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3.1. Transport properties
The transport properties of the CuFe2−xMnxO4 system were studied by investigating the conductivity (σ) and the Seebeck (S) dependence on both temperature and composition ( Figs. 8a,b and 9a,b). Irrespective of the x value, the CuFe2−xMnxO4 system demonstrates hemagglutinin 332-340 semiconducting behavior due to the conductivity increase with temperature ( Fig. 8b).
Full-size image (41 K)
Fig. 8.
Conductivity dependence of the CuFe2−xMnxO4 system on the composition (at 298 K) (a) and temperature (b).
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Full-size image (42 K)
Fig. 9.
Arrhenius plot of the CuFe2−xMnxO4 system (a) and activation energy (ΔEσ) dependence (b).
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Table 3.
Transport properties of the system CuFe2−xMnxO4 (0 ≤ x ≤ 2).
Nominal composition S (μV/K) ΔEs (eV) N0/NA (%) NA (cm−3) σ (Ω cm−1) ΔEσ (eV) μ (cm2 Vs−1)
0 +483 0.15 270.42 9.75 × 1019 8.40 × 10−4 0.08 5.38 × 10−5
0.4 +941 0.29 10.91 241 × 1019 15.6 × 10−4 0.15 0.40 × 10−5