Fabrication of lead-free ferroelectric ceramics from bismuth sodium potassium titanate based systems

Abstract

The research project investigated the effects of CoO additive on dielectric, ferroelectric, physical and mechanical properties of modified Bi0.5(Na0.81,K0.19)0.5TiO3 ceramics were investigated. The samples were synthesized by solid state reaction technique, where powders were calcined at 850 °C for 4 h and ceramics were sintered at 1,050 °C for 4 h which difference heating rate controlled i.e. 100, 300, and 600 °C/h for. The ceramics of BNKT/x wt.% CoO was added CoO by various x=0.00, 0.10, 0.20, 0.30, 0.60 and 0.90. Phase formation was determined by X-ray diffraction technique (XRD). The X-ray diffraction analysis of the ceramics suggests that all samples exhibited a perovskite structure. The dielectric properties under room temperature and various temperatures were also determined. Dielectric measurement data showed that the additive and heating rate controlled influenced dielectric constant and dielectric loss. Furthermore, the hysteresis loop behaviors slightly changed with increasing the CoO contents.