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Vol. 4, No. 2 (Spring 2018) 7-15   

Link: http://www.acerp.ir/Vol4/No2/2.pdf
 
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  Studying the effects of nano sintering additives on microstructure and electrical properties of potassium-sodium niobate piezoceramics
 
R. Hayati*, R. Bazargan Lari, M. A. Askari Zamani and Z. Balak
 
( Received: July 29, 2018 – Accepted in Revised Form: October 31, 2018 )
 
 

Abstract    In this paper, lead free (K0.48,Na0.52)NbO3 (KNN(48-52)) piezoelectric ceramics were made by conventional solid state sintering process. Additives of nano ZnO (n-ZnO), nano CuO (n-CuO) and nano SnO2 (n-SnO2) were used in order to decrease the sintering temperature, as well as modifying the dielectric, piezoelectric and ferroelectric properties. Phase structure and microstructure were analyzed using X-ray diffractometry and scanning electron microscopy techniques. The largest piezoelectric constant of d33= 150 pC/N was obtained for KNN (48-52) with 0.6 mol% n-ZnO at sintering temperature of 1070 °C, which is two times larger than that of pure KNN (48-52) at higher sintering temperatures. Additionally, KNN(48-52) ceramics co-doped with 0.8 mol% n-ZnO, 0.5 mol% n-CuO and 0.8 mol% n-SnO2, showed dielectric and piezoelectric properties of d33= 97 pC/N, tanδ = 0.006 and εr = 172 at sintering temperature of 960 ◦C, which are much better than corresponding values for pure KNN at 1110 ºC.

 

Keywords    (K0.48Na0.52) NbO3, nano sintering additives, piezoelectric properties, dielectric properties

 

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