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| Article Name : | | | ELECTRICAL DC CONDUCTIVITY AND THERMOELECTRIC POWER OF Mg–Cd FERRITES | | Author Name : | | | S. S. Karande and B. R. Karche | | Publisher : | | | Ashok Yakkaldevi | | Article Series No. : | | | ROR-1585 | | Article : | |  | Author Profile | | Abstract : | | | Thermoelectric power (α) and Dc electrical resistivity (ρ) of polycrystalline Cdx Mg1-x Fe2O4 (x = 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0) ferrite system is studied as a function of Temperature in the range of 300 – 800 K. The Variation of DC resistivity (ρ) and thermo-electro motive force (α) with temperature shows that the samples are of degenerate type semiconductors. The Positive sign of Seeback coefficient (α) and drift mobility (μd) of the order of 10-9 cm2/Vsec indicates the compositions exhibits P- type semiconducting behaviour in the entire temperature range. P-type semi conducting behavior of the samples is attributed to the presence of Alpha lacunar phase (γ Fe2 O3) called Superstructure having hole trapping cation vacancies in octahedral (B) site. The presence of Fe2+ takes place the Fe2+ ↔ Fe3+ + e- transition. DC conductivity mechanism is explained on the basis of thermally activated electron hopping model. Decrease in electrical resistivity with Cd2+ content revealed that the Conductivity arises only due to drift mobility (μd) and not due to number of charge carriers in the same sample increases hopping length increases hopping Probability results more μd. . | | Keywords : | | - Curie Temperature,Curie Temperature,Curie Temperature,Curie Temperature
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