectroscopy and Doppler-broadening measurements. The observed lifetimes in the annealed samples confirm that defects are quenched-in during the production of the samples. The values of the positron lifetime and the S-parameter decrease with increasing Co concentration. After quenching from 1400°C or 1600°C an increase in the positron parameters isobserved. Long-time annealing of the Co-rich sample shows a dramatic decrease of the positron lifetime to the expected bulk lifetime.

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