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Fused Perovskite Tunnel Structures in Ba5Fe6+xS4+xO8 (0.44≤x≤0.55) with x-Dependent Two-Stage Magnetizations

MPG-Autoren
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Wright,  Taylor
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Prots,  Yurii
Yuri Prots, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Valldor,  Martin
Martin Valldor, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Zitation

Wright, T., Prots, Y., & Valldor, M. (2016). Fused Perovskite Tunnel Structures in Ba5Fe6+xS4+xO8 (0.44≤x≤0.55) with x-Dependent Two-Stage Magnetizations. CHEMISTRY-A EUROPEAN JOURNAL, 22(32), 11303-11309. doi:10.1002/chem.201600997.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-002B-9AEF-E
Zusammenfassung
Ba5Fe6+xS4+xO8 was synthesized through a solid-state reaction, and pure powders of nominal compositions x=0.44-0.55 were obtained after being rinsed with water. The crystal structures (P4/mmm, a=10.13, c=4.03 angstrom) and sample purities were investigated by powder synchrotron Xray diffraction and were found to be composed of a tunnel lattice (Ba5Fe6S4O8), built from fused perovskite units and the tunnel filling (FexSx). The variable composition, that is, the tunnel filling (x), causes partially occupied sites as well as crystallographic split positions. Ba5Fe6+xS4+xO8 (x=0.525) is semiconducting and all investigated compositions exhibit magnetic ground states that could be described as either semi-spin-glass-like (x>0.5) or canted antiferromagnetic (x<0.5). The spin- glass in x=0.525 exhibits magnetic relaxations that are affected by ageing.