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Crystal structures and magnetic properties of dimorphic Li3OsO4

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Feng,  Hai L.
Physics of Correlated Matter, 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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Jansen,  Martin
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Feng, H. L., Reehuis, M., Hoser, A., Valldor, M., & Jansen, M. (2019). Crystal structures and magnetic properties of dimorphic Li3OsO4. Solid State Sciences, 97: 106009, pp. 1-6. doi:10.1016/j.solidstatesciences.2019.106009.


Cite as: http://hdl.handle.net/21.11116/0000-0005-81C4-B
Abstract
Rocksalt-type oxides Li3OsO4 with disordered and ordered arrangements of Li and Os were synthesized. The disordered phase crystallizes in the ideal rocksalt structure with cubic space group Fm3m , while the ordered polymorph adopts the monoclinic Na3BiO4-type structure (space group P2/c). The analyses of X-ray and neutron diffraction data of monoclinic Li3OsO4 indicate that there is a considerable anti-site disorder of Li and Os and that the sample is nonstoichiometric [Li3.045(5)Os0.955(5)O4]. In monoclinic Li3OsO4 the OsO6 octahedra are not isolated from each other but they form edge-sharing zigzag chains. Both cubic and monoclinic Li3OsO4 are electrically semiconducting. Cubic Li3OsO4 does not show any sign of magnetic order down to 2 K, whereas the chi(T) data of monoclinic Li3OsO4 display an anomaly at 310 K. However, the neutron diffraction study indicated no evidence of long-range magnetic order. The anomaly at 310 K may be caused by short-range antiferromagnetic ordering within the individual Os chains.