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X-ray powder reference patterns for magnetoplumbite-like compounds, (Bax Sr1−x )Ti6Co6O19 (x = 0.2, 0.4, 0.6, 0.8)

Published online by Cambridge University Press:  10 September 2015

W. Wong-Ng ,
G. Liu  and
J. A. Kaduk
W. Wong-Ng*
Affiliation:
Materials Measurement Science Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
G. Liu
Affiliation:
Science Research Institute, China University of Geosciences, Bejing 100083, China
J. A. Kaduk
Affiliation:
BCPS, Illinois Institute of Technology, Chicago, Illinois 60616
*
a) Author to whom correspondence should be addressed. Electronic mail: winnie.wong-ng@nist.gov
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Abstract

X-ray reference powder patterns and crystal structures have been determined for a series of titanium- and cobalt-containing layered alkaline-earth compounds with nominal formula (Bax Sr1−x )Ti6Co6O19 (x = 0.2, 0.4, 0.6, 0.8). Structural isomorphism of the title compounds with the hexagonal ferrite BaFe12O19 and magnetoplumbite (PbFe12O19), was confirmed. The (Bax Sr1−x )Ti6Co6O19 series crystallize in the space group of P63 /mmc (No. 194) and Z = 2. The lattice parameters range from a = 5.90729(6) Å, c = 23.2378(3) Å, and V = 702.27(2) Å3 for x = 0.2 to a = 5.914 93(9), c = 23.3391(5) Å, and V = 707.15(2) Å3 with x = 0.8. The structure consists of alternating spinel S-block and R-blocks. The tetrahedral sites within the spinel S-blocks are occupied with only Co2+, while Ti4+ is mainly located in the octahedral sites of the spinel S-blocks and in the face-sharing octahedral site of the R-blocks. A bipyramidal mixed Co/Ti site was confirmed in the R-block of the structure. Powder X-ray diffraction patterns of this series of compounds have been submitted to be included in the Powder Diffraction File.

Keywords

(Bax Sr1−x )Ti6Co6O19layered magnetoplumbite-like structurepowder X-ray diffraction patterns
Type
Technical Articles
Information
Powder Diffraction , Volume 30 , Issue 3 , September 2015 , pp. 256 - 262
Copyright
Copyright © International Centre for Diffraction Data 2015 

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