# US 9,437,807 B2 · Piezoelectric composition and piezoelectric element

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- Number: US 9,437,807 B2
- Document ID: US9437807B2
- Status: Granted
- Kind: B2
- Application number: 14/674,466
- Filed: 2015-03-31
- Published: 2015-10-01
- Granted: 2016-09-06
- Earliest claimed: 2014-03-31
- Assignees: TDK Corporation
- Applicants: TDK Corporation
- Inventors: Yuko Saya; Taku Masai; Masahito Furukawa; Masamitsu Haemori
- Web page: https://patentgrep.com/patent/US9437807B2

## CPC

- H10N 30/8561: {Bismuth-based oxides}
- B32B 18/00: Layered products essentially comprising ceramics, e.g. refractory products
- C04B 35/475: based on bismuth titanates
- C04B 35/6261: {Milling}
- C04B 35/62655: {Drying, e.g. freeze-drying, spray-drying, microwave or supercritical drying}
- C04B 35/62675: {characterised by the treatment temperature}
- C04B 35/638: Removal thereof
- C23C 14/08: Oxides (C23C14/10 takes precedence)
- C04B 2235/3201: Alkali metal oxides or oxide-forming salts thereof
- C04B 2235/3206: Magnesium oxides or oxide-forming salts thereof
- C04B 2235/3217: Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B 2235/3232: Titanium oxides or titanates, e.g. rutile or anatase
- C04B 2235/3272: Iron oxides or oxide forming salts thereof, e.g. hematite, magnetite
- C04B 2235/3298: Bismuth oxides, bismuthates or oxide forming salts thereof, e.g. zinc bismuthate
- C04B 2235/442: Carbonates
- C04B 2235/449: Organic acids, e.g. EDTA, citrate, acetate, oxalate
- C04B 2235/6562: Heating rate
- C04B 2235/6565: Cooling rate
- C04B 2235/768: Perovskite structure ABO3
- C04B 2235/785: Submicron sized grains, i.e. from 0,1 to 1 micron
- C04B 2235/786: Micrometer sized grains, i.e. from 1 to 100 micron
- C04B 2237/346: Titania or titanates
- C04B 2237/68: Forming laminates or joining articles wherein at least one substrate contains at least two different parts of macro-size, e.g. one ceramic substrate layer containing an embedded conductor or electrode
- C04B 2237/704: of one or more of the ceramic layers or articles
- H10N 30/50: having a stacked or multilayer structure
- H10N 30/704: {based on piezoelectric or electrostrictive films or coatings}
- H10N: ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)

## Abstract

The present invention aims to provide a piezoelectric composition and a piezoelectric element containing the piezoelectric composition. In the piezoelectric composition, the main component contains a substance represented by the following formula with a perovskite structure, (Bi(0.5x+y+z)Na0.5x)m(Ti(x+0.5y)Mg0.5yAlkzCo(1−k)z)O3 0.15≦x≦0.7, 0.28≦y≦0.75, 0.02≦z≦0.30, 0.17≦k≦0.83, 0.75≦m≦1.0, and x+y+z=1.

## Claims

### Claim 1

A piezoelectric composition comprising a main component which contains a substance represented by the following formula with a perovskite structure,
(Bi(0.5x+y+z)Na0.5x)m(Tix+0.5yMg0.5yAlkzCo(1−k)z)O3
wherein, 0.15≦x≦0.7, 0.28≦y≦0.75, 0.02≦z≦0.30, 0.17≦k≦0.83, 0.75≦m≦1.0, and x+y+z=1.

### Claim 2 (depends on 1)

A piezoelectric element comprising said piezoelectric composition of claim 1 and electrodes for applying a voltage.