The formation of solid solutions of (U1-yGdy)C-2 (where 0.2 less than or equal to y less than or equal to 0.8) in the high carbon region, has been studied in the temperature range 1063-1673 K. The solid solutions were prepared by blending the stoichiometric amounts of oxides with graphite and heating the mixture in the form of a pellet to the reaction temperature in a high vacuum chamber. The effusion of CO from the pellet was monitored by means of a quadrupole mass spectrometer. The effusion pressures of CO in the vacuum chamber were correlated to the equilibrium pressure of the system. according to a new method developed in our laboratory [R. Vidhya, M.P. Antony, C.K. Mathews, J. Phys. Chem. 99 (1995) 16468]. The reported solubility [T.C. Wallace, N.H. Krikorian, P.L. Stone, J. Electrochem. Soc. 111(12) (1964) 1404] of 'GdC2' in 'UC2' was verified by XRD. The Gibbs energies of formation of the different solid solutions have been calculated. (C) 1997 Elsevier Science B.V. [References: 9]
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