X-ray diffraction patterns of Mg0.5−xCuxZn0.5Fe1.9O4−δ.
Variation of DC electrical conductivity with copper concentration in Mg0.5−xCuxZn0.5Fe1.9O4−δ.
Variation of DC electrical conductivity with temperature in Mg0.5−xCuxZn0.5Fe1.9O4−δ.
Table 1
Activation energies from DC conductivity studies and mobility of Mg0.5−xCuxZn0.5Fe1.9O4−δ.
| From DC conductivity | From mobility | |||
|---|---|---|---|---|
| Copper content | Region I | Region II | Region I | Region II |
| x | ΔE1 [eV] | ΔE2 [eV] | ΔE1 [eV] | ΔE2 [eV] |
| 0.1 | 0.45 | 0.66 | 0.23 | 0.61 |
| 0.15 | 0.35 | 0.87 | 0.39 | 0.86 |
| 0.2 | 0.36 | 0.92 | 0.29 | 0.81 |
| 0.25 | 0.73 | 0.9 | 0.26 | 0.84 |
Variation of Seebeck coefficient with copper concentration in iron deficient ferrite series.
Variation of Seebeck coefficient with temperature in Mg0.5−xCuxZn0.5Fe1.9O4−δ.
Temperature dependence of mobility µ in Mg0.5−xCuxZn0.5Fe1.9O4−δ (a) x = 0.1 and (b) x = 0.15 to 0.25.