Abstract
The electrical conductivity of Mn a 2+Zn b 2+Fe c 2+Fe 2 3+O 4 2− (0.52⩽ a⩽0.72, 0.20⩽ b⩽0.43, 0.0023⩽ c⩽0.14) single crystals was measured in the temperature range of 80–300 K. Electrical conductivity increases monotonously with the concentration of Fe 2+ ions. The activation energy for hopping conduction is 0.024–0.27 eV and shows its minimum value in the vicinity of c=0.06. Due to low carrier mobility, a small polaron effect is expected to be important at c<0.06. In contrast, the high carrier mobility at c>0.06 suggests that the Coulomb interaction between carriers increases with the Fe 2+ ion concentration. Polaron binding energy and Coulmb interaction are considered to result in additional activation energy for hopping conduction. Thus, the electrical conduction mechanism of ferrite is understood as the result of competition between the polaron effect and electron–electron interactions.
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