Electrical properties of ternary system Bi<inf>0.5</inf>(Na<inf>0.80</inf>K<inf>0.20</inf>)<inf>0.5</inf>TiO<inf>3</inf>-0.005LiNbO<inf>3</inf>-BaTiO<inf>3</inf> lead-free piezoelectric ceramics

• Main Authors: Wannasut P., Jaita P., Watcharapasorn A., Jiansirisomboon S.
• Format: Journal
• Published: 2017
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84982300284&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/41439
• Institution: Chiang Mai University

© 2016 Taylor & Francis Group, LLC. Ternary system of lead-free piezoelectric ceramics with the formula of (1-x-y)Bi 0.5 (Na 0.80 K 0.20 ) 0.5 TiO 3 -xLiNbO 3 -yBaTiO 3 or (1-x-y)BNKT-xLN-yBT (x = 0.005 and y = 0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06 and 0.07 mol fraction) were sintered at the temperature of 1125°C for 2 h. All samples have the density ranging of 5.59 - 5.73 g/cm 3 . X-ray diffraction pattern exhibited a single perovskite structure without any secondary phase. Scanning electron micrographs indicated a cubic-like grain shape occurred for all compositions with side length of 0.49 - 0.77 μm. At a composition BNKT-0.005LN-0.04BT showed the highest piezoelectric coefficient (d 33 = 198 pC/N) with good dielectric (ϵ r = 1775, tanδ = 0.0534) and ferroelectric properties (P r = 17.36 μC/cm 2 , R sq = 1.67).