Abstract
Abstract Polycrystalline nano grain size Na0.5Bi0.5TiO3 (NBT) system is synthesized by using modified sol–gel method. X-ray diffraction (XRD), Transmission electron microscopy (TEM) studies and Field emission scanning electron microscopy (FESEM) are employed for structural and morphological confirmation. Electrochemical transport properties of this nano system have been investigated systematically in the range of temperature (30 °C−450 °C) and frequency (100 Hz−1 MHz) with the help of complex impedance spectroscopic technique. From impedance and modulus results, two (one at low and another at high temperature regime) positive temperature coefficient of resistance (PTCR) to negative temperature coefficient of resistance (NTCR) transitions are observed which is useful for electrochemical temperature sensor application. From electric transport analysis it found that due to small polaron hopping of charge carriers at NBT-NBT interfaces system shown PTCR nature. However, the system has shown both −ve magnetoresistance [MR (%)] and magnetocapacitance [MC (%)] at RT due to overlapping of large polaron tunnelling (OLPT) at NBT-NBT interfaces (which is explored with the help of magnetic transport analysis).
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