公开(公告)号：US12137614B2

公开(公告)日：2024-11-05

申请号：US17430972

申请日：2020-02-10

Applicant: TDK CORPORATION

Inventor： Hiroki Katoh ,  Yumi Akiyama

IPC: H10N30/853 ,  C04B35/495 ,  H02N2/10 ,  H03H9/56 ,  H10N30/40 ,  H10N30/50

Abstract: A piezoelectric composition containing: at least one or more elements selected from alkali metal elements; at least one or more elements selected from a group consisting of vanadium, niobium, and tantalum; copper or copper and germanium; and oxygen. The piezoelectric composition has a main phase, and a high Cu-concentration phase in which a content ratio of copper is higher than the main phase, and when a content ratio of oxygen in the high Cu-concentration phase is set as Og, and a content ratio of copper is set as Cug, Og and Cug satisfy relationships of 51≤Og≤60 and 2.0≤Cug≤15.

公开(公告)号：US12096695B2

公开(公告)日：2024-09-17

申请号：US17213573

申请日：2021-03-26

Applicant: TDK CORPORATION

Inventor： Yuiko Hirose ,  Hiroki Katoh ,  Yumi Akiyama

IPC: H10N30/50 ,  H10N30/045 ,  H10N30/053 ,  H10N30/20 ,  H10N30/40 ,  H10N30/853 ,  H10N30/87

CPC classification number: H10N30/50 ,  H10N30/045 ,  H10N30/053 ,  H10N30/20 ,  H10N30/40 ,  H10N30/8542 ,  H10N30/8554 ,  H10N30/871 ,  H10N30/877

Abstract: Provided is a piezoelectric element according to the invention including a stacked body in which a piezoelectric layer and an internal electrode layer are stacked. In addition, the internal electrode layer contains at least one kind of element selected from palladium, nickel, platinum, gold, and silver, and copper, and the content of copper contained in the internal electrode layer is 1 to 50 at % in terms of a copper element.