杂质缺陷诱导阿利特晶胞常数的改变及多晶转变  

CRYSTAL LATTICE CONSTANT CHANGE AND POLYMORPH OF ALITE CAUSED BY IMPURITY DEFECTS

作　　者：管宗甫[1] 陈益民[2] 郭随华[2] 秦守婉[2] 朱晓燕[2] 

机构地区：[1]郑州大学材料科学与工程学院,郑州450052 [2]中国建筑材料科学研究院,北京100024

出　　处：《硅酸盐学报》2006年第1期70-75,共6页Journal of The Chinese Ceramic Society

基　　金：国家重点基础研究发展规划(2001CB610701)资助项目。

摘　　要：阿利特或硅酸三钙,(C3S)固溶体是水泥熟料中最重要的矿物,某些杂质离子可以稳定其多晶型中的三方R型,具有较高的水化活性。杂质离子固溶进入C3S晶格,形成杂质缺陷,这些缺陷引起C3S晶格常数的变化。研究显示:C3S晶格常数的变化与其对称性有关,从而提出了一种由杂质缺陷引起晶格常数相对变化的计算方法,用于预测C3S固溶体和阿利特可能的稳定晶型。在实验室合成了不同掺杂的C3S固溶体单矿物,并从实验熟料中萃取了阿利特。对样品晶型进行X射线衍射(Xraydiffraction,XRD)测定及晶格常数相对变化计算的预测。计算预测结果和XRD分析结果之间较好相符。XRD分析表明:纯C3S的对称性最差,属于三斜晶系。当C3S中P2O5固溶量在0.4%(质量分数,下同)时,C3S固溶体为单斜M1型。当CaF2掺量在1.0%时,C3S固溶体也为M1型。当CaF2掺量提高到2.0%时,C3S固溶体是R型。复合掺加氟磷对改变C3S固溶体对称性有显著作用,只要掺杂0.4%的P2O5和0.7%的CaF2即可使R型C3S固溶体在室温下稳定。对熟料中萃取阿利特的分析表明:普通熟料中萃取阿利特的稳定晶型属于M1型;含氟磷的熟料中阿利特是以R型为主的R型和M3型的混合体。分析结果验证了计算预测结果。Alite or solid solution of Ca3SiO3 （C3S） is a very important mineral in portland clinker. The rhombohedral pattern R of Mite stabilized by certain impure ions is more hydrated. The impure ions form defects in the C3S crystal lattice. The defects can induce change in the crystal lattice constant. Calculations and tests indicate that the symmetry of C3S is related to the change in crystal lattice constant. Thus, a method for calculating the crystal lattice constant change brought about by doping ions was suggested. With the calculation results, the possible polymorphs of C3S solid solution can be estimated. Pure C3S was synthesized and C3S solid solutions that contain certain ions were prepared. Alites were extracted from experimental clinkers. The polymorphs of the samples were examined by X-ray diffraction （XRD） and deduced with the calculations of the crystal lattice constant changes. The calculation results are coordinated with the XRD testing results. The results show that pure C3S had the lowest symmetry and had a triclinic form. The polymorph of C3S solid solution has a monoclinic M1 form when doped with P2O5 0.4% （in mass fraction, the same below）. If the contents of CaF2 in C3S are 1.0%, the crystal form of C3S is also M1. And the rhombohedral form R of C3S solid solution is stabilized with 2.0% CaF2 doping. With complex doping of P2O5 and CaF2, the symmetry of C3S solid solution can be improved remarkably. By adding 0.4% P2O5 and 0.7% CaF2 into C3S, the R form is stabilized. The extracted Mite from the experimental clinker doped with P2O5 and CaF2 is an admixture of R and M3 form, and the alite from the ordinary clinker is M1 polymorph. The XRD results conform to the predictions from calculations.

关 键 词：掺杂 缺陷 晶格常数改变 阿利特 多晶型 

分 类 号：TQ172.11[化学工程—水泥工业]