ON THE ANOMALOUS SELF DIFFUSION IN BODY-CENTERED CUBIC ZIRCONIUM

Journal Article · Tue Oct 01 04:00:00 EDT 1963 · Canadian Journal of Physics (Canada)

DOI:https://doi.org/10.1139/p63-159· OSTI ID:4690736

Kidson, G V

Results of recent diffusion studies in the BCC phase of Zr give unusually low values of the parameters Q and D/sub o/ in the expression for the diffusion coefficient D = D/sub o/ exp (--Q/RT). Measurements in the high- temperature range show a marked departure from linearity in a plot of log D vs. 1/T. A simple model is proposed to account for these results based on the assumption that excess vacancies introduced by impurities (probably oxygen) predominate in the low-temperature region. It is found that for zirconium the measured diffusion coefficient can be represented over the whole temperature range by D = 1.34 exp (--65,200/RT) + 8.5 x 10/sup -5/ exp (--27,000/RT) cm/sup 2/ /sec. The calculated concentration of excess vacancies is 0.038 atomic per cent. (auth)

• Research Organization: Atomic Energy of Canada Ltd., Chalk River, Ont.
• NSA Number: NSA-17-041447
• OSTI ID: 4690736
• Report Number(s): AECL-1817; 0008-4204
• Journal Information: Canadian Journal of Physics (Canada), Journal Name: Canadian Journal of Physics (Canada) Vol. Vol: 41; ISSN CJPHA
• Country of Publication: Canada
• Language: English

Related Subjects

ALLOTROPY
DEFECTS
DIFFUSION
HIGH TEMPERATURE
IMPURITIES
LATTICES
MEASURED VALUES
METALS, CERAMICS, AND OTHER MATERIALS
VACANCIES
ZIRCONIUM