Ferroelectric properties of Bi0.5(Na0.8K0.2)0.5TiO3 ceramics

JAVIER CAMARGO; LEANDRO ALFREDO RAMAJO; FERNANDO RUBIO-MARCOS; MIRIAM SUSANA CASTRO

Joao Pessoa

Congreso; 6th International Conference on Electroceramics; 2013

International Conference on Electroceramics

Lead titanate-zirconate piezoceramics are the most important and widely used materials for piezoelectric transducers, transformers and sensors. However, the toxicity of lead is a serious threat to human health and environment. Then, numerous studies on lead-free piezoelectric ceramics such as (K,Na)NbO3, BaTiO3-based, Bi-layered, bismuth sodium titanate and tungsten bronze-type materials have been recently published. In this way, other piezoelectric compositions, such as Bi0.5Na0.5TiO3 (BNT), Bi0.5K0.5TiO3 (BKT), and the Bi0.5(Na0.8K0.2)0.5TiO3 (BNKT) binary system have been studied due to their excellent piezoelectric and ferroelectric properties in the rhombohedric-tetragonal morphotropic border. In this paper, lead-free Bi0.5(Na0.8K0.2)0.5TiO3-based ceramics were prepared by the solid state reaction method. Results were discussed considering the effect of secondary phases on structure, microstructure, dielectric and piezoelectric properties of these ceramics.