K, Gangaprasad and T, Durga Rao and Niranjan, Manish K and Asthana, Saket
(2015)
Microstructural studies of AgNbO3 ceramic by using complex impedance spectroscopy.
In: SOLID STATE PHYSICS: Proceedings of the 59th DAE Solid State Physics Symposium 2014, 16–20 December 2014, Tamilnadu, India.
Abstract
Lead-free piezoelectric silver niobate ceramic was synthesized by conventional solid state route. Room temperature X-ray diffraction pattern revealed that the sample crystallizes in single phase orthorhombic perovskite structure. Scanning electron micrographs of AgNbO3 ceramic showed that the average grain size is in the range 2–3 µm. The electrical properties were investigated by using impedance spectroscopy. Appearance of single semicircular arc in the Nyquist plot indicated the presence of grain contribution in the sample. Single RC parallel circuit model was employed to extract bulk capacitance (C b), resistance (R b) and electrical conductivity ( σ b). The activation energy calculated from impedance and modulus data indicate that same types of charge carriers (oxygen vacancy movements) are responsible for conduction and relaxation.
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