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?

doi:https://doi.org/10.1016/j.jssc.2006.03.036

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?

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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:

Mandal, B P ^[1]; Garg, Nandini ^[1]; Sharma, Surinder M ^[1]; Tyagi, A K ^[1]

Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085 (India)

Publication Date:: 2006-07-15

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.

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                    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

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                    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.

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@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}

}

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