Electrical and microstructural properties of CaTiO3-doped K 1/2Na1/2NbO3-lead free ceramics

Abstract

Microstructure, electrical properties and dielectric behaviour of K 1/2Na1/2NbO3 (KNN) and CaTiO 3-modified K1/2Na1/2NbO3 (CTO-KNN) systems, were investigated. Discs doped with 0 to 0.55% mol of CaTiO3 (CTO) were sintered at 1125°C for 2 h. Although minority phases were found in doped samples, CaTiO3 was not detected. It was also observed that CTO changed the microstructure and grain size of KNN drastically. Also, the Curie temperature and permittivity values decreased. Addition of CTO between 0.15 and 0.45 mol% decreases the density and dielectric values. Samples prepared with higher content of CTO than 0.45 mol% showed better electrical properties. © Indian Academy of Sciences.