Observation and atomization energies of the gaseous uranium carbides, UC, UC/sub 2/, UC/sub 3/, UC/sub 4/, UC/sub 5/, and UC/sub 6/ by high temperature mass spectrometry

Journal Article · Mon Oct 01 00:00:00 EDT 1979 · J. Chem. Phys.; (United States)

OSTI ID:5974789

Gupta, S K; Gingerich, K A

Gaseous carbides of uranium, UC, UC/sub 2/, UC/sub 3/, UC/sub 4/, UC/sub 5/, and UC/sub 6/ have been observed in a mass spectrometric investigation of the Knudsen cell effusate from a thorium--uranium--rhodium--graphite system at high temperatures. Partial pressures of the carbide molecules were measured as a function of temperature in the 2300--2700/sup 0/ K range. Second and third law methods were employed to determine enthalpy changes for the reactions of the type U(g)+nC(graphite) =UC/sub n/(g), n=1 to 6, and for additional reactions with graphite involving two gaseous carbide species and various homogeneous gas phase reactions. The experimental enthalpies when combined with thermodynamic data taken from literature yielded the following atomization energies, ..delta..H/sup 0//sub at,298/, and standard heats of formation, ..delta..H/sup 0//sub f,298/:

• Research Organization: Department of Chemistry, Texas AM University, College Station, Texas 77843
• OSTI ID: 5974789
• Journal Information: J. Chem. Phys.; (United States), Vol. 71:7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
URANIUM CARBIDES
ATOMIZATION
ENTHALPY
FORMATION HEAT
MASS SPECTRA
ENERGY
GASES
VERY HIGH TEMPERATURE
ACTINIDE COMPOUNDS
CARBIDES
CARBON COMPOUNDS
FLUIDS
PHYSICAL PROPERTIES
REACTION HEAT
SPECTRA
THERMODYNAMIC PROPERTIES
URANIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties