公开(公告)号：US11005028B2

公开(公告)日：2021-05-11

申请号：US16357864

申请日：2019-03-19

Applicant: TDK CORPORATION

Inventor： Hiroki Katoh ,  Yuiko Hirose ,  Masakazu Hirose ,  Mirai Ishida

IPC: H01L41/187 ,  H01L41/43 ,  C04B35/495 ,  C04B35/63

Abstract: A piezoelectric composition including copper, germanium and a complex oxide represented by a compositional formula KmNbO3 and having a perovskite structure, in which m in the compositional formula satisfies 0.970≤m≤0.999, and with respect to 1 mol of the complex oxide, x mol % of copper in terms of a copper element and y mol % of germanium in terms of a germanium element are contained, wherein x satisfies 0.100≤x≤1.000 and y satisfies 0.000