Title:
BLUE-COLORED ALUMINUM OXIDE SINGLE CRYSTAL AND METHOD FOR PRODUCING ALUMINUM OXIDE SINGLE CRYSTAL
Document Type and Number:
WIPO Patent Application WO/2017/187647
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide, at an industrially reasonable cost, an aluminum oxide single crystal which exhibits a bright blue color, such as sky blue or marine blue, even to the interior of the crystal. In the present invention, the crystal grows from a starting material which has a cobalt concentration with respect to aluminum atoms of 1700 to 13700 ppm by using a flame fusion method using hydrogen-oxygen flames. Alternatively, the crystal grows from a starting material which has a cobalt concentration with respect to aluminum atoms of 5000 to 20000 ppm by using a rotating and pulling method. Subsequently, in an atmosphere of oxygen partial pressure of 10-6 to 10-9 atm, the crystal is heat treated at a predetermined temperature. Thus, this production method allows a blue-colored aluminum oxide single crystal which has a cobalt concentration with respect to aluminum atoms of 50 to 130 ppm to be produced.
Inventors:
TAKAHASHI MAKI (JP)
ASAKA SHOHEI (JP)
KAWAMINAMI SHUICHI (JP)
ASAKA SHOHEI (JP)
KAWAMINAMI SHUICHI (JP)
Application Number:
PCT/JP2016/063616
Publication Date:
November 02, 2017
Filing Date:
April 25, 2016
Export Citation:
Assignee:
SHINKOSHA KK (JP)
International Classes:
C30B29/20
Foreign References:
| JP2011524326A | 2011-09-01 | |||
| JPS60231490A | 1985-11-18 | |||
| JPS60191098A | 1985-09-28 | |||
| CN101941727A | 2011-01-12 |
Other References:
SAITO, YUKINORI ET AL.: "Coloration of sapphire by Co ion implantation", NUCLEAR INSTRUMENTS AND METHODS IN PHYSICS RESEARCH SECTION B:BEAM INTERACTIONS WITH MATERIALS AND ATOMS, vol. 59 -60, 1991, pages 1173 - 1176, XP055067488, ISSN: 0168-583X
KEIG, G.A.: "Influence of the valence state of added impurity ions on the observed color in doped aluminum oxide single crystals", JOURNAL OF CRYSTAL GROWTH, vol. 2, 1968, pages 356 - 360, XP024420300, ISSN: 0022-0248
KEIG, G.A.: "Influence of the valence state of added impurity ions on the observed color in doped aluminum oxide single crystals", JOURNAL OF CRYSTAL GROWTH, vol. 2, 1968, pages 356 - 360, XP024420300, ISSN: 0022-0248
Attorney, Agent or Firm:
FUKUDA, Shinichi et al. (JP)
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