Crystal structure and elementary properties of Na{sub x}CoO{sub 2} (x=0.32, 0.51, 0.6, 0.75, and 0.92) in the three-layer NaCoO{sub 2} family
- Department of Chemistry, Princeton University, Princeton, New Jersey 08540 (United States)
- National Centre for HREM, Department of Nanoscience, Delft Institute of Technology, Al Delft, The Netherlands (Netherlands)
- NIST Center for Neutron Research, NIST, Gaithersburg, Maryland 20899 (United States)
- Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974 (United States)
- Department of Physics, Princeton University, Princeton, New Jersey 08540 (United States)
The crystal structures of Na{sub x}CoO{sub 2} phases based on three-layer NaCoO{sub 2}, with x=0.32, 0.51, 0.60, 0.75, and 0.92, determined by powder neutron diffraction, are reported. The structures have triangular CoO{sub 2} layers interleaved by sodium ions, and evolve with variation in Na content in a more complex way than has been observed in the two-layer Na{sub x}CoO{sub 2} system. The phases with highest and lowest Na content studied (x=0.92 and 0.32) are trigonal, with three CoO{sub 2} layers per cell and octahedral Na ion coordination. The intermediate compositions have monoclinic structures. The x=0.75 compound has one CoO{sub 2} layer per cell, with Na in octahedral coordination and an incommensurate superlattice. The x=0.6 and 0.51 phases are also single layer, but the Na is found in trigonal prismatic coordination. The magnetic behavior of the phases is similar to that observed in the two-layer system. Both the susceptibility and the electronic contribution to the specific heat are largest for x=0.6.
- OSTI ID:
- 20788155
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 17 Vol. 73; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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