Mixed crystal formation and structural studies in the mullite-type system Bi 2Fe 4O 9Bi 2Mn 4O 10
Document Type
Article
Publication Date
1-1-2012
Abstract
The limits of metal cation substitution and distribution in the sequence Bi 2Fe 4O 9Bi 2Mn 4O 10 have been investigated by solid state synthesis, X-ray powder diffraction, and Mössbauer spectroscopy. Rietveld refinements conducted for the entire range along the join indicate the structures are orthorhombic with space group Pbam, with partial transition-metal site disorder confirmed and detailed by Mössbauer spectroscopy. Single-phase regions are found near each end-member and a two-phase region is observed at intermediate compositions, extending from about x=1 to 3, according to the general formula of the mixed crystals Bi 2Fe 4-xMn xO 10-δ. An incorporation of Mn at octahedral sites replacing Fe is taken into account for the Bi 2Fe 4O 9-related side of the system. Charge compensation is believed to be effected by addition of O, which gives rise to the formation of FeO 5 pyramids. At the Bi 2Mn 4O 10-related side of the system, substitution of pyramidal Mn 3 by Fe 3 is envisaged. © 2011 Elsevier Inc. All rights reserved.
Publication Title
Journal of Solid State Chemistry
Volume
185
First Page
62
Last Page
71
Digital Object Identifier (DOI)
10.1016/j.jssc.2011.10.046
ISSN
00224596
E-ISSN
1095726X
Citation Information
Kann, Auletta, J. T., Hearn, E. W., Weber, S.-U., Becker, K. D., Schneider, H., & Lufaso, M. W. (2012). Mixed crystal formation and structural studies in the mullite-type system Bi2Fe4O9–Bi2Mn4O10. Journal of Solid State Chemistry, 185, 62–71. https://doi.org/10.1016/j.jssc.2011.10.046