Abstract
The vapour pressure of solid and liquid UF 4 has been measured in the temperature range 1169 to 1307 K and 1312 to 1427 K respectively, by both transpiration and evaporation-temperature methods. The vapour pressures obtained by the two methods agree well and were, therefore, combined to give the equations: log 10{p( UF 4, s)/ kPA} = (12.03±0.14)−(15994±176)( K T ) log 10{p( UF 4, l)/ kPA} = (8.99±0.24)−(12014±335)( K T ) The melting temperature, normal boiling temperature, and the standard enthalpy of fusion at the melting temperature were calculated to be 1309 K, 1720 K, and (70.3 ± 7.3) kJ mol −1 respectively. The standard enthalpy of vaporization ΔH o(vap, 298.15 K), as calculated from the vapour pressures of UF 4(s) by the second law, is (326.1±3.3) kJ mol −1 and the standard entropy of vaporization ΔS o(vap, 298.15 K) is (217.6±15.7) J K −1 mol −1. The vapour pressures and other thermodynamic quantities are compared with data from the literature.
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