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Crystal structure and elementary properties of Na x Co O 2 ( x = 0.32 , 0.51, 0.6, 0.75, and 0.92) in the three-layer Na Co O 2 family

Crystal structure and elementary properties of Na x Co O 2 ( x = 0.32 , 0.51, 0.6, 0.75, and... The crystal structures of Na x Co O 2 phases based on three-layer Na Co O 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 Co O 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 x Co O 2 system. The phases with highest and lowest Na content studied ( x = 0.92 and 0.32) are trigonal, with three Co O 2 layers per cell and octahedral Na ion coordination. The intermediate compositions have monoclinic structures. The x = 0.75 compound has one Co O 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 . http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Crystal structure and elementary properties of Na x Co O 2 ( x = 0.32 , 0.51, 0.6, 0.75, and 0.92) in the three-layer Na Co O 2 family

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Publisher
American Physical Society (APS)
Copyright
Copyright © 2006 The American Physical Society
ISSN
1550-235X
DOI
10.1103/PhysRevB.73.174104
Publisher site
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Abstract

The crystal structures of Na x Co O 2 phases based on three-layer Na Co O 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 Co O 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 x Co O 2 system. The phases with highest and lowest Na content studied ( x = 0.92 and 0.32) are trigonal, with three Co O 2 layers per cell and octahedral Na ion coordination. The intermediate compositions have monoclinic structures. The x = 0.75 compound has one Co O 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 .

Journal

Physical Review B – American Physical Society (APS)

Published: May 1, 2006

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