Neutron diffraction and MAS NMR of Cesium Tungstate defect pyrochlores

K R Whittle, G R Lumpkin, Sharon Elizabeth Ashbrook

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)

Abstract

Defect-pyrochlores based on the formulation CsM0 W-5(1) O-5(6) (M = Ti, Ti/Zr, Zr and Hf) have been studied using neutron diffraction and magic-angle spinning nuclear magnetic resonance (MAS NMR). The results show that structural changes are linearly linked to the change in ionic-radius for the B-site, e.g. the unit cell changes from 10.2763 angstrom for CsTi0.5W1.5O6 to 10.3820 angstrom for CsZr0 W-4(1) O-6(6). Changes in the NMR chemical shift correlate with the change in electronegativity on the B-site, and show the presence of only one Cs crystal site. (C) 2005 Elsevier Inc. All rights reserved.

Original languageEnglish
Pages (from-to)512-521
Number of pages10
JournalJournal of Solid State Chemistry
Volume179
Issue number2
DOIs
Publication statusPublished - Feb 2006

Keywords

  • defect pyrochlore
  • Cs-133 MAS NMR
  • EFFECTIVE IONIC-RADII
  • CONDUCTIVITY
  • OXIDES
  • ORDER

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