Demourgues, A. and Gautier, L. and Chadwick, A.V. and Delmas, C. (1997) EXAFS study of the Jahn-Teller distortion in layered nickel oxyhydroxide. In: 1st International Conference on Synchrotron Radiation in Materials Science (ICSRMS 96), Jul 29 - Aug 02, 1996, Chicago, Illinois.
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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:||Conference or workshop item (Paper)|
|Depositing User:||T. Nasir|
|Date Deposited:||24 Oct 2009 14:22|
|Last Modified:||24 Oct 2009 14:22|
|Resource URI:||http://kar.kent.ac.uk/id/eprint/18395 (The current URI for this page, for reference purposes)|
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