Effect of Calcination Kinetics and Microwave Sintering Parameters on Dielectric and Peizo-Electric Properties of(K۰.۵Na۰.۵) NBO۳ Ceramics

An efficient solid-state approach was established to synthesize (K۰.۵Na۰.۵) NbO۳ ceramics using calcination kinetics and microwave assisted sintering. Milling of carbonate and oxide raw materials were carried out for ۱۵h to obtain homogeneous nano particles. The crystallite size of ۵.۳۰ 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 processing , Piezo-electric properties.