Author/Authors :
Nandini, R. N Department of Mechanical Engineering - R.V. College of Engineering - Bangalore, India , Krishna, M Department of Mechanical Engineering - R.V. College of Engineering - Bangalore, India , Suresh, A. V Department of Mechanical Engineering - BMS Institute of Technology - Bangalore, India , Narasimha Rao, K Department of Instrumentation and Applied Physics - Indian Institute of science - Bangalore, India
Abstract :
An efficient solid-state approach was established to synthesize (K0.5Na0.5) NbO3 ceramics using calcination kinetics and microwave assisted sintering. Milling of carbonate and oxide raw materials were carried out for 15 h to obtain homogeneous nano particles. The crystallite size of 5.30 nm was obtained for the KNN system after calcination through optimized parameters and observed to be stoichiometric in nature. The obtained nano particles showed phase transition from orthorhombic to tetragonal crystal structure without any secondary phases. The high relative density and tetragonality ratio of KNN ceramics obtained through optimized sintering parameters yielded with significant piezoelectric and ferroelectric properties.
Keywords :
KNN , Solid state method , Calcination kinetics , Microwave Sintering , Piezo-electric properties
