高压变质二氧化硅矿物的合成及表征

根据高能机械球磨与地球板块碰撞之间具有的碰撞局域性和剪切应力相似的特点, 采用高能机械球磨和静高温高压技术, 以α-石英与石墨混合粉末为原料, 提出了人工合成地表柯石英的一种新方法. 利用高能机械球磨制备了α-石英和石墨纳米非晶混合粉末, 其高温高压合成柯石英的最低条件是970 K和3.7 GPa. 合成的柯石英有10个Raman峰, 分别位于120, 152, 179, 206, 270, 329, 357, 428, 467和521 cm-1, 是目前最全的柯石英Raman谱.

Synthesis and Characterization of High-pressure Metamorphic SiO2 Minerals

We suggest a new laboratory method for synthesizing coesite in the earth's crust by considering the similarity characteristics of local collisions and shearing strength between the earth's plates and high energy mechanical ball milling(MBM), combining the high-energy MBM and high static pressure and high temperature technique, and using mixtures of α-quartz and graphite as the initial material. The nanometer amorphous mixture of α-quartz and graphite was prepared by high-energy MBM. The lowest pressure and temperature for synthesizing coesite are 3.7 GPa, 970 K. The Raman spectrum of synthetic coesite possessed ten peaks located at 120, 152, 179, 206, 270, 329, 357, 428, 467 and 521 cm-1. The obtained spectrum is coesite Raman spectrum with the most peaks among published results. The author attempts to look for useful information about the mineral circumstance of coesite in the Earth'surface and the mechanism of the ultrahigh-pressure metamorphism.