Some electrical characteristics of Li0.5CrxFe2.25-xO4 spinel structures

Some of the electrical properties of chromium-substituted spinel Li0.5CrFe2.25-xO4 with 0.15 less than or equal to x less than or equal to 1.85, synthesized at 1200degreesC for 12h, are examined through impedance. measurements and analysis. The electrical resistivity, relaxation frequencies and dielectric constant of Li0.5CrxFe2.25-xO4 have been investigated versus the composition x. The behavior of these can be satisfactorily described by a hopping mechanism of charge carriers between Fe2+ and Fe3+ ions on octahedral sites of the spinel lattice. (C) 2004 Elsevier Ltd and Techna Group S.r.l. All rights reserved.