天然及合成的硅灰石的高压研究  

HIGH PRESSURE STUDY ON WOLLASTONITE

作　　者：杨景海[1] 姚斌[1] 刘宏建[1] 耿义志[1] 苏文辉[1] 张巨元[1] 

机构地区：[1]四平师范学院固体物理研究所,中国科学院金属研究所快速凝固国家重点实验室,吉林大学物理系固体物理教研室

出　　处：《高压物理学报》1994年第3期237-240,共4页Chinese Journal of High Pressure Physics

基　　金：吉林省教委青年基金

摘　　要：研究了天然硅灰石（ＣａＳｉＯ＿３）的压致相变，并采用高温高压方法直接合成了硅灰石。结果表明：天然硅灰石经高压（４．６～５．０ＧＰａ）高温（１２００～１２５０℃）处理后转变为深玫瑰色半透明立方晶体，而采用高温（１０５０～１１００℃）高压（３．８～４．３ＧＰａ）直接合成的硅灰石也具有同样结构及形貌。ＳＥＭ分析表明：天然硅灰石ＳｉＯ＿２及ＣａＯ的含量分别为５０．８％和４８．１％，而人工合成的产物ＳｉＯ＿２及ＣａＯ含量分别为５１．３５％和４８．１５％。The wollastonite(CaSiO_3 )synthesized by high temperature(HT)under atmo-spheric pressure(AP) has a triclinic structure while the natural wollastonite with high purity o-riginating from Dading Mountain,Lishu,Jilin Province,China,has a white chain-like structure of monoclinic type.Pressure-induced phase transformation of this natural wollastonite above and the wollastonite synthesized directly from raw materials by HP and HT were firstly investigated.Re-sults show that the natural wollastonite treated under HP(4.6～5.0GPa)and HT(1200～1250℃)transforms to partially translucent cubic crystal with dark rose colour and the one syn-thesized directly by HP(3.8～4.3GPa)and HT( 1050～1100℃)to the same structure and with similar appearance. SEM analysis indicates that,for the natural wollastonite,the contents of SiO_2 and CaO are 50.8%and 48.1%respectively,while the synthetic one,both treated and synthe-sized directly by HP and HT,has the contents 5 1.35%and 48.15%respectively.

关 键 词：硅灰石 高压 合成 结构相变 

分 类 号：TQ170.4[化学工程—硅酸盐工业]