Abstract
Cubic magnesium uranate, Mg y U 1− y O 2+ x , was prepared by the reaction of the mixtures of MgUO 4, MgU 3O 10 and/or UO 2 in a stream of helium. The cubic region and the values of x and y in Mg y U 1− y O 2+ x were studied under various reaction conditions. Density measurements of this compound gave a strong support to a substitutional structure. The variation of lattice constant with composition was observed to follow a linear equation, a 0 = 5·4704−0·1170x−0·5677 y. Equilibrium oxygen pressure was found to increase with magnesium concentration. The results were discussed by modifying the equation to express partial molar entropy of oxygen given by Aronson and Clayton to valence control type Mg y U 1− y O 2+ x .
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