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US5093291A
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Pyroelectric ceramic composite structure
Assignee: Mitsubishi Mining and Cement Co Ltd
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Filing: 1990-09-11
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Granted: 1992-03-03
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Expires: 2010-09-11
Abstract
Abstract A pyroelectric ceramic composition structure composed of ceramic agglomerations assembled from a plurality of pyroelectric ceramic compositions to form a structure with a high pyroelectric constant, and a second transition temperature below its curie temperature. The composition is made up of a compound of the formula: PbZr.sub.x (Zn.sub.1/3 Nb.sub.2/3).sub.y Ti.sub.z O.sub.3 wherein X+Y+Z=1, X=0.72-0.95; Y=0.1-Z and 0<Z≦0.1 an additive and a glass phase which acts to sinter together the agglomerates.
Inventors
- 👤 Akira Kawabata
- 👤 Tadashi Shiozaki
- 👤 Masatoshi Adachi
- 👤 Seiji Yamanaka
- 👤 Tamotsu Ueyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:55
CPC Classifications
G; G01; G01K; G01K7/00; G01K7/003; C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/49; C04B35/491; H; H10; H10N; H10N15/00; H10N15/10; H10N15/15
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
71 words
A pyroelectric ceramic structure comprising a plurality of fired agglomerations having differing compositions and wherein said compositions are selected from the range of a composition having a formula of: PbZr.sub.x (Zn.sub.1/3 Nb.sub.2/3).sub.y Ti.sub.Z O.sub.3 wherein x+y+z=1, x=0.90, y=0.1-z, and 0<Z≦0.1 an additive selected from the group consisting of manganese oxide, lanthanum oxide and mixtures thereof; and a glass phase, whereby said glass phase acts to sinter together said plurality of agglomerations.
Claim 2
Dependent Claim
71 words
A pyroelectric ceramic structure comprising a plurality of fired agglomerations having differing compositions and wherein said compositions are selected from the range of a composition having a formula of: PbZr.sub.x (Zn.sub.1/3 Nb.sub.2/3).sub.y Ti.sub.Z O.sub.3 wherein x+y+z=1, x=0.90, y=0.1-z, and 0<Z≦0.1 an additive selected from the group consisting of manganese oxide, lanthanum oxide and mixtures thereof; and a glass phase, whereby said glass phase acts to sinter together said plurality of agglomerations.
Claim 3
Dependent Claim
28 words
A pyroelectric ceramic structure in accordance with claim 1 wherein said additive is present in an amount less than or equal to 2 mole percent of said composition.
Claim 4
Dependent Claim
16 words
A pyroelectric ceramic structure as claimed in claim 1 wherein said glass phase is lead germanate.
Claim 5
Dependent Claim
32 words
A pyroelectric ceramic structure as claimed in claim 1 wherein said glass phase is present in an amount of 0.05 to 40 percent by weight of the total weight of the composition.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-03-03 | 1995-09-02 | 1996-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-03 | 1999-09-02 | 2000-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-03 | 2003-09-02 | 2004-03-03 | $7700.00 | Window Closed / Lapsed |