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    • 4. 发明专利
    • PRODUCTION OF COMPOUND POLYCRYSTAL
    • JPH09208386A
    • 1997-08-12
    • JP2120096
    • 1996-02-07
    • NIKON CORP
    • HAMAMURA HIROSHI
    • C01B17/20C30B28/08
    • PROBLEM TO BE SOLVED: To provide a method for producing a compound polycrystal of more than two components containing S, enabling the large amount synthesis without having an explosion of an ampule caused by an elevation of the inside pressure and the damage of an electric oven by setting specific three processes. SOLUTION: This method for producing a compound polycrystal includes a process of vacuum sealing a raw material into an ampule arranging a high temperature part for a synthetic reaction and a low temperature part for trapping S in a liquid state before the reaction, a process of conducting the synthetic reaction by heating the high temperature part and a process of vaporizing the liquid state S in the low temperature part by heating and performing the synthetic reaction in the high temperature part. For example, the middle part of a quartz tube of which one end is closed and inside is evacuated, is heated with a burner from outside to form a projected part in inside thereof, and the ampule shown in the figure is obtained by vacuum sealing raw materials of 0.045mol Cu, 0.045mol Ga and 0.09mol S after cooling. A CuGaS2 polycrystal is obtained by placing the ampule in a core tube of a horizontal type electric oven by putting the projected part at under side thereof, keeping the high temperature side at 800 deg.C for 14hr, then heating up to 1,250 deg.C to consume all of the trapped S, keeping for 24hr and then rapidly cooling outside the oven.