Large piezoresponse of lead-free Bi 0.5(Na 0.85K 0.15) 0.5TiO 3 thin film

Abstract

0.85Bi 0.5Na 0.5TiO 3-0.15Bi 0.5K 0.5TiO 3 (BNKT15) lead-free thin films were prepared on Pt(111)/TiO 2/SiO 2/Si(100) substrates by the chemical solution deposition method. BNKT15 are MPB composition in the Bi 0.5Na 0.5TiO 3-Bi 0.5K 0.5TiO 3 (BNT-BKT) system. The maximum piezoelectric coefficient (d 33,f) value of BNKT15 thin film is approximately 75 pm/V, which is comparable to that of polycrystalline PZT thin films. These results suggest that BNKT15 thin film can be used as an alternative for PZT films in piezoelectric micro-electromechanical systems. © 2011 Elsevier B.V. All rights reserved.