US4141738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Melt-formed polycrystalline ceramics and dopant hosts containing phosphorus
Assignee: OI Glass Inc
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Filing: 1978-03-16
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Granted: 1979-02-27
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Expires: 1998-03-16
Abstract
Abstract Disclosed are new polycrystalline ceramic bodies formed from melts containing as essential components P2O5, Ta2O3 and Al2O3 and sometimes containing small amounts of SiO2. Also disclosed are such bodies in the form of planar dopant hosts for doping silicon or germanium with phosphorus. Methods of making both products are disclosed as well as how to use the dopant hosts in a doping process.
Inventors
- 👤 James E. Rapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:01
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/16; C03C3/17; C03C10/00; C03C10/0009; H; H10; H10P; H10P32/00; H10P32/10; H10P32/19
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
126 words
A melt-formed polycrystalline ceramic body having an average linear coefficient of thermal expansion of less than 32 × 10 -7 /° C. over the range from zero to 300° C. and less than 42 × 10 -7 /° C. over the range from zero to 700° C., said ceramic body having a composition consisting essentially of ______________________________________
Oxide Mole Percent
______________________________________
P.sub.2 O.sub.5 45 - 75
Al.sub.2 O.sub.3 11 - 28
Ta.sub.2 O.sub.5 6.5 - 13
SiO.sub.2 0 - 20
La.sub.2 O.sub.3 0 - 7
______________________________________ where P 2 O 5 + Al 2 O 3 + Ta 2 O 5 is at least 75 mole percent of the composition and the mole ratio P 2 O 5 /Al 2 O 3 is at least 2.
Claim 2
Dependent Claim
126 words
A melt-formed polycrystalline ceramic body having an average linear coefficient of thermal expansion of less than 32 × 10 -7 /° C. over the range from zero to 300° C. and less than 42 × 10 -7 /° C. over the range from zero to 700° C., said ceramic body having a composition consisting essentially of ______________________________________
Oxide Mole Percent
______________________________________
P.sub.2 O.sub.5 45 - 75
Al.sub.2 O.sub.3 11 - 28
Ta.sub.2 O.sub.5 6.5 - 13
SiO.sub.2 0 - 20
La.sub.2 O.sub.3 0 - 7
______________________________________ where P 2 O 5 + Al 2 O 3 + Ta 2 O 5 is at least 75 mole percent of the composition and the mole ratio P 2 O 5 /Al 2 O 3 is at least 2.
Claim 3
Dependent Claim
20 words
A ceramic body of claim 1 wherein SiO 2 + La 2 O 3 is at least 2 mole percent.
Claim 4
Dependent Claim
140 words
A melt-formed polycrystalline ceramic body having an average linear coefficient of thermal expansion of less than 32 × 10 -7 /° C. over the range from zero to 300° C. and less than 42 × 10 -7 ° C. over the range from zero to 700° C., said ceramic body having a composition consisting essentially of ______________________________________
Oxide Mole Percent
______________________________________
P.sub.2 O.sub.5 57 - 75
Al.sub.2 O.sub.3 12 - 20
Ta.sub.2 O.sub.5 7.5 - 13
SiO.sub.2 0 - 13
La.sub.2 O.sub.3 0 - 6
______________________________________ where P 2 O 5 + Al 2 O 3 + Ta 2 O 5 is at least 86 mole percent and SiO 2 plus La 2 O 3 is at least 2 mole percent of the composition and the mole ratio P 2 O 5 /Al 2 O 3 is at least 2.
Claim 5
Dependent Claim
140 words
A melt-formed polycrystalline ceramic body having an average linear coefficient of thermal expansion of less than 32 × 10 -7 /° C. over the range from zero to 300° C. and less than 42 × 10 -7 ° C. over the range from zero to 700° C., said ceramic body having a composition consisting essentially of ______________________________________
Oxide Mole Percent
______________________________________
P.sub.2 O.sub.5 57 - 75
Al.sub.2 O.sub.3 12 - 20
Ta.sub.2 O.sub.5 7.5 - 13
SiO.sub.2 0 - 13
La.sub.2 O.sub.3 0 - 6
______________________________________ where P 2 O 5 + Al 2 O 3 + Ta 2 O 5 is at least 86 mole percent and SiO 2 plus La 2 O 3 is at least 2 mole percent of the composition and the mole ratio P 2 O 5 /Al 2 O 3 is at least 2.
Claim 6
Dependent Claim
12 words
A planar dopant host which is a ceramic body of claim 1.
Claim 7
Dependent Claim
12 words
A planar dopant host which is a ceramic body of claim 2.
Claim 8
Dependent Claim
12 words
A planar dopant host which is a ceramic body of claim 3.
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) | 1982-02-26 | 1982-08-28 | 1983-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-26 | 1986-08-28 | 1987-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-26 | 1990-08-28 | 1991-02-27 | $7700.00 | Window Closed / Lapsed |