Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 179, Issue 11, Pages 3437-3444Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2006.07.008
Keywords
bismuth oxides; molybdates; tungstates; ferroelectric; neutron diffraction
Funding
- Engineering and Physical Sciences Research Council [EP/C008448/1] Funding Source: researchfish
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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.
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