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    • 9. 发明授权
    • Method for producing calcite-type calcium carbonate single crystal
    • 方解石型碳酸钙单晶的制备方法
    • US6048396A
    • 2000-04-11
    • US886126
    • 1997-07-03
    • Kazumichi YanagisawaIsao Matsushita
    • Kazumichi YanagisawaIsao Matsushita
    • C30B7/10C30B7/00C30B29/10
    • C30B7/00C30B29/10
    • This invention provides a method for producing calcite-type calcium carbonate single crystal available for optical elements, which can be carried out under relatively low temperature and low pressure conditions. The crystal growth process which comprises; a first step of filling a sealed pressure container of an autoclave with solvent and calcium carbonate as a raw material for growth, a second step of dissolving the starting rate in the solvent under predetermined conditions of pressure and temperature, a third step of crystallizing the calcium carbonate on a seed crystal suspended in the upper portion of the pressure container, on account of the difference of solubility caused by temperature gradient in the container; the method is characterized by that the aqueous solution of ammonium salt of mono-carboxylic acid is used as the solvent. The ammonium salt of mono-carboxylic acid is selected from the ammonium salts of carboxylic acid of whose alkyl group has 1 to 6 carbons, such as ammonium salts of acetic acid, propionic acid, butyric acid, valeric acid, hexanoic acid (equal to caproic acid), and heputanic acid (equal to enantic acid).
    • 本发明提供了一种可用于光学元件制备方解石型碳酸钙单晶的方法,该方法可在较低温度和低压条件下进行。 晶体生长过程包括: 以溶剂和碳酸钙作为生长原料填充高压釜的密封压力容器的第一步骤,在预定的压力和温度条件下将起始速率溶解在溶剂中的第二步骤,使钙 碳酸盐悬浮在压力容器的上部的晶种上,由于容器中温度梯度引起的溶解度差; 该方法的特征在于使用单羧酸铵盐水溶液作为溶剂。 单羧酸铵盐选自其烷基具有1至6个碳原子的羧酸的铵盐,例如乙酸,丙酸,丁酸,戊酸,己酸的铵盐(等于己酸 酸)和氢氧化钠(等于酸性酸)。