Abstract
The electric properties of the sodium niobate perovskite ceramic were investigated by impedance spectroscopy in the frequency range from 5 Hz to 13 MHz and from room temperature up to 1073 K, in a thermal cycle. Both capacitance and conductivity exhibit an anomaly at around 600 K as a function of the temperature and frequency. The electric conductivity as a function of angular frequency σ(ω) follows the relation σ(ω)=Aωs. The values of the exponent s lie in the range 0.15⩽s⩽0.44. These results were discussed considering the conduction mechanism as being a type of polaron hopping.
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