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US3790405A
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Controlled epitaxial growth from supercooled nutrient-flux solution
Assignee: AT&T Inc
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Filing: 1971-07-16
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Granted: 1974-02-05
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Expires: 1991-07-16
Abstract
Abstract Controlled growth of epitaxial layers of a variety of structures including garnet, spinel, and corundum are grown out of supercooled nutrient-flux solutions. Controlled growth, both of composition and physical characteristics, is attributed to the conditions that make the procedure primarily diffusion (rather than atomic kinetic) controlled. Such conditions include high dilution of nutrient and high viscosity of the solution.
Inventors
- 👤 H Levinstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:39
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2675; C30; C30B; C30B19/00; C30B19/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
25 words
Method of claim 1 in which the said epitaxial growth is homoepitaxial and in which the said first composition and second composition are substantially identical.
Claim 2
Dependent Claim
23 words
Method of claim 1 in which the said epitaxial growth is heteroepitaxial and in which the saiD first composition and second composition differ.
Claim 3
Dependent Claim
18 words
Method of claim 3 in which the lattice parameters are matched within + or - 0.5 per cent.
Claim 4
Dependent Claim
34 words
Method of claim 1 in which growth is on a substrate a major face of which defines a plane corresponding with a natural facet evidenced in a bulk-grown crystal of the said first composition.
Claim 5
Dependent Claim
26 words
Method of claim 1 in which the degree of supercooling is a minimum of at least 20*C during at least a portion of the growth period.
Claim 6
Dependent Claim
14 words
Method of claim 1 in which the said first composition is an oxidic material.
Claim 7
Dependent Claim
15 words
Method of claim 7 in which the flux independent of nutrient ingredients comprises lead oxide.
Claim 8
Dependent Claim
47 words
Method of claim 8 in which such flux consists essentially of a mixture of lead oxide and boron oxide, the relative amounts of such flux constituents being indicated by the formula (PbO)x (B203)y where x is from 0.9 to 0.6 and y is from 0.1 to 0.4.
Claim 9
Dependent Claim
36 words
Method of claim 7 in which the flux independent of nutrient ingredients consists essentially of a mixture represented by the formula (Bi203)a(V205)b where a is from 0.9 to 0.65 and b is from 0.1 to 0.35.
Claim 10
Dependent Claim
24 words
Method of claim 7 in which the oxidic material evidences a structure selected from a group consisting of garnet, spinel, ferrite, orthoferrite, and corundum.
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |