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Semiconductor to Metallic Phase Transition in Nickel Doped Co0.5Ni X Fe(0.5−X) Fe2O4

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Abstract

Co0.5Ni X Fe(0.5−X) Fe2O4 of composition (X=0.1 to 0.5) has been prepared by sol gel auto combustion citrate nitrate method. The molar ratio of metal nitrates to citric acid was maintained as 1:3 to obtain the small crystallite size. A systematic study of XRD, impedance, ac conductivity and dielectric studies of the samples were carried out in the present work. A semiconducting to metallic changeover accompanied by the grain boundary effect gradually replaced by grain contribution has been found from the impedance analysis. Confirmation of phase transition is also obtained from ac conductivity and dielectric analysis of activation energy graph where the slope changes from negative to positive. Nickel doped cobalt ferrite exhibits a semiconducting nature up to 513 K for all the compositions and underwent to metallic phase above 513 K. It is attributed to cation distribution between A and B sites as a function of temperature.

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Acknowledgements

All the prepared nanocobalt ferrite samples are characterized by PXRD using XPERT-PRO X-ray Diffractometer available at Alagappa University, Karaikudi. Impedance analysis was carried out using impedance analyzer (USA Make) in the frequency range 0.1 Hz to 1 MHz at CIF, Pondicherry University. This work has been supported by the grant in aid of AICTE-RPS project of R. Kannan, of Department of Physics, Pondicherry Engineering College, Pondicherry.

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Authors and Affiliations

  1. Department of Physics, Pondicherry Engineering College, Puducherry, 605014, India

    D. Vanidha, A. Arunkumar & R. Kannan

  2. Department of Chemistry, Pondicherry Engineering College, Puducherry, 605014, India

    S. Rajagopan

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  1. D. Vanidha
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  2. A. Arunkumar
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  4. R. Kannan
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Correspondence to R. Kannan.

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Vanidha, D., Arunkumar, A., Rajagopan, S. et al. Semiconductor to Metallic Phase Transition in Nickel Doped Co0.5Ni X Fe(0.5−X) Fe2O4 . J Supercond Nov Magn 26, 173–182 (2013). https://doi.org/10.1007/s10948-012-1705-z

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  • DOI: https://doi.org/10.1007/s10948-012-1705-z

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