Preparation and electrical properties of nickel manganite Ni0.79Mn2.21O4 ceramics for NTC thermistors
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Ni0.79Mn2.21O4 ceramics were prepared using the mixed-oxide method. All specimens displayed the typical XRD patterns of asingle-phase cubic polycrystalline structure. The average grain size of the specimen sintered at 1200 oC was approximately6.65 μm. All specimens exhibited the typical NTC thermistor characteristic where the electrical resistance exponentiallydecreases with an increase in temperature. The conduction process can be explained well by the nearest neighbor hopping(NNH) mechanism. The NTC property, activation energy, B25/50 constant and resistivity at room temperature of theNi0.79Mn2.21O4 specimen sintered at 1150 oC were -4.2%/oC, 4024 K, 0.329 eV and 3360 Ω·cm, respectively. These values aregood enough to be applied to NTC thermistor devices.
Abstract
Ni0.79Mn2.21O4 ceramics were prepared using the mixed-oxide method. All specimens displayed the typical XRD patterns of asingle-phase cubic polycrystalline structure. The average grain size of the specimen sintered at 1200 oC was approximately6.65 μm. All specimens exhibited the typical NTC thermistor characteristic where the electrical resistance exponentiallydecreases with an increase in temperature. The conduction process can be explained well by the nearest neighbor hopping(NNH) mechanism. The NTC property, activation energy, B25/50 constant and resistivity at room temperature of theNi0.79Mn2.21O4 specimen sintered at 1150 oC were -4.2%/oC, 4024 K, 0.329 eV and 3360 Ω·cm, respectively. These values aregood enough to be applied to NTC thermistor devices.
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