US4087366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing a piezoelectric ceramic composition
Assignee: TDK ELECTRONIC Co
•
Filing: 1973-11-30
•
Granted: 1978-05-02
•
Expires: 1993-11-30
Abstract
Abstract A piezoelectric ceramic composition which comprises the combination of a pyrochlore composite oxide and a base ceramic mixture of PbTiO 3 and PbZrO 3 is prepared by individually forming pyrochlore composite oxide, PbTiO 3 and PbZrO 3 components; and sintering a mixture of the formed components at a temperature greater than 1,000° C.
Inventors
- 👤 Yoichi Tanaka
- 👤 Masamichi Tsuruta
- 👤 Koji Takahashi
- 👤 Tsutomu Hasegawa
- 👤 Makoto Hori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:19
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/49; C04B35/491; H; H10; H10N; H10N30/00; H10N30/80; H10N30/85; H10N30/853
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
176 words
A method for preparing a piezoelectric ceramic composition of the formula ##STR1## wherein said pyrochlore composite oxide is selected from the group consisting of Cd 2 Sb 2 O 7 , Cd 2 Nb 2 O 7 , Pb 2 Sb 2 O 7 , Pb 2 Nb 2 O 7 , Sr 2 Sb 2 O 7 , Sr 2 Nb 2 O 7 , Ba 2 Sb 2 O 7 and Ba 2 Nb 2 O 7 ; 0.2 ≦ y ≦ 0.8; 0.2 ≦ z ≦ 0.8; y+z = 1.0 and 0.001 ≦ x ≦ 0.2, and containing 0.01 to 3.0 wt% Mn as MnO 2 comprising: individually forming lead titanate, lead zirconate and pyrochlore composite oxide components; mixing said components with MnO 2 in an amount equivalent to 0.01 to 3.0 wt% Mn to provide a mixture in which said lead titanate, lead zirconate and pyrochlore composite oxide are present in amounts that satisfy said formula; and sintering said mixture at a temperature greater than 1000° C to form said piezoelectric composition.
Claim 2
Independent Claim
176 words
A method for preparing a piezoelectric ceramic composition of the formula ##STR1## wherein said pyrochlore composite oxide is selected from the group consisting of Cd 2 Sb 2 O 7 , Cd 2 Nb 2 O 7 , Pb 2 Sb 2 O 7 , Pb 2 Nb 2 O 7 , Sr 2 Sb 2 O 7 , Sr 2 Nb 2 O 7 , Ba 2 Sb 2 O 7 and Ba 2 Nb 2 O 7 ; 0.2 ≦ y ≦ 0.8; 0.2 ≦ z ≦ 0.8; y+z = 1.0 and 0.001 ≦ x ≦ 0.2, and containing 0.01 to 3.0 wt% Mn as MnO 2 comprising: individually forming lead titanate, lead zirconate and pyrochlore composite oxide components; mixing said components with MnO 2 in an amount equivalent to 0.01 to 3.0 wt% Mn to provide a mixture in which said lead titanate, lead zirconate and pyrochlore composite oxide are present in amounts that satisfy said formula; and sintering said mixture at a temperature greater than 1000° C to form said piezoelectric composition.
Claim 3
Dependent Claim
19 words
The process of claim 1, which further comprises: calcining said mixed components prior to the sintering of said mixture.
References Cited (Backward Citations)
GB1052870A
Cited
US3194765A
Cited
US3344073A
Cited
US3518199A
Cited
US3669887A
Cited
US3649540A
Cited
US3661781A
Cited
US3671765A
Cited
DE2001290A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-01 | 1981-10-31 | 1982-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-01 | 1985-10-31 | 1986-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-01 | 1989-10-31 | 1990-05-02 | $7700.00 | Window Closed / Lapsed |