Method of retaining melt of oxide

Details Method of retaining melt of oxide Method of retaining melt of oxide

1995-04-12

1997-05-27

Breneman, R. Bruce

Single-crystal, oriented-crystal, and epitaxy growth processes;

Processes joining independent crystals

117 2, 117 36, C30B 2916

Patent

active

056328117

ABSTRACT:
In order to stably retain an oxide-based melt consisting essentially of yttrium or a lanthanoid element, barium, copper and oxygen at a prescribed temperature with no impurity contamination thereby preparing a large oxide crystal of high quality from the melt, an oxide melt consisting essentially of yttrium or a lanthanoid element, barium, copper and oxygen is stored in a first crucible, which in turn is held in a second crucible. The first crucible is made of a material which is an oxide of at least one element forming the melt having a melting point higher by at least 10.degree. C. than a melt retention temperature and causing no structural phase transition up to a temperature higher by 10.degree. C. than the aforementioned prescribed temperature, with solubility of not more than 5 atomic percent with respect to the melt in a temperature range from the room temperature to a temperature higher by 10.degree. C. than the melt retention temperature. The second crucible is made of a material substantially causing neither melting nor chemical reaction with respect to the oxide-based melt, which can retain the melt more stably than the first material. Even if the melt overflows the first crucible, this overflow is suppressed by the second crucible. It is possible to prepare a crystal of an oxide superconductor such as YBa.sub.2 Cu.sub.3 O.sub.7-x (0.ltoreq.X.ltoreq.1) by the pulling method from the melt which is stored in the first crucible.

REFERENCES:
patent: 5078830 (1992-01-01), Shirata et al.
Yamada et al., "Continuous crystal growth of YBa.sub.2 Cu.sub.3 O.sub.7-x by the modified topseeded crystal pulling method", Physica C, vol. 217, 1993, pp. 182-188.
Gagnon et al., "Growth of YBa.sub.2 Cu.sub.3 O.sub.7-x crystals in thoria crucibles: twinning and optical effects", Journal of Crystal Growth, vol. 121, No. 4, Aug. 1992, pp. 559-565.
Barilo et al., "Growth of bulk single crystals of YBa.sub.2 Cu.sub.3 O.sub.7-.delta. from a new type of crucible", Journal of Crystal Growth, vol. 119, No. 3/4, May 1992, pp. 403-406.
Lombardo et al., "Growth of Bi.sub.2 Sr.sub.2 CaCu.sub.2 O.sub.8 single crystals using MgO crucibles", Journal of Crystal Growth, vol. 118, No. 3/4, Apr. 1992, pp. 483-489.
Dembinsky et al., "YBa.sub.2 Cu.sub.3 O.sub.7-x Single-crystal Growth by a New `Y.sub.2 O.sub.3 Consumable Crucible` Technique", Materials Science and Engineering, vol. B5, No. 3, Feb. 1990, pp. 345-349.
Patent Abstracts of Japan, vol. 13, No. 394 (C-631), Aug. 31, 1989 and JP-A-01 138 191, May 31, 1989.
IBM Technical Disclosure Bulletin, vol. 33, No. 2, Jul. 1990, p. 95.
Sen et al., "Creep of CuO-BaO Melts Along the Container Wall", Materials Letters, vol. 7, No. 12, Mar. 1989, pp. 433-436.
Watanabe "An approach to the growth of YBa.sub.2 Cu.sub.3 O.sub.7-x single crystals by the flux method. II" published in 1991 by Journal of Crystal Growth 114.
Elizabeth et al. "Growth and extraction of flux free YBCO crystals" published in 1992 by Journal of Crystal Growth 121.
Yamada et al. "Continuous crystal growth of Y 123 by the modified top-seeded solution growth" published in 1993 by the 54th Scientific Lecture Meeting of the Japan Society of Applied Physics.
Yamada et al. "Enlargement of high temperature superconductor YBCO, single crystal" published in 1993 by Applied Physics.
"Double Crucible Method for the Growth of large oxide single crystals"; Wang, et al., J. Cryst. Growth (1990), 106 (2-3), pp. 483-486.

Affiliated with

Also associated with

Rating

Method of retaining melt of oxide does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of retaining melt of oxide, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of retaining melt of oxide will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2326175