硅酸盐学报

杂质缺陷诱导阿利特晶胞常数的改变及多晶转变

作者：管宗甫陈益民郭随华秦守婉朱晓燕

单位：郑州大学材料科学与工程学院中国建筑材料科学研究院中国建筑材料科学研究院中国建筑材料科学研究院中国建筑材料科学研究院郑州450052 北京100024 北京100024 北京100024 北京100024

关键词：掺杂缺陷晶格常数改变阿利特多晶型

分类号：TQ172.11

出版年,卷(期):页码：2006,34(1):70-75

DOI：

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 Ca_3SiO_3 (C_3S) is a very important mineral in portland clinker. The rhombohedral pattern R of alite stabilized by certain impure ions is more hydrated. The impure ions form defects in the C_3S crystal lattice. The defects can induce change in the crystal lattice constant. Calculations and tests indicate that the symmetry of C_3S 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 C_3S solid solution can be estimated. Pure C_3S was synthesized and C_3S 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 C_3S had the lowest symmetry and had a triclinic form. The polymorph of C_3S solid solution has a monoclinic M_1 form when doped with P_2O_5 0.4% (in mass fraction, the same below). If the contents of CaF_2 in C_3S are 1.0%, the crystal form of C_3S is also M_1. And the rhombohedral form R of C_ 3S solid solution is stabilized with 2.0% CaF_2 doping. With complex doping of P_2O_5 and CaF_2, the symmetry of C_3S solid solution can be improved remarkably. By adding 0.4% P_2O_5 and 0.7% CaF_2 into C_3S, the R form is stabilized. The extracted alite from the experimental clinker doped with P_2O_5 and CaF_2 is an admixture of R and M_3 form, and the alite from the ordinary clinker is M_1 polymorph. The XRD results conform to the predictions from calculations.

基金项目：

国家重点基础研究发展规划(2001CB610701)资助项目。

作者简介：

参考文献：

[1]REGOURDMM,BOIKOVAAI.Chemistry,structure,propertiesandqualityofclinker[A].9thInternationalCon gressontheChemistryofCement[C],NewDelhi,India,1992.345. [2]MAKII,KATOK.Phaseidentificationofaliteinportlandce mentclinker[J].CemConcrRes,1982,12(1):93100. [3]GUINIERA,REGOURDM.Structureofportlandcement minerals[A].Proceedingsofthe5thInternationalSympo siumontheChemistryofCement[C],Tokyo,Japan,1968.127. [4]TAYLORHFW.CementChemistry[M].London:Aca demicPress,1990.1315. [5]LIEBAUF.硅酸盐结构化学(中译本)[M].席耀忠译.北京:中国建筑工业出版社,1989.1868.LIEBAUF.StructuralChemistryofSilicates:Structure,Bonding,andClassification(inChinese).XIYaozhongtransl.Beijing:ChinaArchitecture&BuildingPress,1989.1868. [6]BOIKOVAAI.Chemicalcompositionofrawmaterialasthe mainfactorresponsibleforthecomposition,structureand propertiesofclinkerphases[A].8thInternationalCongress ontheChemistryofCement[C],RiodeJaneiro,Brazil,1986.1933.

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