Abstract
Electrical properties of Pb2Na0.8Eu0.2Nb4.8Fe0.2O15 tungsten bronze compound were investigated. Ferroelectric phase transition of diffuse type is observed at 395°C. Conductivity study as a function of temperature (RT-600°C) and at three different frequencies (10, 100 and 1000kHz) suggests the existence of dominant ionic conduction. The rise of ac conductivity on increasing temperature supports the NTCR (negative temperature coefficient of resistance) behaviour of the material. The activation energies have been evaluated from ac conductivity using Arrhenius equation and discussed. Different conduction mechanisms were identified. For comparison, the conducting properties of Pb2Na0.8R0.2Nb4.8Fe0.2O15 (R=Dy, Nd, La) were also investigated.
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