INFLUENCE OF MONOXIDES ADDITION ON SINTERING OF SODIUM-POTASSIUM NIOBATES SOLID SOLUTION

ABSTRACT

In this paper the preparation, structure and dielectric parameters of ceramics from different powders of pure potassium sodium niobate (KNN) and KNN doped with 1.0 wt% of Li₂O, CdO, Bi₂O₃, MnO₂, V₂O₅ and WO₃ have been studied. The dopping of sintering aids did not affect the crystallographic structure of the ceramics significantly; all ceramic samples had a single-phase perovskite structure. Added elements Li₂O, CdO, MnO₂, V₂O₅ effectively decreased the sintering temperature of KNN (50°–80°C). All sintering aids influenced sinterability, microstructure and dielectric properties of ceramics. Dielectric constant for doped samples increased from 6000 up to 8000.

Keywords:

• Lead-free
• piezoelectric
• sodium potassium niobate
• dielectric properties

ACKNOWLEDGMENTS

This work was supported by European Structural Founds ESF.