Reduced leakage current and enhanced piezoelectricity of BNT–BT–BMO thin films

BiMeO 3 (where Me denotes a transition metal) is often used as a chemical modifier to form the Bi 0.5 Na 0.5 TiO 3 ‐based solid solutions and to improve the electromechanical properties of the materials. In this study, BiMnO 3 was selected as a chemical modifier, and (1 −  x )(0.94Bi 0.5 Na 0.5 TiO 3 ‐0.06BaTiO 3 )– x BiMnO 3 thin films with x  = 0, 0.005, 0.01, and 0.015 were fabricated using the metal organic decomposition method to study the contributions of the third end‐member BiMnO 3 to the reduction in the leakage current and the enhancement of the piezoelectric properties of Bi 0.5 Na 0.5 TiO 3 ‐BaTiO 3 thin films. Thin films with 1 mol% BiMnO 3 exhibit a lower leakage current, and a better piezoelectricity and ferroelectricity, whose S max / E max , P max , 2 E c , and ε r are 100.4 pm/V, 48.0 μC/cm 2 , 54.9 kV/cm, and 942, respectively.