Abstract
A series of compositions with the general formula RE 2Hf 2O 7 ( RE=Dy, Ho, Er, Tm, Y and Lu) was prepared by a standard solid-state route and characterized by powder X-ray diffraction (XRD) and Raman spectroscopy. As per theoretical modeling reported in literature, some of these materials were predicted to exist in pyrochlore lattice. However, a careful X-ray diffraction, Raman spectroscopic and synchrotron radiation-XRD study revealed that under the experimental conditions used in the present investigation, out of all the RE 2Hf 2O 7 samples only Dy 2Hf 2O 7 has got a tendency to form a pyrochlore structure. All the other (Ho, Er, Tm, Lu, Y) hafnates crystallize in a defect-fluorite structure. In order to further ascertain these inferences, a few more RE 2Hf 2O 7 samples (La, Nd, Sm) i.e., with larger RE 3+ ions were also prepared and the results were compared.
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