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Title: Structural transition in rare earth doped zirconium oxide: A positron annihilation study

Abstract

Graphical abstract: New microstructural analysis and phase transition of rare earth doped mixed oxide compounds such as: Sm{sub 2−x}Dy{sub x}Zr{sub 2}O{sub 7} (where x = 0.0 ≤ x ≥ 2.0) that are potentially useful as solid oxide fuels, ionic conductors, optoelectronic materials and most importantly as radiation resistant host for high level rad-waste disposal, structural transition in the system is reported through positron annihilation spectroscopy as there is an indication in the X-ray diffraction analysis. Highlights: ► Zirconium oxide material doped with rare earth ions. ► The method of positron annihilation spectroscopy suggests a phase transition in the system. ► The crystal structure transformation from pure pyrochlore to defect fluorite type of structure is shown by X-ray diffraction results. -- Abstract: A series of compounds with the general composition Sm{sub 2−x}Dy{sub x}Zr{sub 2}O{sub 7} (where 0 ≤ x ≥ 2.0) were synthesized by chemical route and characterized by powder X-ray diffraction (XRD) analysis. The rare earth ion namely Sm{sup +3} in the compound was gradually replaced with another smaller and heavier ion, Dy{sup +3} of the 4f series, there by resulting in order–disorder structural transition, which has been studied by positron annihilation lifetime and Doppler broadening spectroscopy. This study revealsmore » the subtle electronic micro environmental changes in the pyrochlore lattice (prevalent due to the oxygen vacancy in anti-site defect structure of the compound) toward its transformation to defect fluorite structure as found in Dy{sub 2}Zr{sub 2}O{sub 7}. A comparison of the changes perceived with PAS as compared to XRD analysis is critically assayed.« less

Authors:
 [1];  [2];  [2]; ; ;  [1]
  1. Applied Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085 (India)
  2. Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064 (India)
Publication Date:
OSTI Identifier:
22215606
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 47; Journal Issue: 11; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANNIHILATION; DOPED MATERIALS; DOPPLER BROADENING; FLUORITE; HEAVY IONS; MICROSTRUCTURE; PHASE TRANSFORMATIONS; POSITRONS; PYROCHLORE; RARE EARTHS; SPECTROSCOPY; WASTE DISPOSAL; X-RAY DIFFRACTION; ZIRCONIUM OXIDES

Citation Formats

Chakraborty, Keka, Bisoi, Abhijit, Ganguly, Bichitra Nandi, E-mail: bichitra.ganguly@saha.ac.in, Grover, Vinita, Sayed, Farheen Nasir, and Tyagi, A.K. Structural transition in rare earth doped zirconium oxide: A positron annihilation study. United States: N. p., 2012. Web. doi:10.1016/J.MATERRESBULL.2012.06.044.
Chakraborty, Keka, Bisoi, Abhijit, Ganguly, Bichitra Nandi, E-mail: bichitra.ganguly@saha.ac.in, Grover, Vinita, Sayed, Farheen Nasir, & Tyagi, A.K. Structural transition in rare earth doped zirconium oxide: A positron annihilation study. United States. doi:10.1016/J.MATERRESBULL.2012.06.044.
Chakraborty, Keka, Bisoi, Abhijit, Ganguly, Bichitra Nandi, E-mail: bichitra.ganguly@saha.ac.in, Grover, Vinita, Sayed, Farheen Nasir, and Tyagi, A.K. Thu . "Structural transition in rare earth doped zirconium oxide: A positron annihilation study". United States. doi:10.1016/J.MATERRESBULL.2012.06.044.
@article{osti_22215606,
title = {Structural transition in rare earth doped zirconium oxide: A positron annihilation study},
author = {Chakraborty, Keka and Bisoi, Abhijit and Ganguly, Bichitra Nandi, E-mail: bichitra.ganguly@saha.ac.in and Grover, Vinita and Sayed, Farheen Nasir and Tyagi, A.K.},
abstractNote = {Graphical abstract: New microstructural analysis and phase transition of rare earth doped mixed oxide compounds such as: Sm{sub 2−x}Dy{sub x}Zr{sub 2}O{sub 7} (where x = 0.0 ≤ x ≥ 2.0) that are potentially useful as solid oxide fuels, ionic conductors, optoelectronic materials and most importantly as radiation resistant host for high level rad-waste disposal, structural transition in the system is reported through positron annihilation spectroscopy as there is an indication in the X-ray diffraction analysis. Highlights: ► Zirconium oxide material doped with rare earth ions. ► The method of positron annihilation spectroscopy suggests a phase transition in the system. ► The crystal structure transformation from pure pyrochlore to defect fluorite type of structure is shown by X-ray diffraction results. -- Abstract: A series of compounds with the general composition Sm{sub 2−x}Dy{sub x}Zr{sub 2}O{sub 7} (where 0 ≤ x ≥ 2.0) were synthesized by chemical route and characterized by powder X-ray diffraction (XRD) analysis. The rare earth ion namely Sm{sup +3} in the compound was gradually replaced with another smaller and heavier ion, Dy{sup +3} of the 4f series, there by resulting in order–disorder structural transition, which has been studied by positron annihilation lifetime and Doppler broadening spectroscopy. This study reveals the subtle electronic micro environmental changes in the pyrochlore lattice (prevalent due to the oxygen vacancy in anti-site defect structure of the compound) toward its transformation to defect fluorite structure as found in Dy{sub 2}Zr{sub 2}O{sub 7}. A comparison of the changes perceived with PAS as compared to XRD analysis is critically assayed.},
doi = {10.1016/J.MATERRESBULL.2012.06.044},
journal = {Materials Research Bulletin},
issn = {0025-5408},
number = 11,
volume = 47,
place = {United States},
year = {2012},
month = {11}
}