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The current manuscript describes the structure, dielectric and impedance nature of the ferroelectric ceramic Na 2 Ba 2 Y 2 W 2 Ti 4 Nb 4 O 30  made by high temperature mixed oxide route. The compound formation with orthorhombic phase and surface morphology was verified by X-ray diffraction and scanning electron microscopy techniques respectively. The temperature variation of dielectric parameters (ε r  and tan δ) at selected frequencies of the material exhibits dual phase transitions at 323 and 573 K, respectively. The low temperature phase transition is considered as structural type in the ferroelectric phase and the high temperature (573 K) transition is related to transformation from ferroelectric phase to paraelectric phase. The room temperature polarization curve is plotted to assure the ferroelectricity in the ceramic. The frequency dependent impedance parameters at given temperature range determines the contribution of both bulk and grain boundary effects in it. The intrinsic resistance due to grains of the material follows opposite trend with temperature like semiconductors. Temperature dependent bulk resistance is used to obtain various thermistor parameters and their variation with temperature is discussed. Jonscher’s law is referred to understand the frequency dependent ac conductivity and it’s various temperature dependent parameters (A and n).

Crystal structure, dielectric and impedance studies of a new lead free tungsten bronze ferroelectric oxide