Effect of composition on electrical properties of lead-free Bi<inf>0.5</inf>(Na<inf>0.80</inf>K<inf>0.20</inf>)<inf>0.5</inf>TiO<inf>3</inf>-(Ba<inf>0.98</inf>Nd<inf>0.02</inf>)TiO<inf>3</inf>piezoelectric ceramics

• Main Authors: Pharatree Jaita, Anucha Watcharapasorn, Sukanda Jiansirisomboon
• Format: Journal
• Published: 2018
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84880381635&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/47814
• Institution: Chiang Mai University

Lead-free piezoelectric ceramics with the composition of (1-x)Bi 0.5 (Na 0.80 K 0.20 ) 0.5 TiO 3 -x(Ba 0.98 Nd 0.02 )TiO 3 or (1-x) BNKT-xBNdT (with x = 0-0.20 mol fraction) have been synthesized by a conventional mixed-oxide method. The compositional dependence of phase structure and electrical properties of the ceramics were systemically studied. The optimum sintering temperature of all BNKT-BNdT ceramics was found to be 1125°C. X-ray diffraction pattern suggested that BNdT effectively diffused into BNKT lattice during sintering to form a solid solution with a perovskite structure. Scanning electron micrographs showed a slight reduction of grain size when BNdT was added. It was found that BNKT-0.10BNdT ceramic exhibited optimum electrical properties (ε r = 1716, tanδ = 0.0701, T c = 327°C, and d 33 = 211 pC/N), suggesting that this composition has a potential to be one of a promising lead-free piezoelectric candidate for dielectric and piezoelectric applications. © 2013 AIP Publishing LLC.