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Journal of Materials Science

, Volume 42, Issue 10, pp 3343–3348 | Cite as

EPR analysis of the local structure of Ni3+ ions in Ni-based electrode materials obtained under high-pressure

  • Ekaterina ZhechevaEmail author
  • Radostina Stoyanova
  • Elitza Shinova
Size-Dependent Effects

Abstract

X-band and high-frequency EPR spectroscopy was applied to monitor the short-range cation ordering in Ga, Al and Li substituted LiNiO2 with a layered crystal structure. The mixed oxides were obtained by a high-pressure synthesis in an oxygen rich atmosphere. Analysis of the EPR line-width from the X-band experiments together with the values of the g-tensor from the high-frequency EPR experiments permits assesing the local structure of the mixed metal layers. The results obtained show that LiGayNi1−yO2, LiAlyNi1−yO2 and Li1 + xNi1−xO2 are homogeneous solid solutions, whereas the Li1 + xNi1−xyAlyO2 compositions have rather a complex domain structure of the type (1−a)LiAlyNi1−yO2.aLi[Li1/3Ni2/3]O2.

Keywords

Electron Paramagnetic Resonance Electron Paramagnetic Resonance Spectrum Electron Paramagnetic Resonance Signal Electron Paramagnetic Resonance Spectroscopy Li2TiO3 

Notes

Acknowledgements

The authors thank the National Science Fund of Bulgaria (Contract no. Ch1304/2003) for financial support. R.S. and E.Sh. are grateful to the EC for a grant of a EU “Research Infrastructures: Transnational Access” Programme (Contract No. 505320 (RITA) – High Pressure) for performing high-pressure synthesis experiments at the Bayrisches Geoinstitute. The high-frequency EPR measurements carried out at High Magnetic Field Laboraty in Grenoble, France, were supported by the European Commission within the 6th framework programme “Transnational Access - Specific Support Action” (contract No. RITA-CT-2003-505474) – “Access to research in very high magnetic field”. The authors are very grateful to Dr. T. Boffa-Ballaran and Dr. C. McCammon, from Bayerisches Geoinstitut, Universität Bayreuth, and Dr. A.-L. Barra, from High Magnetic Field Laboratory in Grenoble, for their help.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Ekaterina Zhecheva
    • 1
    Email author
  • Radostina Stoyanova
    • 1
  • Elitza Shinova
    • 1
  1. 1.Institute of General and Inorganic ChemistryBulgarian Academy of SciencesSofiaBulgaria

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