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Electron energy-loss spectroscopy of LiMn2O4, LiMn1.6Ti0.4O4and LiMn1.5Ni0.5O4

Authors
Journal
Journal of Physics and Chemistry of Solids
0022-3697
Publisher
Elsevier
Publication Date
Volume
70
Issue
6
Identifiers
DOI: 10.1016/j.jpcs.2009.04.018
Keywords
  • A. Oxides
  • B. Sol–Gel Growth
  • C.Ab Initiocalculations
  • C. Electron Energy-Loss Spectroscopy (Eels)
  • D. Dielectric Properties

Abstract

Abstract The dielectric properties of LiMn 2O 4, LiMn 1.6Ti 0.4O 4 and LiMn 1.5Ni 0.5O 4 powders, synthesized by sol–gel method, were determined by analyzing the low-loss region of the electron energy-loss spectroscopy (EELS) spectrum in a transmission electron microscope. From these data, the optical joint density of states (OJDS) was obtained by Kramers–Kronig analysis. Since maxima observed in the OJDS spectra are assigned to interband transitions above the Fermi level, these spectra can be interpreted on the basis of calculated density of states (DOS), carried out with the CASTEP code. Experimental and theoretical results are in good agreement.

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