skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Preparation, XRD and Raman spectroscopic studies on new compounds RE {sub 2}Hf{sub 2}O{sub 7} (RE=Dy, Ho, Er, Tm, Lu, Y): Pyrochlores or defect-fluorite?

Abstract

A series of compositions with the general formula RE {sub 2}Hf{sub 2}O{sub 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 {sub 2}Hf{sub 2}O{sub 7} samples only Dy{sub 2}Hf{sub 2}O{sub 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 {sub 2}Hf{sub 2}O{sub 7} samples (La, Nd, Sm) i.e., with larger RE{sup 3+} ions were also prepared and the results were compared. - Graphical abstract: Display Omitted.

Authors:
 [1];  [1];  [1];  [1]
  1. Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085 (India)
Publication Date:
OSTI Identifier:
20905340
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 179; Journal Issue: 7; Other Information: DOI: 10.1016/j.jssc.2006.03.036; PII: S0022-4596(06)00184-8; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CERAMICS; FLUORITE; HAFNATES; PYROCHLORE; RAMAN SPECTROSCOPY; RARE EARTH COMPOUNDS; SIMULATION; X-RAY DIFFRACTION

Citation Formats

Mandal, B P, Garg, Nandini, Sharma, Surinder M, and Tyagi, A K. Preparation, XRD and Raman spectroscopic studies on new compounds RE {sub 2}Hf{sub 2}O{sub 7} (RE=Dy, Ho, Er, Tm, Lu, Y): Pyrochlores or defect-fluorite?. United States: N. p., 2006. Web. doi:10.1016/j.jssc.2006.03.036.
Mandal, B P, Garg, Nandini, Sharma, Surinder M, & Tyagi, A K. Preparation, XRD and Raman spectroscopic studies on new compounds RE {sub 2}Hf{sub 2}O{sub 7} (RE=Dy, Ho, Er, Tm, Lu, Y): Pyrochlores or defect-fluorite?. United States. https://doi.org/10.1016/j.jssc.2006.03.036
Mandal, B P, Garg, Nandini, Sharma, Surinder M, and Tyagi, A K. Sat . "Preparation, XRD and Raman spectroscopic studies on new compounds RE {sub 2}Hf{sub 2}O{sub 7} (RE=Dy, Ho, Er, Tm, Lu, Y): Pyrochlores or defect-fluorite?". United States. https://doi.org/10.1016/j.jssc.2006.03.036.
@article{osti_20905340,
title = {Preparation, XRD and Raman spectroscopic studies on new compounds RE {sub 2}Hf{sub 2}O{sub 7} (RE=Dy, Ho, Er, Tm, Lu, Y): Pyrochlores or defect-fluorite?},
author = {Mandal, B P and Garg, Nandini and Sharma, Surinder M and Tyagi, A K},
abstractNote = {A series of compositions with the general formula RE {sub 2}Hf{sub 2}O{sub 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 {sub 2}Hf{sub 2}O{sub 7} samples only Dy{sub 2}Hf{sub 2}O{sub 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 {sub 2}Hf{sub 2}O{sub 7} samples (La, Nd, Sm) i.e., with larger RE{sup 3+} ions were also prepared and the results were compared. - Graphical abstract: Display Omitted.},
doi = {10.1016/j.jssc.2006.03.036},
url = {https://www.osti.gov/biblio/20905340}, journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = 7,
volume = 179,
place = {United States},
year = {2006},
month = {7}
}