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Title: Local Structure of Displacively Disordered Pyrochlore Dielectrics

Abstract

Local cation environments in the pyrochlore dielectrics A{sub 2}B{sub 2}O6O' = (Bi,M){sub 2}(M,Nb){sub 2}O{sub 6}O' (M = Zn, Fe) were determined from the extended X-ray absorption fine structure. The A cations and O' ions are displaced from their ideal positions, yielding the effective (4 + 2 + 2) coordination for the A cations. The A-cation displacements are directed toward a pair of the framework O atoms; the specific displacement directions are determined by the nature of the A cations (i.e., Bi, Zn, Fe) and the local Nb/Zn (or Nb/Fe) B-site configurations. Local correlations among the atomic displacements and both [A{sub 4}O'] and [A{sub 2}B{sub 2}O] configurations provide near-ideal bond valence sums for all constituent species in these pyrochlore structures.

Authors:
; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
930311
Report Number(s):
BNL-81021-2008-JA
Journal ID: ISSN 0897-4756; CMATEX; TRN: US200822%%1463
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Chemistry of Materials; Journal Volume: 19
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION; ATOMIC DISPLACEMENTS; ATOMS; CATIONS; CORRELATIONS; DIELECTRIC MATERIALS; FINE STRUCTURE; IONS; PYROCHLORE; VALENCE; national synchrotron light source

Citation Formats

Krayzman,V., Levin, I., and Woicik, J. Local Structure of Displacively Disordered Pyrochlore Dielectrics. United States: N. p., 2007. Web. doi:10.1021/cm062429g.
Krayzman,V., Levin, I., & Woicik, J. Local Structure of Displacively Disordered Pyrochlore Dielectrics. United States. doi:10.1021/cm062429g.
Krayzman,V., Levin, I., and Woicik, J. Mon . "Local Structure of Displacively Disordered Pyrochlore Dielectrics". United States. doi:10.1021/cm062429g.
@article{osti_930311,
title = {Local Structure of Displacively Disordered Pyrochlore Dielectrics},
author = {Krayzman,V. and Levin, I. and Woicik, J.},
abstractNote = {Local cation environments in the pyrochlore dielectrics A{sub 2}B{sub 2}O6O' = (Bi,M){sub 2}(M,Nb){sub 2}O{sub 6}O' (M = Zn, Fe) were determined from the extended X-ray absorption fine structure. The A cations and O' ions are displaced from their ideal positions, yielding the effective (4 + 2 + 2) coordination for the A cations. The A-cation displacements are directed toward a pair of the framework O atoms; the specific displacement directions are determined by the nature of the A cations (i.e., Bi, Zn, Fe) and the local Nb/Zn (or Nb/Fe) B-site configurations. Local correlations among the atomic displacements and both [A{sub 4}O'] and [A{sub 2}B{sub 2}O] configurations provide near-ideal bond valence sums for all constituent species in these pyrochlore structures.},
doi = {10.1021/cm062429g},
journal = {Chemistry of Materials},
number = ,
volume = 19,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}