US4295988A
Expired / Lapsed
US
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Magneto-optic Bi1 Lu2 Fe5 O12 crystals
Assignee: Unisys Corp
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Filing: 1979-07-18
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Granted: 1981-10-20
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Expires: 1999-07-18
Abstract
Abstract A mixtureand method are disclosed for growing bismuth lutetium iron garnet crystals via liquid phase epitaxy on a gadolinium gallium garnet (GGG) substrate wherein the crystals exhibit a relatively high Faraday rotation and an improved optical absorption.
Inventors
- 👤 Gary L. Nelson
- 👤 William A. Harvey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:20
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/0009; G02F1/0036; C; C01; C01G; C01G49/00; C01G49/009; C30; C30B; C30B19/00; C30B19/02; C30B29/00; C30B29/10; C30B29/16; C30B29/22; C30B29/28; C01P; C01P2002/00; C01P2002/30; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
96 words
A mixture for growing a Bi 1 Lu 2 Fe 5 O 12 garnet crystal on a Gd 3 Ga 5 O 12 garnet substrate in a liquid phase eptiaxial process, said mixture consisting essentially of PbO, Bi 2 O 3 , Fe 2 O 3 , Lu 2 O 3 and CaO in concentrations sufficient to grow said Bi 1 Lu 2 Fe 5 O 12 garnet crystal and the latter CaO in a concentration such that the molar ratio of CaO to Lu 2 O 3 is in the range of 0.05 to 0.40.
Claim 2
Dependent Claim
96 words
A mixture for growing a Bi 1 Lu 2 Fe 5 O 12 garnet crystal on a Gd 3 Ga 5 O 12 garnet substrate in a liquid phase eptiaxial process, said mixture consisting essentially of PbO, Bi 2 O 3 , Fe 2 O 3 , Lu 2 O 3 and CaO in concentrations sufficient to grow said Bi 1 Lu 2 Fe 5 O 12 garnet crystal and the latter CaO in a concentration such that the molar ratio of CaO to Lu 2 O 3 is in the range of 0.05 to 0.40.
Claim 3
Dependent Claim
92 words
A mixture for growing a Bi 1 Lu 2 Fe 5 O 12 garnet crystal on a Gd 3 Ga 5 O 12 garnet substrate in a liquid phase epitaxial process at a growth temperature between 680° to 800° C., said mixture consisting essentially of PbO, Bi 2 O 3 , Fe 2 O 3 , Lu 2 O 3 and CaO in the relative molar ratio ranges of ______________________________________
##STR5## between .20 to .40,
##STR6## between .07 to .13,
##STR7## between .030 to .080 and
##STR8## between .05 to .40.
______________________________________
Claim 4
Dependent Claim
92 words
A mixture for growing a Bi 1 Lu 2 Fe 5 O 12 garnet crystal on a Gd 3 Ga 5 O 12 garnet substrate in a liquid phase epitaxial process at a growth temperature between 680° to 800° C., said mixture consisting essentially of PbO, Bi 2 O 3 , Fe 2 O 3 , Lu 2 O 3 and CaO in the relative molar ratio ranges of ______________________________________
##STR5## between .20 to .40,
##STR6## between .07 to .13,
##STR7## between .030 to .080 and
##STR8## between .05 to .40.
______________________________________
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-19 | 1985-04-20 | 1985-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-19 | 1989-04-20 | 1989-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-19 | 1993-04-20 | 1993-10-20 | $7700.00 | Window Closed / Lapsed |