Title :
Modified lead-free potassium sodium niobate (KNN) and their properties
Author :
Alkoy, Ebru Mensur ; Yavuz, Ayse Berksoy ; Alkoy, S.
Author_Institution :
Fac. of Eng. & Natural Sci., Maltepe Univ., Istanbul, Turkey
Abstract :
In this study, effects of lithium and tantalum modification on the structural and dielectric properties of potassium sodium niobate (KNN) ceramics were investigated. All ceramics were fabricated by pressureless sintering technique. Li, Li-Ta modifications were improved densification and thus dielectric properties. The dielectric properties of Li and Ta modified KNN ceramics were analyzed using AC impedance spectroscopy as a function of frequency from 100 Hz to 10 MHz in temperature range from 673 K to 798 K.
Keywords :
ceramics; densification; high-frequency effects; lithium compounds; permittivity; potassium compounds; sintering; sodium compounds; (K0.50-xNa0.50-xLix)Nb1-yTayO3; (K0.50-xNa0.50-xLix)NbO3; AC impedance spectroscopy; densification; dielectric properties; frequency 100 Hz to 10 MHz; frequency function; modified lead-free potassium sodium niobate ceramics; pressureless sintering technique; structural properties; temperature 673 K to 798 K; Ceramics; Dielectrics; Impedance; Lead; Powders; Spectroscopy; Temperature measurement; Li and Li-Ta modified KNN; dielectric properties; impedance spectroscopy; lead-free;
Conference_Titel :
Ultrasonics Symposium (IUS), 2012 IEEE International
Conference_Location :
Dresden
Print_ISBN :
978-1-4673-4561-3
DOI :
10.1109/ULTSYM.2012.0555
