Electromechanical transducer, liquid discharge head, liquid discharge apparatus, and method for manufacturing electromechanical transducer

Abstract

An electromechanical transducer includes an electromechanical transducer film of laminated layers including a perovskite-type complex oxide represented by a general formula of ABO; and a pair of electrodes opposed to each other with the electromechanical transducer film interposed between the pair of electrodes. In the general formula of ABO, A includes Pb and B includes Zr and Ti. A variable ratio ΔPb of Pb, determined by Pb(max)−Pb(min), is 6% or less and a variable ratio ΔZr of Zr, determined by Zr(max)−Zr(min), is 9% or less, where an atomic weight ratio of Pb in the electromechanical transducer film is denoted by Pb/B, an atomic weight ratio of Zr in the electromechanical transducer film is denoted by Zr/B, a maximum value and a minimum value of the atomic weight ratio of Pb in a film thickness direction of the electromechanical transducer film are denoted by Pb(max) and Pb(min), respectively, and a maximum value and a minimum value of the atomic weight ratio of Zr in the film thickness direction of the electromechanical transducer film are denoted by Zr(max) and Zr(min), respectively.