Title:
APPARATUS FOR PRODUCING SINGLE CRYSTAL AND METHOD FOR PRODUCING SINGLE CRYSTAL
Document Type and Number:
WIPO Patent Application WO/2018/003386
Kind Code:
A1
Abstract:
[Problem] To produce high-quality large single crystals free of grain boundaries which have a composition having a uniform optimum additive density in both the vertical direction and the horizontal direction and which have less negative crystals and exsolution lamellae. [Solution] This apparatus for producing single crystals includes at least: a quartz crucible in which seed crystals are placed at a bottom portion thereof; a powder starting material supplying means that supplies a powder starting material into the quartz crucible; and an infrared irradiation means that irradiates the powder starting material supplied into the quartz crucible by the powder starting material supplying means with infrared radiation. The apparatus for producing single crystals melts the powder starting material by irradiating the inside of the quartz crucible with infrared radiation with the infrared irradiation means and solidifies the powder starting material to produce the single crystals inside the quartz crucible. The apparatus for producing single crystals is configured to supply the powder starting material into the quartz crucible by the powder starting material supplying means while irradiating the supplied powder starting material with infrared radiation with the infrared irradiation means, and to continuously supply the powder starting material into the quartz crucible by the powder starting material supplying means according to the amount of the molten powder starting material that has been solidified.
Inventors:
SHINDO ISAMU (JP)
Application Number:
PCT/JP2017/020227
Publication Date:
January 04, 2018
Filing Date:
May 31, 2017
Export Citation:
Assignee:
CRYSTAL SYSTEMS CORP (JP)
International Classes:
C30B29/06; C30B11/08
Foreign References:
| JP2004189537A | 2004-07-08 | |||
| JPH05286791A | 1993-11-02 | |||
| JPS61197493A | 1986-09-01 | |||
| JPH09249494A | 1997-09-22 | |||
| JP2014076915A | 2014-05-01 |
Other References:
See also references of EP 3305948A4
Attorney, Agent or Firm:
SSINPAT PATENT FIRM (JP)
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