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Title: Microstructural studies of AgNbO{sub 3} ceramic by using complex impedance spectroscopy

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 AgNbO{sub 3} 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{sub b}), resistance (R{sub b}) and electrical conductivity (σ{sub 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.
Authors:
; ; ;  [1]
  1. Advanced Functional Materials Laboratory, Department of Physics, Indian Institute of Technology Hyderabad-502205 (India)
Publication Date:
OSTI Identifier:
22490516
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1665; Journal Issue: 1; Conference: 59. DAE solid state physics symposium 2014, Tamilnadu (India), 16-20 Dec 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ACTIVATION ENERGY; CAPACITANCE; CERAMICS; CHARGE CARRIERS; ELECTRIC CONDUCTIVITY; ELECTRON SCANNING; GRAIN SIZE; IMPEDANCE; NIOBATES; ORTHORHOMBIC LATTICES; PEROVSKITE; PIEZOELECTRICITY; RELAXATION; SILVER COMPOUNDS; SOLIDS; VACANCIES; X-RAY DIFFRACTION