# US 8,786,167 B2 · Ceramic material, method for the production of the ceramic material and component comprising the ceramic material

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- Number: US 8,786,167 B2
- Document ID: US8786167B2
- Status: Granted
- Kind: B2
- Application number: 12/990,393
- Filed: 2009-04-30
- Published: 2011-12-01
- Granted: 2014-07-22
- Earliest claimed: 2008-04-30
- Assignees: Epcos AG
- Applicants: Alain Brice Kounga Njiwa; Shan-Tao Zhang; Juergen Roedel; Wook Jo; Torsten Granzow
- Inventors: Alain Brice Kounga Njiwa; Shan-Tao Zhang; Juergen Roedel; Wook Jo; Torsten Granzow
- Web page: https://patentgrep.com/patent/US8786167B2

## CPC

- C04B 35/475: based on bismuth titanates
- C04B 35/462: based on titanates
- C04B 35/62675: {characterised by the treatment temperature}
- H10N 30/853: Ceramic compositions
- C04B 2235/3201: Alkali metal oxides or oxide-forming salts thereof
- C04B 2235/3255: Niobates or tantalates, e.g. silver niobate
- C04B 2235/3298: Bismuth oxides, bismuthates or oxide forming salts thereof, e.g. zinc bismuthate
- C04B 2235/656: characterised by specific heating conditions during heat treatment
- C04B 2235/72: Products characterised by the absence or the low content of specific components, e.g. alkali metal free alumina ceramics
- C04B 2235/76: Crystal structural characteristics, e.g. symmetry
- C04B 2235/765: Tetragonal symmetry
- C04B 2235/77: Density
- 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 2235/81: Materials characterised by the absence of phases other than the main phase, i.e. single phase materials
- H10N 30/50: having a stacked or multilayer structure
- 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
- H10N: ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR

## Abstract

The invention relates to a ceramic binary material and to a method for the production thereof. The material has piezoelectric properties and has a composition of the formula (1−x)(Bi0.5Na0.5TiO3)×(K0.5Na0.5NbO3), where 0<x≦0.15. Furthermore, the invention relates to a component comprising said material.

## Claims

### Claim 1

A ceramic material having the composition (1−x)(Bi0.5Na0.5TiO3)×(K0.5Na0.5NbO3), wherein 0<x≦0.15, wherein the ceramic material is binary.

### Claim 2 (depends on 1)

The material according to claim 1, wherein x is in the range of 0.08≦x≦0.12.

### Claim 3 (depends on 1)

The material according to claim 1, wherein said material is lead-free.

### Claim 4 (depends on 1)

The material according to claim 1, wherein x is in the range of 0.06≦x≦0.075, and the material has a morphotropic phase boundary.

### Claim 5 (depends on 1)

The material according to claim 1, wherein x=0.12.

### Claim 6 (depends on 1)

The material according to claim 1, wherein x=0.11.

### Claim 7 (depends on 1)

A component having at least one ceramic base body and at least two electrodes arranged on the base body, wherein the base body has a material as claimed in claim 1.

### Claim 8 (depends on 7)

The component according to claim 7, wherein the base body comprises a multiplicity of stacked ceramic layers with electrodes arranged therebetween, wherein the electrodes lead out from the stacked ceramic layers and are contacted via external electrodes.

### Claim 9 (depends on 7)

The use of the component according to claim 7 as a piezo actuator.

### Claim 10

A method for the production of a material comprising a ceramic material having the composition (1−x)(Bi0.5Na0.5TiO3)×(K0.5Na0.5NbO3), wherein 0<x≦0.15, comprising the following steps of:
A) mixing powdery oxygen-containing compounds of Bi, Na, K, Ti and Nb in a stoichiometric ratio to produce a starting mixture,
B) grounding and calcining the starting mixture to produce a powdery solid solution,
C) pressing and sintering the powdery solid solution;
wherein the ceramic material is binary.

### Claim 11 (depends on 10)

The method according to claim 10, wherein, in method step A), the powdery oxygen-containing compounds are selected from a group comprising oxides and carbonates of Bi, Na, K, Ti and Nb.

### Claim 12 (depends on 10)

The method according to claim 10, wherein, in method step B), the starting mixture is ground in a solvent, dried and calcined at a temperature in the range of 800° C. to 950° C.

### Claim 13 (depends on 10)

The method according to claim 10, wherein, in method step C), the ground powdery solid solution is pressed to form disks and sintered at a temperature in the range of 1050° C. to 1150° C.