Abstract
A series of compositions having the general formula Nd 2− y Y y Zr 2O 7 have been synthesized by heating of mixtures of oxides of the components cation and characterized by X-ray diffraction and Raman spectroscopy. Rietveld analysis on the XRD data of all the compositions has been performed which revealed a decrease in lattice parameter as a function of y in the series Nd 2− y Y y Zr 2O 7 ( y=0.0–0.8). Subsequently, a biphasic region starts which continues for y=1.2 and 1.6. The other end member, i.e. Y 2Zr 2O 7 is found to be defect fluorite. On the other hand, Nd 3+ has been used as surrogate material for Am 3+, which is a minor actinide found in spent nuclear fuel. In the pyrochlore range, the increasing trend of the x-parameter of 48 f oxygen indicates the enhancement of disorder in the system. Raman spectroscopy has been employed to validate the data obtained from XRD. The involvement of 48 f oxygen in disorder has also been verified by Raman spectroscopic investigation.
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