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Chemical Synthesis and Properties of Layered Co1-yNiyO2-δOxides (0≤y≤1)

Published online by Cambridge University Press:  18 March 2011

A. Manthiram ,
R. V. Chebiam  and
F. Prado
A. Manthiram
Affiliation:
Texas Materials Institute, ETC 9.104, University of Texas at Austin, Austin, TX 78712
R. V. Chebiam
Affiliation:
Texas Materials Institute, ETC 9.104, University of Texas at Austin, Austin, TX 78712
F. Prado
Affiliation:
Texas Materials Institute, ETC 9.104, University of Texas at Austin, Austin, TX 78712
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Abstract

Layered Co1-yNiyO2-δ oxides with 0≤y≤1 have been synthesized by chemically extracting lithium from LiNi1-yCoyO2 with NO2PF6 at ambient temperature. The samples have been characterized by X-ray diffraction, wet-chemical analyses, infrared spectroscopy, and magnetic susceptibility measurements. While NiO2-δ retains the initial O3 (CdCl2 structure) layer structure of LiNiO2, CoO2-δ consists of a mixture of P3 and O1 (CdI2 structure) phases that are formed by a sliding of the oxide ions in the initial O3 structure. CoO2-δ and NiO2-δ have oxygen contents of, respectively, 1.67 and 1.95 and the oxygen content increases with increasing Ni content, y, in Co1-yNiyO2-δ. While CoO2-δ exhibits metallic conductivity as revealed by theabsence of absorption bands in the infrared spectrum, NiO2-δ exhibits semiconducting behavior due to a completely filled t2g band. Magnetic data reveal a transition from antiferromagnetic to ferromagnetic correlations as the Ni content in Co1-yNiyO2-δ increases.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 658: Symposium GG – Solid-State Chemistry of Inorganic Materials III , 2000 , GG82.1
Copyright
Copyright © Materials Research Society 2001

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