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Positron Annihilation Studies of Vacancy Formation in Tungsten, Chromium, and Niobium**

Published online by Cambridge University Press:  25 February 2011

L. C. Smedskjaer ,
G. D. Loper ,
M. K. Chason  and
R. W. Siegel
L. C. Smedskjaer
Affiliation:
Materials Science and Technology Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
G. D. Loper
Affiliation:
Materials Science and Technology Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
M. K. Chason*
Affiliation:
Materials Science and Technology Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
R. W. Siegel
Affiliation:
Materials Science and Technology Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
*
‡Now at: Motorola Corporation, Schaumburg, Illinois 60196, USA
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Abstract

Vacancy formation was studied in the refractory bcc metals, tungsten, chromium, and niobium, using the positron annihilation spectroscopy Doppler broadening technique, between room temperature and the respective melting temperatures, under ultra-high vacuum conditions. Temperatures were measured by optical and infrared pyrometry, a W(Rh) thermocouple, and the power delivered to the sample, with calibrations against known melting temperatures. For W, a trapping-model analysis of the data from the temperature range 300–3633 K yielded a vacancy formation enthalpy of 3.76 ± 0.39 eV. For Cr, a similar fit to the data from 296–2049 K yielded a vacancy formation enthalpy of 2.0 ± 0.2 eV. The results are discussed in relation to previous vacancy formation and self-diffusion studies. Measurements on Nb as a function of temperature and oxygen content are also presented.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 41: Symposium K – Advanced Photon and Particle Techniques for the Characterization of Defects in Solids , 1984 , 57
Copyright
Copyright © Materials Research Society 1985

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Footnotes

†

Permanent address: Physics Department, Wichita State University, Kansas 67208, USA

**

This work was supported by the U.S. Department of Energy.

References

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