Uranium carbide

Uranium carbide
IUPAC name Uranium carbide
Identifiers
CAS number	12070-09-6 Y
Properties
Molecular formula	UC
Molar mass	250.04 g/mol
Density	13.63 g/cm3
Melting point	2350 °C [1]
Structure
Crystal structure	cubic, cF8
Space group	Fm3m, No. 225
Y carbide (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Uranium carbide, a carbide of uranium, is a hard refractory ceramic material. It comes in several stoichiometries (UC_x), such as uranium monocarbide (UC, CAS number 12070-09-6), uranium sesquicarbide (U₂C₃, CAS number 12076-62-9),^[2] and uranium dicarbide (UC₂, CAS number 12071-33-9).^[3]

Like uranium dioxide and some other uranium compounds, uranium carbide can be used as a nuclear fuel for nuclear reactors, usually in the form of pellets or tablets. Uranium carbide fuel was used in late designs of nuclear thermal rockets.

Uranium carbide pellets are used as fuel kernels for the US version of pebble bed reactors; the German version uses uranium dioxide instead.

As nuclear fuel, uranium carbide can be used either on its own, or mixed with plutonium carbide (PuC and Pu₂C₃). The mixture is also labeled as uranium-plutonium carbide (PuC U).

Uranium carbide is also a popular target material for particle accelerators.

Ammonia synthesis from nitrogen and hydrogen is sometimes accomplished in the presence of uranium carbide acting as a catalyst.^[4]

See also

• Uranium boride
• Thorium carbide

References

1. ^ Ma, Benjamin. Nuclear Reactor Materials and Applications. Van Nostrand Reinhold Co, 1983, p. 167.
2. ^ Also called diuranium tricarbide, it was reported by A.E. Austin, Acta Crystallographica, 1959, 12, 159-161.
3. ^ Uranium dicarbide was reported by A.L. Bowman, G.P. Arnold, W.G. Witteman, T.C. Wallace and N.G. Nereson, Acta Crystallographica, 1966, 21, 670-671.
4. ^ Hutchings, G. J., et al., Uranium-oxide-based catalysts for the destruction of volatile Chloro-organic compounds, Nature, 1996, 384, 341-343.