公开(公告)号：US11659769B2

公开(公告)日：2023-05-23

申请号：US16497052

申请日：2018-03-20

Applicant: TDK CORPORATION

Inventor： Masakazu Hirose ,  Yuiko Hirose ,  Hiroki Katoh

IPC: H01L41/187

CPC classification number: H10N30/8542 ,  H10N30/072 ,  H10N30/50 ,  H10N30/097

Abstract: A piezoelectric composition including manganese and a complex oxide having a perovskite structure represented by a general formula ABO3, wherein an A site element in the ABO3 is potassium or potassium and sodium, a B site element in the ABO3 is niobium, a concentration distribution of the manganese has a variation, and the variation shows a CV value of 35% or more and 440% or less.

公开(公告)号：US11271147B2

公开(公告)日：2022-03-08

申请号：US17040310

申请日：2019-03-19

Applicant: TDK CORPORATION

Inventor： Masakazu Hirose ,  Yuiko Hirose ,  Hiroki Katoh ,  Tamotsu Sasaki ,  Yuji Umeda

IPC: H01L41/187 ,  C04B35/495

Abstract: A piezoelectric composition containing: a complex oxide having a perovskite structure represented by a general formula of ABO3; copper; and one or more elements selected from the group consisting of chromium, nickel and zinc, in which in ABO3, an A-site element is potassium and a B-site element is niobium, or niobium and tantalum, with respect to 1 mol of the complex oxide, a content ratio of the copper is α mol % in terms of CuO, a content ratio of one or more elements selected from the group consisting of chromium, nickel and zinc is β mol % in terms of CrO3/2, NiO, ZnO, α satisfies a relationship of 0.2≤α≤2.5, and β satisfies a relationship of 0.2≤β≤2.0.

公开(公告)号：US11239410B2

公开(公告)日：2022-02-01

申请号：US16497090

申请日：2018-03-20

Applicant: TDK CORPORATION

Inventor： Hiroki Katoh ,  Yuiko Hirose ,  Masakazu Hirose

IPC: H01L41/187 ,  C04B35/495 ,  H01L41/083

Abstract: A piezoelectric composition including copper and a complex oxide having a perovskite structure represented by a general formula ABO3, in which an A site element in the ABO3 is potassium or potassium and sodium, a B site element in the ABO3 is niobium or niobium and tantalum, the copper is included in n mol % in terms of a copper element with respect to 1 mol of the complex oxide, and n satisfies 0.100≤n≤1.000.

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.

公开(公告)号：US09831418B2

公开(公告)日：2017-11-28

申请号：US14610321

申请日：2015-01-30

Applicant: TDK CORPORATION

Inventor： Taku Masai ,  Masahito Furukawa ,  Hiroki Katoh

IPC: H01L41/187 ,  H01L41/18 ,  H01L41/08 ,  H01L41/083 ,  H01L41/316

CPC classification number: H01L41/1878 ,  C04B35/475 ,  C04B2235/3201 ,  C04B2235/3206 ,  C04B2235/3241 ,  C04B2235/3262 ,  C04B2235/327 ,  H01L41/0805 ,  H01L41/083 ,  H01L41/18 ,  H01L41/316

Abstract: The present invention aims to provide a piezoelectric composition and a piezoelectric element. In the piezoelectric composition, the main component is represented by the following formula with a perovskite type structure, (Bi(0.5x+y+z)Na0.5x)m(Ti(x+0.5y)Mg0.5yMez)O3 wherein, 0.05≦x≦0.7, 0.01≦y≦0.7, 0.01≦z≦0.6, 0.75≦m≦1.0, x+y+z=1 and the transition metal element Me is any one or more selected from the group consisting of Mn, Cr, Fe and Co.

公开(公告)号：US11195986B2

公开(公告)日：2021-12-07

申请号：US16496987

申请日：2018-03-20

Applicant: TDK CORPORATION

Inventor： Yuiko Hirose ,  Hiroki Katoh ,  Masakazu Hirose

IPC: H01L41/187 ,  C04B35/495

Abstract: A piezoelectric composition having a complex oxide including potassium and niobium, in which the complex oxide has a first phase represented by a compositional formula KNbO3, and one or two phases selected from a second phase represented by a compositional formula K4Nb6O17 and a third phase represented by a compositional formula KNb3O8.

公开(公告)号：US09905749B2

公开(公告)日：2018-02-27

申请号：US14832309

申请日：2015-08-21

Applicant: TDK CORPORATION

Inventor： Hiroki Katoh

IPC: H01L41/18 ,  H01L41/187 ,  H01L41/083

CPC classification number: H01L41/18 ,  H01L41/083 ,  H01L41/187

Abstract: The present invention aims to provide a piezoelectric composition which is free of lead based compounds and is represented by the following formula (1), (Bi0.5xNa0.5xBa0.7y+zCa0.3y)a(Tix+y+0.8zHf0.2z)O3 (1), wherein, x, y, z and a in formula (1) meets the following conditions, 0.70x0.90, 0.02y0.28, 0.02z0.28, 0.90a1.10 and x+y+z=1. The present invention also provides a piezoelectric device having the piezoelectric composition mentioned above.

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