Hydrothermal Synthesis and Microwave Sintering of (K0.5Na0.5)NbO3 Ceramics

Title
Hydrothermal Synthesis and Microwave Sintering of (K0.5Na0.5)NbO3 Ceramics
Authors
정대용이성화송현철최경호조진호
Keywords
Hydrothermal; Piezoelectrics; Microwave sintering; Lead-free
Issue Date
2011-03
Publisher
Journal of the Korean Physical Society
Citation
VOL 58, NO 3, 663-667
Abstract
Lead-free piezoelectric ceramics of (K0.5Na0.5)NbO3 (KNN) were produced by using hydrothermally synthesized KNbO3 (KN) and NaNbO3 (NN) powders in a microwave furnace to reduce the volatilization of the alkaline elements. The KNN ceramics were synthesized by using a hydrothermal KN and NN mixed powder, a 1 mol% CuO-added hydrothermal KN and NN mixed powder and KNN calcined at various temperatures. The hydrothermal KN and NN powder and the calcined KNN powder had a pure perovskite phase while KNN ceramics with 1 mol% CuO showed a pyrochlore second phase. The CuO-added KNN ceramics sintered at 1050 ℃ for a short sintering time of 5 min at a fast heating rate of 50 ℃/min to prevent evaporation of K2O and Na2O showed the highest piezoelectric properties (d33 = 89 pC/N and kp = 0.28). The X-ray diffraction and the scanning electron microscopy results indicate that fast heating and short sintering time can affect the phase formation sequence in KNN ceramics.
URI
http://pubs.kist.re.kr/handle/201004/39510
ISSN
0374-4884
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