MASS SPECTROMETRIC STUDIES OF PLUTONIUM COMPOUNDS AT HIGH TEMPERATURES .2. ENTHALPY OF SUBLIMATION OF PLUTONIUM (3) FLUORIDE AND DISSOCIATION ENERGY OF PLUTONIUM (I) FLUORIDE

A mass spectrometric investigation of the sublimation of PuF3 in the temperature range 1243-1475°K has established the principal vapor species to be PuF3(g). The vapor pressure is given by the equation log P (atm) = [(- 20,734 ± 118)/T°K] +(9.288 ± 0.087). The enthalpy and entropy of sublimation at 298 °K are calculated to be 101 ± 3 kcal mole-1 and 51.6 ± 2.5 eu, respectively. Studies of the equilibria among gaseous species over the mixture Pu + PuF3 yielded the atomization energies of PuF3(g) and PuF2(g) and the dissociation energy of PuF(g). © 1968, American Chemical Society. All rights reserved.