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Thermoelectric power in Gd3+-substituted Cu-Cd ferrites

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Abstract

Polycrystalline Cd x Cu1−x Fe2−y Gd y O4 ferrites fory=0·0 and 0·1 were prepared by ceramic technique. X-ray diffractograms of powder samples show cubic symmetry withx⩾0·2 fory=0·0 and 0·1, while compositions withx=0·0 fory = 0·0 and 0·1 are tetragonal. The thermopower measurements for Gd3+-undoped ferrites in the temperature range 300 K to 788 K shown-type conductivity forx⩾0·2. The substitution of Gd3+ changedn-type conductivity of the compositions top-type. The mobilities calculated show decreasing trend on Gd3+ substitution. The values of activation energy ΔE and drift mobilityE d suggest polaron formation in substituted samples. The conduction mechanism is explained on the basis of localized model and formation of Gd3++Fe2+ stable pairs at B site and Cu1++Fe3+ at A site.

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  1. Post-Graduate Department of Physics, Shivaji University, 416 004, Kolhapur, India

    C B Kolekar, P N Kamble & A S Vaingankar

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  1. C B Kolekar
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  2. P N Kamble
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  3. A S Vaingankar
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Kolekar, C.B., Kamble, P.N. & Vaingankar, A.S. Thermoelectric power in Gd3+-substituted Cu-Cd ferrites. Bull. Mater. Sci. 18, 133–140 (1995). https://doi.org/10.1007/BF02747532

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  • DOI: https://doi.org/10.1007/BF02747532

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