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Publication Citation: Crystal Structure of Ba27Fe16Ti33O117

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Author(s): T Siegrist; Terrell A. Vanderah; C Svensson; Robert S. Roth;
Title: Crystal Structure of Ba27Fe16Ti33O117
Published: July 01, 2002
Abstract: Single-crystal X-ray diffraction studies indicate that the compound Ba27Fe16Ti33O117- crystallizes in the rhombohedral space group R-3m, with a hexagonal unit cell a=5.7400(8) , c=127.11(3) ; Z=1.5. The arrangement may be described as a 54-layer (54L) close-packed structure (stacking sequence (cch)18) built from oxygen and {Ba,O} layers, with Ti4+ occupying octahedra and Fe3+ occupying both octahedral and tetrahedral interstices.The 54L structure contains hexagonal 6L BaTiO3-type (cch)2 units via a 9-fold repeat of the 6L stacking sequence, with iron preferentially occupying layers centered around z=1/6. Ba27Fe16Ti33O117 melts incongruently at 1270 C and is difficult to purify in polycrystalline form, although crystals are easily obtained from partial melts. The new compound is a member of a family of ternary Ba-Fe-Ti-O phases that may be considered as dielectric-magnetic hybrids of barium-polytitanate and barium-hexaferrite crystal chemistries.
Citation: Solid State Sciences
Volume: 4
Issue: No. 7
Keywords: Ba27Fe16TidO117,barium iron titanates,barium iron titantium oxide
Research Areas: Structures, Ceramics, Materials Science