US3607137A
Expired / Lapsed
US
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Method of avoiding strain in phase transitions of single crystals
Assignee: Sharp Corp
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Filing: 1967-11-17
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Granted: 1971-09-21
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Expires: 1987-11-17
Abstract
Abstract Method for growing crystals of inorganic metal salts from a melt which comprises cooling a single crystal of an inorganic metal salt having at least one solid-solid transition point in a stable structure of a higher temperature in such a manner that the crystal passes through the transition point from an end of the crystal to another end of the same to obtain the corresponding single crystal in a stable structure of a lower temperature, the transition interface being at such a distance from the solidliquid interface that the strain caused by the solid-solid transition does not exert any influence on the solid-liquid interface.
Inventors
- 👤 Toshio Inoguchi
- 👤 Ichihiko Niwa
- 👤 Katsuro Nakazawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:03
CPC Classifications
C; C30; C30B; C30B11/00; C30B29/00; C30B29/10; C30B29/12; Y; Y10; Y10S; Y10S117/00; Y10S117/90
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
24 words
The method according to claim 1, wherein the single crystal passes through the transition point after its crystallization from the corresponding melt is completed.
Claim 2
Dependent Claim
27 words
The method according to claim 1, wherein one portion of the single crystal passes through the transition point while another portion is being crystallized from a melt.
Claim 3
Dependent Claim
25 words
The method according to claim 1, wherein the cooling is effected in a quartz glass tube provided with a carbon film on the inner wall.
Claim 4
Dependent Claim
14 words
The method according to claim 1, wherein the inorganic metal salt is cuprous chloride.
Claim 5
Dependent Claim
23 words
The method according to claim 1 wherein, the distance between the solid-liquid interface and the solid-solid transition interface is more than 1 cm.
Claim 6
Dependent Claim
138 words
A method according to claim 1, wherein the final single crystal is obtained by first passing the inorganic metal salt through one heat zone at a temperature above the melting point of the inorganic metal salt and gradually passing the melt through a second heat zone at a temperature lower than the melting temperature of the inorganic salt but above the transition point of the inorganic metal salt to form a single crystal of a stable structure at a higher temperature and then gradually passing the crystal through a heat zone which has a temperature lower than the solid to solid transition temperature of the inorganic metal salt whereby a single crystal having a structure stable at a lower temperature is obtained, the distance between the solid-liquid interface and the solid-solid transition interface being more than 1 cm.
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) | 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 |