Title:
【発明の名称】イットリウムアルミニウムガーネットの製造方法
Document Type and Number:
Japanese Patent JP2673161
Kind Code:
B2
Abstract:
PURPOSE:To obtain raw material powder of product containing small number of secondary particle, capable of sintering readily and giving high transparent sintered compact by making existence of specific amount of sulfate ion at precipitation in a producing method of adding urea to an acidic aqueous solution containing Y ion and Al ion and precipitating. CONSTITUTION:An acidic aqueous solution containing Y ion and Al ion is neutralized by urea and precipitate is generated, then resultant precipitate is calcined to obtain yttrium aluminium garnet(YAG). In said process, sulfate ion in an amount of 0.1-1.2mol times of total amount of Y ion and Al ion is contained in the acidic aqueous solution. By said method, YAG raw material powder in which growth of secondary particle is small is obtained. Next, 100-2500wt.ppm. SiO2 is added to said powder and the powder is sintered at 1650-1900 deg.C under no oxygen atmosphere to afford polycrystalline YAG sintered material having high light transmittance. With the above-mentioned two critical values of sulfate ion, granular precipitate is obtained for above the lower critical value and only material having low sintering ability is obtained at above the higher critical value.
Inventors:
Haeda Hajime
Shinichi Shirasaki
Shinichi Matsuda
Akio Watanabe
Yasuhiro Matsumoto
Takayuki Yanagiya
Shinichi Shirasaki
Shinichi Matsuda
Akio Watanabe
Yasuhiro Matsumoto
Takayuki Yanagiya
Application Number:
JP24289088A
Publication Date:
November 05, 1997
Filing Date:
September 27, 1988
Export Citation:
Assignee:
Director, Institute for Inorganic Materials, Science and Technology Agency
Kamijima Chemical Co., Ltd.
Kamijima Chemical Co., Ltd.
International Classes:
C04B35/50; C01F17/00; (IPC1-7): C01F17/00; C04B35/50
Attorney, Agent or Firm:
Akira Shioiri