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- W2023647932 abstract "The DC electrical resistivity ρDC, thermoelectric power α, drift mobility μD of electric charge carriers and initial magnetic permeability μi were experimentally studied as a function of temperature T and composition x for a series of Ni1+xMnxFe2−2xO4 ferrite samples prepared using the usual ceramic technique. The experimental results show that, ρDC decreases while μD increases on increasing the temperature. The magnetic permeability μi increases as the temperature increases showing two peaks, the first is the Curie temperature Tc while the second is below room temperature (for samples with x=0.1, 0.2 and 0.3). ρDC,μi, activation energies (for electric conduction Ep in paramagnetic and Ef in ferrimagnetic region; and EH for hopping) increase on increasing Ni2+ and Mn4+ ions substitution to reach maximum at x=0.3 and start to decrease for x>0.3. The activation energy Ep is higher than Ef. The positive sign of α for Ni1.5Mn0.5Fe1O4 sample and negative sign for all other samples indicate that both types of charge carriers are responsible for electric conduction (the majority are holes for x=0.5 and electrons for all other samples). The Curie temperature Tc and thermoelectric power α decrease as Ni2+ and Mn4+ ion substitution increases. The studied Ni1+xMnxFe2−2xO4 ferrite samples have the magnetic semiconductor behavior. The small values of μD (from 10−10 to 10−5 cm2 V−2 s−1) and the strong temperature dependence of μD confirm that the hopping conduction mechanism is dominant." @default.
- W2023647932 created "2016-06-24" @default.
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- W2023647932 date "1999-09-01" @default.
- W2023647932 modified "2023-10-18" @default.
- W2023647932 title "Semiconductivity in Ni1+xMnxFe2−2xO4 ferrites" @default.
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- W2023647932 doi "https://doi.org/10.1016/s0304-8853(99)00363-7" @default.
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