THE URANIUM-NITROGEN-CARBON SYSTEM
Open Access
- 23 June 1958
- report
- Published by Office of Scientific and Technical Information (OSTI)
Abstract
The ternary system uranium- nitrogen- carbon has been studied at 1800 deg C under vacuum and under a 1atm. nitrogen pressure. There is complete solid solubility between UN and UC, and essentially no solid solubility of nitrogen in UC/sub 2/ or U/sub 2/C/sub 3/ or of carbon in U/sub 2/N/su b 3/. At 1800 deg C the two-phase field, U(C,N) and UC/sub 2/, and the three-phase field, U(C,N), UC/ sub 2/, and C, exist in vacuum or argon. At 1 atm. of nitrogen, the uranium nitrides are more stable than the uranium carbides up to 1800 deg C, but at 2000 deg C, the uranium carbides UC/sub 2/ + U(C,N) become more stable. At 1 atm. of nitrogen, U/sub 2/N/sub 3/ is the stable phase up to 1550 deg C, and U(N,C) solid solution is stable at 1800 deg C. (auth)Keywords
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