# US 4,392,970 A · Piezoelectric ceramics

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- Number: US 4,392,970 A
- Document ID: US4392970A
- Status: Granted
- Kind: A
- Application number: 06/345,530
- Filed: 1982-02-03
- Granted: 1983-07-12
- Earliest claimed: 1973-09-04
- Assignees: Matsushita Electric Industrial Co., Ltd.
- Inventors: Hiromu Ouchi; Masamitsu Nishida; Kazunori Numata
- Web page: https://patentgrep.com/patent/US4392970A

## CPC

- H01G 7/026: {with ceramic dielectric}
- C04B 35/46: based on titanium oxides or titanates (containing also zirconium or hafnium oxides, zirconates or hafnates C04B35/49)
- C04B 35/48: based on zirconium or hafnium oxides, zirconates, {zircon} or hafnates
- C04B 35/50: based on rare-earth compounds {(non-oxide rare earth compounds C04B35/5156)}
- C04B 35/51: based on compounds of actinides ({non-oxide actinide compounds C04B35/5158;} nuclear fuel materials G21C3/62)
- H10N 30/8554: {Lead-zirconium titanate [PZT] based}
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)
- 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

Ceramic materials within particular ranges of the ternary system Pb(Sn.sub.1/3 Sb.sub.2/3) O.sub.3 -PbTiO.sub.3 -PbZrO.sub.3 in solid solution form exhibit high planar coupling coefficient along with high dielectric constant, and are useful in electromechanical transducers. The ceramic materials are those within the area A, B, C, D, E and F of FIG. 2.

## Claims

### Claim 1

A piezoelectric ceramic composition exhibiting high stability of resonant frequency with respect to temperature over the range of -40.degree. C. to 80.degree. C. comprising a solid solution of a material selected from the area bound by lines connecting points A, B, C, D, E and F of the triangular diagram of FIG. 2, wherein A, B, C, D, E and F respectively have the following formulae:
A: Pb(Sn.sub.1/3 Sb.sub.2/3).sub.0.01 Ti.sub.0.75 Zr.sub.0.24 O.sub.3
B: Pb(Sn.sub.1/3 Sb.sub.2/3).sub.0.01 Ti.sub.0.09 Zr.sub.0.90 O.sub.3
C: Pb(Sn.sub.1/3 Sb.sub.2/3).sub.0.09 Ti.sub.0.01 Zr.sub.0.90 O.sub.3
D: Pb(Sn.sub.1/3 Sb.sub.2/3).sub.0.50 Ti.sub.0.01 Zr.sub.0.49 O.sub.3
E: Pb(Sn.sub.1/3 Sb.sub.2/3).sub.0.50 Ti.sub.0.495 Zr.sub.0.005 O.sub.3
F: Pb(Sn.sub.1/3 Sb.sub.2/3).sub.0.25 Ti.sub.0.745 Zr.sub.0.005 O.sub.3 .

### Claim 2 (depends on 1)

The piezoelectric ceramic composition of claim 1 comprising a solid solution of a material selected from the area bound by lines connecting points G, H, I, J, K and L of the triangular diagram of FIG. 2, wherein G, H, I, J, K and L respectively have the following formulae:
G: Pb(Sn.sub.1/3 Sb.sub.2/3).sub.0.30 Ti.sub.0.33 Zr.sub.0.37 O.sub.3
H: Pb(Sn.sub.1/3 Sb.sub.2/3).sub.0.20 Ti.sub.0.48 Zr.sub.0.32 O.sub.3
I: Pb(Sn.sub.1/3 Sb.sub.2/3).sub.0.05 Ti.sub.0.55 Zr.sub.0.40 O.sub.3
J: Pb(Sn.sub.1/3 Sb.sub.2/3).sub.0.01 Ti.sub.0.47 Zr.sub.0.52 O.sub.3
K: Pb(Sn.sub.1/3 Sb.sub.2/3).sub.0.05 Ti.sub.0.43 Zr.sub.0.52 O.sub.3
L: Pb(Sn.sub.1/3 Sb.sub.2/3).sub.0.20 Ti.sub.0.33 Zr.sub.0.47 O.sub.3.

### Claim 3 (depends on 1)

The electromechanical transducer element comprising a piezoelectric ceramic composition as claimed in claim 1.

### Claim 4 (depends on 2)

The electromechanical transducer element comprising a piezoelectric ceramic composition as claimed in claim 2.

### Claim 5

A piezoelectric ceramic material exhibiting high stability of resonant frequency with respect to temperature over the range of -40.degree. C. to 80.degree. C. consisting of the solid solution having one of the following formulae:
Pb(Sn.sub.1/3 Sb.sub.2/3).sub.0.05 Ti.sub.0.44 Zr.sub.0.51 O.sub.3
or
Pb(Sn.sub.1/3 Sb.sub.2/3).sub.0.15 Ti.sub.0.44 Zr.sub.0.41 O.sub.3 .

### Claim 6 (depends on 5)

The piezoelectric ceramic material of claim 5 having the formula:
Pb(Sn.sub.1/3 Sb.sub.2/3).sub.0.15 Ti.sub.0.44 Zr.sub.0.41 O.sub.3
having a change in resonant frequency with respect to temperature of 0.2% within the range of -40.degree. C. to 80.degree. C.