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Structural, Transport and Magnetic Properties of KxCoO2 (x=0.36) |
| FU Guang-Cai1,2;DONG Cheng1;LI Ming-Xing2;GUO Juan1;YANG Li-Hong1 |
| 1National Laboratory for Superconductivity, Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080
2Department of Chemistry, Shanghai University, Shanghai 200436 |
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| Cite this article: |
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FU Guang-Cai, DONG Cheng, LI Ming-Xing et al 2005 Chin. Phys. Lett. 22 1478-1480 |
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Abstract Layered potassium cobaltate KxCoO2 with x=0.36 has been successfully synthesized in KOH fluxes at 480°C , and its hydrated form K0.36CoO2`yH2O (y≤0.8) has been obtained by intercalation with water. The diffraction peaks of K0.36CoO2 can be indexed by an orthorhombic cell similar to Na0.5CoO2, and K0.36CoO2`0.8H2O is isostructural with its sodium analog, monolayer hydrate NaxCoO2`yH2O. While the samples KxCoO2 and K0.36CoO2 yH2O (y <0.8) show semiconductor behaviour, a metal-insulator transition around 30K was observed in the sample KxCoO2`0.8H2O. Both the samples show complicated magnetic behaviour, and they are primarily paramagnetic in the range from 5K to 300K with a spin-glass-like transition around 56K.
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| Keywords:
61.10.Nz
74.20.Bf
75.30.Kz
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Published: 01 June 2005
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| PACS: |
61.10.Nz
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74.20.Bf
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75.30.Kz
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(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))
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