US4485094A
Expired / Lapsed
US
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Method of making ABO3 of the cubic perovskite structure
Assignee: Westinghouse Electric Corp
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Filing: 1983-01-28
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Granted: 1984-11-27
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Expires: 2003-01-28
Abstract
Abstract Disclosed is a method of making a continuous mixed oxide thin film. A composition is prepared of an alkoxide source of one of the metals in the mixed oxide, a chelate source of a second metal in the mixed oxide, sufficient alcohol to solubilize sources of all metals in said mixed oxide and about 1 to about 2 moles of water per mole of mixed oxide. The composition is applied to a substrate and the coating on the substrate is heated to at least about 500° C. to evaporate the solvent and produce the mixed oxide film on the substrate.
Inventors
- 👤 Alfred R. Pebler
- 👤 Robert G. Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:42
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/02; C23C18/12; C23C18/1204; C23C18/1208; C23C18/1216; C23C18/125; C23C18/1275
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
112 words
A method of making a continuous film of mixed oxide of at least two metals comprising: (A) preparing a solution which comprises: (1) an alkoxide source of one of said metals; (2) a chelate source of a second of said metals; and (3) sufficient solvent to solubilize the sources of said metals in said mixed oxide; (B) adding to said solution about 1 to about 2 moles of water per mole of said mixed oxide; (C) applying said solution to the surface of a substrate to form a coating on said substrate; and (D) heating said solution to at least about 500° C. to evaporate said solvent and produce said mixed oxide.
Claim 2
Independent Claim
112 words
A method of making a continuous film of mixed oxide of at least two metals comprising: (A) preparing a solution which comprises: (1) an alkoxide source of one of said metals; (2) a chelate source of a second of said metals; and (3) sufficient solvent to solubilize the sources of said metals in said mixed oxide; (B) adding to said solution about 1 to about 2 moles of water per mole of said mixed oxide; (C) applying said solution to the surface of a substrate to form a coating on said substrate; and (D) heating said solution to at least about 500° C. to evaporate said solvent and produce said mixed oxide.
Claim 3
Dependent Claim
42 words
A method according to claim 1 wherein said mixed oxide has the general formula A x B y O z where A and B are metals and x times the valence of A plus y times the valence of B equals 2z.
Claim 4
Dependent Claim
28 words
A method according to claim 2 wherein said mixed oxide has the general formula ABO 3 where A is a bivalent metal and b is a tetravalent metal.
Claim 5
Dependent Claim
36 words
A method according to claim 3 wherein A is selected from the group consisting of barium, strontium, calcium, and mixtures thereof and B is selected from the group consisting of titanium, zirconium, hafnium, and mixtures thereof.
Claim 6
Dependent Claim
15 words
A method according to claim 4 wherein said mixed oxide is of cubic perovskite structure.
Claim 7
Dependent Claim
14 words
A method according to claim 5 wherein A is strontium and B is titanium.
Claim 8
Dependent Claim
13 words
A method according to claim 1 wherein said chelate is a metal β-diketonate.
Claim 9
Dependent Claim
14 words
A method according to claim 7 wherein said metal β-diketonate is a metal acetylacetonate.
Claim 10
Dependent Claim
11 words
A method of claim 1 wherein said solvent is dimethyl formamide.
Claim 11
Dependent Claim
22 words
A method according to claim 1 wherein said water is added to said solvent before said solvent is added to said sources.
Claim 12
Dependent Claim
11 words
A method according to claim 1 wherein said substrate is titanium.
Claim 13
Dependent Claim
11 words
A method according to claim 1 wherein said substrate is silicon.
Claim 14
Dependent Claim
28 words
A method according to claim 1 wherein said coating on said substrate is heated in hydrogen at 500° to 600° C. for 1/2 hour to dope said coating.
Claim 15
Dependent Claim
14 words
A method according to claim 1 wherein one of said metals is a dopant.
Claim 16
Dependent Claim
21 words
A method according to claim 1 wherein said solution includes about 0.01 to about 1 atomic percent of an n-type dopant.
Claim 17
Dependent Claim
22 words
A method according to claim 15 wherein said n-type dopant is selected from the group consisting of lanthanum, niobium, and mixtures thereof.
Claim 18
Dependent Claim
19 words
A method according to claim 1 including the additional last step of heating said solution in a reducing atmosphere.
Claim 19
Dependent Claim
12 words
A method according to claim 16 wherein said reducing atmosphere is hydrogen.
Claim 20
Dependent Claim
11 words
A method according to claim 1 wherein said substrate is glass.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-27 | 1988-05-28 | 1988-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-27 | 1992-05-28 | 1992-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-27 | 1996-05-28 | 1996-11-27 | $7700.00 | Window Closed / Lapsed |