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Synthesis and characterization of the pseudo-hexagonal hollandites ALi2Ru6O12 (A=Na, K) |
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| Authors: | ML Foo T He HW Zandbergen G Lawes RJ Cava |
| Institution: | a Department of Chemistry, Princeton University, Princeton, NJ, USA b Dupont Central Research and Development, Wilmington, DE, USA c Center for Neutron Research, NIST, Gaithersburg, MD, USA d National Center for High Resolution Electron Microscopy, Delft Institute of Technology, Delft, The Netherlands e Lucent Technologies, Bell Labs, Murray Hill, NJ, USA f Department of Astronomy and Physics, Wayne State University, Detroit, MI, USA |
| Abstract: | The crystal structures, synthesis and physical properties of ruthenium hollandites ALi2Ru6O12 (A=Na, K) with a new pseudo-hexagonal structure type are described. Analogous to tetragonal hollandites, the framework is made of MO6 octahedra in double chains that share corner oxygens with each other to create interstitial tunnels. The tunnels are either hexagonal or triangular in cross-section. Magnetic susceptibilities, low temperature specific heat, and electrical resistivities are reported. The data indicate that these materials are normal, low density of states metals. This new structure type can be extended from A=Group I to A=Group II ions with the synthesis of CaLi2Ru6O12 and SrLi2Ru6O12. |
| Keywords: | Ruthenates Hollandites Pseudo-hexagonal Neutron diffraction Electron diffraction Specific heat Magnetic susceptibility Single-crystal X-ray diffraction |
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