On the electrical behavior of nickel ferrite-gallates

The effect of substitution of iron ions by gallium on the AC electrical conduction is studied in the cubic ferrite system NiGa x Fe 2− x O 4 with x varying between (0.0 and 2.0). The variation of conductivity with temperature at different frequencies shows anomalies behavior at T∼500 K for all compo...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2000-02, Vol.210 (1), p.189-195
Main Authors: Fayek, M.K, Mostafa, M.F, Sayedahmed, F, Ata-Allah, S.S, Kaiser, M
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Conductivity phenomena in semiconductors and insulators
Correlated barrier hopping
Electrical conduction
Electronic transport in condensed matter
Exact sciences and technology
Hopping
Hopping mechanism
Mobility edges
hopping transport
Physics
Polarons
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Summary:The effect of substitution of iron ions by gallium on the AC electrical conduction is studied in the cubic ferrite system NiGa x Fe 2− x O 4 with x varying between (0.0 and 2.0). The variation of conductivity with temperature at different frequencies shows anomalies behavior at T∼500 K for all compositions with (0.33⩽ x⩽2.0). The presence of inflection may reflect unstable oxidation states of the cations over the studied temperature range (300–850 K). The conductivity behavior indicates two different temperature regions; low-temperature region, where the activation energy is constant and polarons may contribute to the conduction mechanism, and high-temperature region, where the activation energy increases with Ga concentration and correlated barrier hopping predominates.
ISSN:0304-8853
DOI:10.1016/S0304-8853(99)00612-5