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          Institute: MPI für Festkörperforschung     Collection: FKF Publikationen 2006     Display Documents

ID: 306051.0, MPI für Festkörperforschung / FKF Publikationen 2006
Crystal structure and magnetic properties of FeTe2O5X (X = Cl, Br): A frustrated spin cluster compound with a new Te(IV) coordination polyhedron
Authors:Becker, R.; Johnsson, M.; Kremer, R. K.; Klauss, H. H.; Lemmens, P.
Date of Publication (YYYY-MM-DD):2006
Title of Journal:Journal of the American Chemical Society
Issue / Number:48
Start Page:15469
End Page:15475
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:A new layered transition metal oxohalide, FeTe2O5ClxBr1-x, has been
identified. It crystallizes in the monoclinic space group P2(1)/c. The
unit cell for FeTe2O5Br is a = 13.3964(8), b = 6.5966(4), c =
14.2897(6) angstrom beta = 108.118(6)degrees, and Z = 8. The layers are
built of edge sharing [FeO6] octahedra forming [Fe4O16](20-) units that
are linked by [Te4O10X2](6-) groups. The layers have no net charge and
are only weakly connected via van der Waals forces to adjacent layers.
There are four crystallographically different Te atoms, and one of them
displays a unique [TeO2X] coordination polyhedron (X = Cl, Br).
Magnetic susceptibility measurements show a broad maximum typical for
4-spin clusters of coupled Fe(III) ions in the high-spin state.
Evidence for magnetic instabilities exists at low temperatures, which
have been confirmed with specific heat experiments. A theoretical
modeling of the susceptibility concludes a frustration of the
intra-tetramer anti-ferromagnetic exchange interaction.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Festkörperforschung
External Affiliations:Stockholm Univ, Dept Inorgan Chem, S-10691 Stockholm, Sweden.
; Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany.
; Tech Univ Carolo Wilhelmina Braunschweig, Inst Phys & Condensed Matter, D-38106 Braunschweig, Germany.
Identifiers:ISI:000242367000031 [ID No:1]
ISSN:0002-7863 [ID No:2]
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