Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7964272 | Journal of Nuclear Materials | 2016 | 7 Pages |
Abstract
Vaporisation studies over gallium rich biphasic regions (U3Ga5 + UGa2) and (UGa2 + UGa3) in the UGa system were carried out by Knusen effusion mass spectrometry in the temperature ranges of 1208-1366 K and 1133-1338 K, respectively. Ga(g) was the species observed in the mass spectra of the equilibrium vapour over both phase regions. From temperature dependence measurements, pressure-temperature relations were deduced as: log (pGa/Pa) = (â18216 ± 239)/(T/K) + (12.88 ± 0.18) over (U3Ga5 + UGa2) and log (pGa/Pa) = (â16225 ± 124)/(T/K) + (11.78 ± 0.10) over (UGa2 + UGa3). From these data, Gibbs free energy changes for the reactions 3UGa2(s) = U3Ga5(s) + Ga(g) and UGa3(s) = UGa2(s) + Ga(g) were computed and subsequently Gibbs free energies of formation of U3Ga5(s) and UGa3(s) were deduced as ÎfGTo U3Ga5(s) (±5.5) = â352.4 + 0.133 T(K) (kJ molâ1) (1208-1366 K) and ÎfGTo UGa3(s) (±3.8) = â191.9 + 0.082 T(K) (kJ molâ1) (1133-1338 K). The Gibbs free energy of formation of U3Ga5(s) is being reported for the first time.
Related Topics
Physical Sciences and Engineering
Energy
Nuclear Energy and Engineering
Authors
P. Manikandan, V.V. Trinadh, Suranjan Bera, T. S. Lakshmi Narasimhan, M. Joseph,