【摘要】 采用温差水热法,以分析纯的Al(OH)3和BeO以及无色纯净的石英为原材料,球形和//s(1121)的片状无色绿柱石为籽晶,在复杂的盐酸混合溶液中生长了无色透明的绿柱石晶体。利用双圈反射测角仪、电子探针、X射线衍射仪和红外光谱仪等仪器,对合成绿柱石晶体的形态、成分及晶体结构进行了详细的研究。结果表明,合成的绿柱石晶体为六方短柱状,主要发育平行双面c{0001}、六方柱m{100}、a{110}和六方双锥p{101}四种单形。合成的绿柱石晶体的成分中(Na2O+K2O)的质量分数约为0.59%,且c0/a0值为0.9988,可归属于"正常"绿柱石向"四面体"绿柱石的过渡范畴。在中性或弱碱性环境体系中,通过调整绿柱石中各成分的百分含量,有望在更低的温度、压力条件下合成出高质量的板柱状绿柱石晶体。更多还原

【Abstract】 Using Al(OH)3,BeO and pure quartz as raw materials,the achromatism and translucent beryl crystals were grown by hydrothermal method.The beryl crystals grown in complicated hydrochloric acid system.The seeds are spherical and //s(111) orientation.The crystal morphology,chemical composition and crystal structure were studied by double coil reflecting goniometer,electron probe microanalysis,X-ray diffractometer and infrared Absorption spectroscopy.The results show that the synthetic beryl crystals are short hexagonal prism with four single form,they are parallel twins c{0001},hexagonal prism m{100} and a{110} and hexagonal double wimble p{101}.In chemical component of the beryl crystals,wt(Na2O+ K2O)% about 0.59wt%,and c0/a0 is 0.9988,so we believed the hydrothermal beryl crystal is "normal" beryl convert to "tetrahedron" beryl.The high quality beryl crystal could be synthesized at lower temperature and lower pressure in alkalescent solution by adjusting the content of every componential,especially the content of the alkali metals in beryl crystal.更多还原