Mandal, B. P. ; Garg, Nandini ; Sharma, Surinder M. ; Tyagi, A. K. (2006) Preparation, XRD and Raman spectroscopic studies on new compounds RE2Hf2O7 (RE=Dy, Ho, Er, Tm, Lu, Y): pyrochlores or defect-fluorite? Journal of Solid State Chemistry, 179 (7). pp. 1990-1994. ISSN 0022-4596
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Official URL: http://www.sciencedirect.com/science/article/pii/S...
Related URL: http://dx.doi.org/10.1016/j.jssc.2006.03.036
Abstract
A series of compositions with the general formula RE2Hf2O7 (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 RE2Hf2O7 samples only Dy2Hf2O7 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 RE2Hf2O7 samples (La, Nd, Sm) i.e., with larger RE3+ ions were also prepared and the results were compared.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | Ceramics; X-ray Diffraction (XRD); Raman Spectroscopy |
| ID Code: | 48156 |
| Deposited On: | 14 Jul 2011 08:28 |
| Last Modified: | 14 Jul 2011 11:16 |
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