含镁硬硅钙石合成及晶体结构研究  

Synthesis and Crystal Structure of Xonotlite Doping with Magnesium

作　　者：代司晖[1] 金莉莉[1] 王昶[1] 李兆恒[2] DAI Si-hui;JIN Li-li;WANG Chang;LI Zhao-heng(Guangzhou Panyu Polytechnic,Guangzhou 511483,China;School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]广州番禺职业技术学院,广州511483 [2]华南理工大学材料科学与工程学院,广州510640

出　　处：《武汉理工大学学报》2021年第11期12-16,共5页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(51172075,51802099)。

摘　　要：水热合成含不同Mg的硬硅钙石,采用XRD、高精度SEM以及晶体结构分析软件对其结构进行解析。结果表明:水热条件下Mg/Ca原料与硅灰反应产物主要是含镁硬硅钙石,约10%左右Mg^(2+)进入到硬硅钙石的晶格,取代Ca^(2+)位置;Mg^(2+)取代Ca^(2+)对001和202晶面影响不大,然而造成202晶面发生显著变化,晶面间距缩小0.26A;Mg^(2+)进入硬硅钙石晶体主要占据硅氧双链内层Ca3和Ca4离子位置,引起硅氧链收缩,导致了Si3位点坐标产生较大变动。Xonotlites doping with Mg;were synthesized by hydrothermal method,and their structure were analyzed by XRD,high-precision SEM and Computation model.The results show that the reaction product of MgO/CaO and silica fume by hydrothermal conditions is mainly xonotlite doping with Mg^(2+),and about 10% Mg;could enters the lattice of xonotlite.In the lattice of xonotlite Mg^(2+) tends to be enriched on the crystal plane(202)and has little effect on the crystal plane(001)and(202).However,the crystal plane spacing of(200)decreases obviously,the a-axis direction crystal plane spacing of xonotlite lattice decreased to 0.26A.Mg^(2+)in xonotlite crystal lattice mainly occupies the Ca3 and Ca4 sites,then it causes the silicon oxygen chain contracting and coordinates of Si3 sites changing obviously.

关 键 词：水热法 合成 晶体结构 硅氧链 

分 类 号：TB321[一般工业技术—材料科学与工程]