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Self-diffusion of carbon in nonstoichiometric UC

Journal Article · · J. Nucl. Sci. Technol. (Tokyo), v. 10, no. 8, pp. 493-500
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The self-diffusion of C in nonstoiehiometric UC was measured, using radioactive tracer and sectioning technique. The diffusion equations finally derived as function of temperature are: (1) For UC/sub 0.985/ D =1.7 x 10/sup -2/ expSTA--(57.4 plus or minus 1.8/RT)kcal/mol!cm/sup 2//sec over the temperature range of 1,270 deg ~ 1,600 deg C. D = 3.28 exp STA--(77.2 plus or minus nge of 1,600 deg ~ 2,000 deg C. (2) For UC/sub 1.11/ D = 9.5 x 10/sup -2/ expSTA--(54.2 plus or minus 2.6/RT)kcal mol!cm/sup 2//sec over the temperature range of 1,640 deg ~ 2,070 deg C. The activation energy for migration of C in UC is considered to be about 54 kcal/mol. From the dependence of the diffusion coefficient and the activation energy on C content in UC, it was seen that interstitial C atoms significantly influence the C diffusion in UC, and from this the C diffusion mechanism is judged to be either an interstitial or else an interstitialcy mechanism. (auth)

Research Organization:
Osaka Univ., Suita, Japan
NSA Number:
NSA-29-005410
OSTI ID:
4388670
Journal Information:
J. Nucl. Sci. Technol. (Tokyo), v. 10, no. 8, pp. 493-500, Journal Name: J. Nucl. Sci. Technol. (Tokyo), v. 10, no. 8, pp. 493-500; ISSN JNSTA
Country of Publication:
Japan
Language:
English

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Related Subjects

*CARBON-- SELF-DIFFUSION
*URANIUM CARBIDES-- SELF-DIFFUSION
ACTIVATION ENERGY
DIFFUSION
INTERSTITIALS
MIGRATION LENGTH
N50130* --Metals
Ceramics
& Other Materials--Ceramics & Cermets--Properties
Structure & Phase Studies
STOICHIOMETRY
TEMPERATURE DEPENDENCE
TRACER TECHNIQUES
VERY HIGH TEMPERATURE