THE VAPOUR PRESSURE OF URANIUM TETRAFLUORIDE

Journal Article · Fri Jul 01 04:00:00 EDT 1960 · J. Inorg. & Nuclear Chem.

DOI:https://doi.org/10.1016/0022-1902(60)80194-7· OSTI ID:4166025

Langer, S; Blankenship, F F

The vapor pressure of liquid UF/sub 4/ was measured between 4 and 180 mm Hg (1018 to 1302 deg C) by a combination of the quasi-static method of Rodebush and Dixon and a boiling point technique. The data are consistent with the extrapolation of the effusion measurements by Ryon and Twichell on solid UF/sub 4/ The vapor pressures of the liquid car be represented by the equation: log P/sub (mm Hg)/ =-(16.840 plus or minus 44)/T -7.549 log T + 37.086 plus or minus 0.03. Extrapolation of the data to the normal boiling pcint of 1729 deg K, with the assumption of a DELTA C/sub p/ of vaporization of - 15 cal/deg mole, gives a heat of vaporization of 51.2 + 0.2 kcal/mole at the boiling point. The entropy of vaporization at the normal boiling temperature is 29.7 e.u. in reasonable agreement with those of other heavy metal tetrafluorides. The close agreement between the extrapolated effusion measurements (assuming the vapor species to be monomeric) and the measured pressures indicates the absence of associated molecules in the vapor phase. (auth)

• Research Organization: Oak Ridge National Lab., Tenn.
• NSA Number: NSA-14-021453
• OSTI ID: 4166025
• Journal Information: J. Inorg. & Nuclear Chem., Journal Name: J. Inorg. & Nuclear Chem. Vol. Vol: 14
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BOILING
CHEMISTRY
LIQUIDS
MEASURED VALUES
PRESSURE
TEMPERATURE
THERMODYNAMICS
URANIUM TETRAFLUORIDE
VAPORS