US3607752A
Expired / Lapsed
US
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Process for the culture of large monocrystals of lithium niobate
Assignee: BASF Schweiz AG
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Filing: 1970-06-30
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Granted: 1971-09-21
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Expires: 1990-06-30
Abstract
Abstract The present invention relates to a process for cultivating larger unstressed single-domain crystals containing niobium and an alkali metal, preferably lithium. The process is conducted by the Zochralski technique for cultivating crystals from a melt in an oxidizing moist atmosphere by means of resistance heating, which maintains an electric short circuit between crystal seed and the melt.
Inventors
- 👤 Heini Graenicher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:18
CPC Classifications
C; C30; C30B; C30B15/00; C30B29/00; C30B29/10; C30B29/16; C30B29/22; C30B29/30; Y; Y10; Y10S; Y10S117/00; Y10S117/906
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
19 words
A process according to claim 1, wherein said moist oxidizing atmosphere contains at least 80 volume percent of oxygen.
Claim 2
Dependent Claim
38 words
A process according to claim 1, wherein said moist oxidizing atmosphere contains at least 80 volume percent of oxygen and has a steam partial pressure which corresponds to saturation at a temperature of from 24 to 26* C.
Claim 3
Dependent Claim
29 words
A process according to claim 1, wherein said oxidizing moist atmosphere has a steam partial pressure which corresponds to saturation at a temperature of from 24 to 26* C.
Claim 4
Dependent Claim
26 words
A process according to claim 1, wherein said moist oxidizing atmosphere has a steam partial pressure which corresponds to saturation at a temperature of 25* C.
Claim 5
Dependent Claim
30 words
A process according to claim 1, wherein a doping material is included in the melt in an amount of 0.1 to 2.0 atom percent Nd in the form of Nd2O3.
Claim 6
Dependent Claim
28 words
A process according to claim 1, wherein a doping material is included in the melt in an amount of 0.5 atom percent Nd in the form of Nd2O3.
Claim 7
Dependent Claim
16 words
A process according to claim 1, wherein the moist atmosphere consists of oxygen and water vapor.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |