Abstract
The conduction mechanism in Mg2 + and Al3 + substituted Li0.5Fe2.5O4 with general formula Mg x Al2xLi0.5(1 − x)Fe2.5(1 − x)O4 (x = 0.0, 0.2, 0.5, 0.6 and 0.7) has been studied by means of compositional and temperature dependent d.c. resistivity, thermoelectric power and I–V characteristics measurements. It is found that ferrites are electronic conductors. For x = 0.0 and 0.2 conduction is due to holes, while for x = 0.5, 0.6 and 0.7 it is due to electrons. Thermal variation of mobilities and activation energies determined through d.c. resistivity measurements confirm the formation of small polarons. The sample with x = 0.0 exhibits switching phenomena.
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PANDYA, M.P., MODI, K.B. & JOSHI, H.H. Study of conduction mechanism in aluminium and magnesium co-substituted lithium ferrite. J Mater Sci 40, 5223–5232 (2005). https://doi.org/10.1007/s10853-005-4416-z
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DOI: https://doi.org/10.1007/s10853-005-4416-z