Soft ferromagnetism and semiconductor to metal transition in Li[sub 0.5]Mn[sub 0.5]Fe[sub 2]O[sub 4] ferrite

Li0.5Mn0.5Fe2O4 ferrite has been prepared by solid state sintering route. XRD pattern showed single phased cubic spinel structure. The samples exhibited typical character of plastoferrite with ring shaped surface microstructure. New feature observed in the present ferrite is the frequency activated conductivity transition from semiconductor to metallic state above 800 K. The increase of conductivity with frequency in the semiconducting regime follows Jonscher power law, while decrease of conductivity in metallic regime obeys Drude equation. The conductivity in semiconductor regime has been understood by hopping mechanism of localized charge carriers among the cations in B sites of cubic spinel structure. At higher temperatures, overlapping of electronic orbitals from neighbouring ions and free particle like motion of lighter Li+ ions among interstitial lattices contributed metallic conductivity. The samples provided evidence of localized nature of the charge carriers at lower temperatures and increasing delocalized character with the increase of measurement temperature. From application point of view, such ferrites behave as semiconductor at low temperature and allow electromagnetic wave to pass through, but transform into a metallic reflector with negative dielectric constant at high temperature.

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Temperature- and frequency-activated semiconductor-to-metal transition in soft ferromagnetic Li_0.5Mn_0.5Fe₂O₄ferrite

Bhowmik¹

2014

Mater. Res. Express

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Soft ferromagnetism and semiconductor to metal transition in Li[sub 0.5]Mn[sub 0.5]Fe[sub 2]O[sub 4] ferrite

Cited by 3 publications

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Temperature- and frequency-activated semiconductor-to-metal transition in soft ferromagnetic Li_0.5Mn_0.5Fe₂O₄ferrite

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Soft ferromagnetism and semiconductor to metal transition in Li[sub 0.5]Mn[sub 0.5]Fe[sub 2]O[sub 4] ferrite

Cited by 3 publications

References 0 publications

Investigation of the structural, optical, electrical and dielectric proprieties of LiCd0.5Fe2O4 spinel ferrite

Investigation of the structural, optical, electrical and dielectric proprieties of LiCd0.5Fe2O4 spinel ferrite

Study of microstructure and semiconductor to metallic conductivity transition in solid state sintered Li0.5Mn0.5Fe2O4−δ spinel ferrite

Temperature- and frequency-activated semiconductor-to-metal transition in soft ferromagnetic Li0.5Mn0.5Fe2O4ferrite

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Temperature- and frequency-activated semiconductor-to-metal transition in soft ferromagnetic Li_0.5Mn_0.5Fe₂O₄ferrite