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Title: Atomic disorder in Gd{sub 2}Zr{sub 2}O{sub 7} pyrochlore

Gd{sub 2}Zr{sub 2}O{sub 7} pyrochlore with different degrees of cation disorder were synthesized by isothermal annealing at various temperatures (1100–1550 °C), and the related changes in the structure were investigated by ambient and high pressure x-ray diffraction (XRD) measurements. Unit cell parameters increase almost linearly with increasing treatment temperature. The degree of cation order in pyrochlore also increases with the increase of temperature, but saturates at ∼60%. The compressibility of the pyrochlore structures decreases when the degree of cation order increases. High pressure XRD measurements also indicate that the phase stability of Gd{sub 2}Zr{sub 2}O{sub 7} is not very sensitive to the degree of atomic disorder in the pyrochlore structure.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, Hebei 066004 (China)
  2. (United States)
  3. Department of Nuclear Engineering, University of Tennessee, Knoxville, Tennessee 37996 (United States)
  4. Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305 (United States)
Publication Date:
OSTI Identifier:
22399037
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 19; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANNEALING; CATIONS; COMPRESSIBILITY; CUBIC LATTICES; GADOLINIUM COMPOUNDS; PHASE STABILITY; PYROCHLORE; TEMPERATURE DEPENDENCE; ZIRCONATES