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High Pressure Hydroghermal Growth of Beryl Single Crystals

绿柱石单晶的高压水热生长

基本信息

批准号：
61470066
负责人：
KODAIRA Kohei
金额：
$ 4.29万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

项目摘要

Beryl crystals were grown from nonequilibrium state by dissolution-precipitation of each starting powders.Under high pressure hydrothermal conditions,crystal growth was observed at 500゜ー650゜C and 0.1-0.3N NaOH solutions.Clear and smooth beryl crystals were grown from the most suitable condition at 600゜C and 0.1N NaOH solution.Representative P(101^^-1)face for hydrothermal growth was developed.The P(101^^-1)fece seems to have relatively high growth rate comparing with that of other m(101^^-1)and c(0001) faces.In the IR spectra of the beryl crystals obtained from 0.1-0.3N NaOH solutions, two sharp stretch at 3690 and 3580 cm^<-1> were observed.There are large differences in the IR spectra of synthetic hydrothermal emeralds and that investigated by the present beryl,both of which show a sharp OH stretch band at 3690 cm^<-1>. In addition this band, high pressure hydrothermal beryl exhibits a sharp band at 3580 cm^<-1>,Hich is the same as the natural Colombian emerald.The high pressure hybrothermal beryl can not be distinguished with natural ones.The channel was also somewhat large for the direction of a-axis in the present beryl comparing with the emeralds grown by flux method on account of alkali cations and wster.The refractive index and densities were clearly large so as to be in natural emeralds.

通过各起始粉末的溶解-沉淀，从非平衡状态生长绿柱石晶体。在高压水热条件下，在 500゜ー650゜C 和 0.1-0.3N NaOH 溶液中观察到晶体生长。在 600゜C 和 0.1N NaOH 溶液中从最合适的条件生长出清晰光滑的绿柱石晶体。代表 P(101^^-1) 面用于热液与其他m(101^^-1)和c(0001)面相比，P(101^^-1)fece似乎具有相对较高的生长速率。从0.1-0.3N NaOH溶液获得的绿柱石晶体的红外光谱中，观察到在3690和3580 cm^<-1>处的两个急剧拉伸。合成的绿柱石晶体的红外光谱存在较大差异热液祖母绿和现有绿柱石研究的结果均在 3690 cm^-1 处显示出尖锐的 OH 伸缩带。另外，高压热液绿柱石在3580 cm^<-1>处出现了一条尖锐的谱带，与天然哥伦比亚祖母绿相同。高压热液绿柱石与天然绿柱石无法区分。由于碱阳离子和水的影响，目前的绿柱石与助熔剂法生长的祖母绿相比，在a轴方向上的通道也稍大。折射率和密度显然很大，属于天然祖母绿。