Phase relations and crystal structures in the systems (Bi,Ln)2WO(6) and (Bi,Ln)(2)MoO6 (Ln = lanthanide)

Peter S. Berdonosov, Dmitri O. Charkin, Kevin S. Knight, Karen E. Johnston, Richard J. Goff, Valeriy A. Dolgikh, Philip Lightfoot

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28 Citations (Scopus)

Abstract

Several outstanding aspects of phase behaviour in the systems (Bi,Ln)(2)WO6 and (Bi,Ln)(2)MoO6 (Ln = lanthanide) have been clarified. Detailed crystal structures, from Rietveld refinement of powder neutron diffraction data, are provided for Bi1.8La0.2WO6 (L-Bi2WO6 type) and BiLaWO6, BiNdWO6, Bi0.7Yb1.3WO6 and Bi0.7Yb1.3WO6 (all H-Bi2WO6 type). Phase evolution within the solid solution Bi2-xLaxMoO6 has been re-examined, and a crossover from gamma(H)-Bi2MoO6 type to gamma-R2MoO6 type is observed at x similar to 1.2. A preliminary X-ray Rietveld refinement of the line phase BiNdMoO6 has confirmed the alpha-R2MoO6 type structure, with a possible partial ordering of Bi/Nd over the three crystallographically distinct R sites. (c) 2006 Elsevier Inc. All rights reserved.

Original languageEnglish
Pages (from-to)3437-3444
Number of pages8
JournalJournal of Solid State Chemistry
Volume179
DOIs
Publication statusPublished - Nov 2006

Keywords

  • bismuth oxides
  • molybdates
  • tungstates
  • ferroelectric
  • neutron diffraction
  • BI2MOO6 CATALYST
  • TEMPERATURE
  • POLYMORPHS

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