Author(s): A.A. Mohammed and S.A. Nour
Article publication date: 1991-08-01
Vol. 9 No. 2 (yearly), pp. 35-43.
142
Keywords
diffractometry, phase transition, X-ray
Abstract
Specimens of the system “U-Nd-O" were prepared by solid reaction containing different Nd-concentrations. The resulting compounds were phase analysed using X-ray powder diffractometry, and a single-phase region with fluorite structure was observed in the Nd2O3, molar concentration range (33% - 63%). The lattice parameter also behaved in a manner confirming a preliminary phase diagram deduced earlier O/U ratios, determined by standard polarographic techniques, exhibited an oxidation stability of the resulting fluorite structure in the concentration region up to 63 mol% Nd2O3, suggesting that the fluorite structure observed in the high Nd2O3, region is different. Room temperature magnetic susceptibilities of individual compounds exhibited clear regional distinctions which support the suggested phase diagram The observed behaviour is discussed in terms of the effect of the Nd-ion on the oxidation state of the U-ion.