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EXAFS study of the Jahn-Teller distortion in layered nickel oxyhydroxide

Demourgues, A., Gautier, L., Chadwick, Alan V., Delmas, C. (1997) EXAFS study of the Jahn-Teller distortion in layered nickel oxyhydroxide. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 33 . pp. 39-44. ISSN 0168-583X. (doi:10.1016/S0168-583X(97)00459-X) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided) (KAR id:18395)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided.
Official URL:
http://dx.doi.org/10.1016/S0168-583X(97)00459-X

Abstract

The local environment of Ni-III ions in the HNiO2 oxyhydroxide has been studied by Ni-K edge EXAFS and compared to those of various layered nickelates. The Ni-III site in the beta(III)-HNiO2 phase exhibits a Jahn-Teller distortion, as in LiNiO2 or NaNiO2, characterized by four Ni-O distances at 1.87 Angstrom and two long ones at 2.03 Angstrom. A very strong hydrogen bonding network frustrates the cooperative Jahn-Teller distortion observed in NaNiO2 and leads to the occurrence of four short Ni-Ni distances at 2.82 Angstrom and two long ones at 3.03 Angstrom. Such a distance distribution may explain the very pronounced broadening of the X-ray diffraction lines. In the gamma-oxyhydroxide containing Ni-III and Ni-IV ions, the Jahn-Teller distortion of Ni sites observed in ANiO(2) (A = H, Li, Na) phases has disappeared as a result of the Ni-III/Ni-IV hopping. (C) 1997 Elsevier Science B.V.

Item Type: Article
DOI/Identification number: 10.1016/S0168-583X(97)00459-X
Depositing User: T. Nasir
Date Deposited: 24 Oct 2009 14:22 UTC
Last Modified: 16 Nov 2021 09:56 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/18395 (The current URI for this page, for reference purposes)

University of Kent Author Information

Chadwick, Alan V..

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