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Selected Works of Lan Li
Article
Crystallographic Studies of Ba12Nb8-xTaxCo4O36 (x=1,3,4,5,7)
Solid State Sciences
  • W. Wong-Ng, National Institute of Standards and Technology
  • G. Liu, China University of Geosciences
  • I. Levin, National Institute of Standards and Technology
  • I. Williamson, Boise State University
  • A. Correa Hernandez, Boise State University
  • J. A. Kaduk, Illinois Institute of Technology
  • L. Li, Boise State University
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Document Type
Article
Publication Date
9-1-2017
Disciplines
Abstract

Crystal structures and X-ray reference powder diffraction patterns have been determined for the Ba12Nb8-xTaxCo4O36 (x = 1, 3, 4, 5, 7) series. Ba12Nb8-xTaxCo4O36 crystallize in the cubic perovskite structure with a space group Pm3m (No. 221) and the lattice parameter increasing from a = 4.08732(3) Å to a = 4.08894 (2) Å as x varies from 1 to 7. The Goldschmidt distortion parameter for the entire series is about 1.05 (1.0488–1.0506), being similar to that of the cubic end member Ba3Nb2CoO9. Transmission electron microscopy of the composition Ba12Nb4Ta4Co4O36 (or Ba3(NbTaCo)O9) revealed nanoscale 1:2 ordering of Nb/Ta and Co, manifested in the presence of the diffuse superlattice reflections. As this ordering is limited to short range, the average structures were still refined assuming the ideal-perovskite cubic symmetry. X-ray powder diffraction patterns of the studied compounds have been submitted to the Powder Diffraction File (PDF).

Citation Information
Wong-Ng, W.; Liu, G.; Levin, I.; Williamson, I.; Correa Hernandez, A.; Kaduk, J. A.; and Li, Lan. (2017). "Crystallographic Studies of Ba12Nb8-xTaxCo4O36 (x=1,3,4,5,7)". Solid State Sciences, 71, 3-7.