Piezoelectric composition and piezoelectric element

Patent metadata

Field	Value
Publication number	US-11271147-B2
Application number	US-201917040310-A
Country	US
Kind code	B2
Filing date	Mar 19, 2019
Priority date	Mar 23, 2018
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

A piezoelectric composition containing: a complex oxide having a perovskite structure represented by a general formula of ABO 3 ; copper; and one or more elements selected from the group consisting of chromium, nickel and zinc, in which in ABO 3 , 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 CrO 3/2 , NiO, ZnO, α satisfies a relationship of 0.2≤α≤2.5, and β satisfies a relationship of 0.2≤β≤2.0.

First claim

What is claimed is:

1. A piezoelectric composition comprising:
a complex oxide having a perovskite structure represented by a general formula of ABO 3 ;
copper; and
one or more elements selected from the group consisting of chromium, nickel and zinc,
wherein in ABO 3 , 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 the one or more elements selected from the group consisting of chromium, nickel and zinc is β mol % in terms of CrO 3/2 , NiO, ZnO,
α satisfies a relationship of 0.2≤α≤2.5, and
β satisfies a relationship of 0.2≤β≤2.0.

2. The piezoelectric composition according to claim 1 , wherein ABO 3 is represented by a composition formula of K x (Nb 1-y Ta y )O 3 ,
x in the compositional formula satisfies a relationship of 0.980≤x≤0.999, and
y in the composition formula satisfies a relationship of 0≤y≤0.100.

3. The piezoelectric composition according to claim 2 , wherein ABO 3 is represented by the composition formula of K x (Nb 1-y Ta y )O 3 , and y in the composition formula satisfies a relationship of 0<y≤0.100.

4. A piezoelectric element comprising:
the piezoelectric composition according to claim 1 .

Assignees

• Tdk Corp

Inventors

• Hirose Masakazu
• Hirose Yuiko
• Katoh Hiroki
• Sasaki Tamotsu
• Umeda Yuji

Classifications

• C04B2235/768

  Perovskite structure ABO3 · CPC title

• C04B2235/3281

  Copper oxides, cuprates or oxide-forming salts thereof, e.g. CuO or Cu2O · CPC title

• C04B2235/3241

  Chromium oxides, chromates, or oxide-forming salts thereof · CPC title

• C04B35/638 Primary

  Removal thereof · CPC title

• C04B2235/3251

  Niobium oxides, niobates, tantalum oxides, tantalates, or oxide-forming salts thereof · CPC title