Improvement of sinterability of KNN ceramics by mechanochemical activation-assisted process
by Jae-Ho Jeon; Hyun Ae Cha
International Journal of Materials and Product Technology (IJMPT), Vol. 51, No. 3, 2015

Abstract: In order to enhance the sintered density of K_0.5Na_0.5NbO₃ [KNN] ceramics by using fine KNN powders, mechanochemical activation-assisted process was applied for the synthesis of KNN powders. Shaker milling of K₂CO₃-Na₂CO₃-Nb₂O₅ raw powders mixture for 30 min could decrease the temperature of the subsequent calcination from 800-850°C of the conventional solid-state reaction to 500°C. This novel process produced KNN powders with crystallites of 50-100 nm in size. The relative density of sintered KNN prepared by mechanochemical activation-assisted process was 95.7%, which was about 2% higher than that of sintered KNN prepared by the conventional solid-state reaction process. Mechanochemical activation-assisted process also improved the P-E property of sintered KNN ceramics.

Online publication date: Tue, 06-Oct-2015

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