Effects of NaNbO<inf>3</inf> crystals on electrical properties of K<inf>0.5</inf>Na<inf>0.5</inf>NbO<inf>3</inf> ceramics

• Main Authors: Suksri C., Parjansri P., Thonglem S., Intatha U., Eitssayeam S., Tunkasiri T.
• Format: Book Series
• Published: 2017
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84970038679&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/42465
• Institution: Chiang Mai University

© 2016 Trans Tech Publications, Switzerland. Lead-free (K 0.5 Na 0.5 )NbO 3 (KNN) piezoelectric ceramics were studied and synthesized by the seed-induced method. NaNbO 3 crystal was used as the seed and was prepared by molten salt synthesis (MSS). The average particles size of the NaNbO 3 seed crystal was about 1-3 ìm. Then, the NaNbO 3 seed was mixed with KNN powder and ball milled for 24 h. The mixed powder was calcined at 700-900 °C and sintered at 1100 °C. The phase structure and morphology of the ceramics were investigated by X-ray diffraction and scanning electron microscope and the electrical properties were measured. The results indicated that all samples showed a pure perovskite phase. The highest density of the ceramic was 93% compared to the theoretical density. The results showed that NaNbO 3 seed crystal improved the piezoelectric properties of KNN ceramics.