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采用X射线衍射结合Rietveld方法、热释光及微量热分析,研究了在Na、K等熟料阿利特中常见固溶组分作用下,Al2O3掺杂对阿利特结构、缺陷及水化活性的影响。结果表明:约1/3Al取代Ca,2/3Al取代Si;少量Al2O3即可将阿利特稳定为M3型,且M3晶格常数随Al2O3含量增加呈线性变化,直至达到Al2O3固溶极限1%(质量分数),符合Vegard固溶体定律;Al2O3进入阿利特,形成杂质缺陷,使其热释光性及水化反应动力学特征随之发生显著变化,且缺陷类型对水化的影响比浓度的影响更为显著;阿利特原始热释光强度与其水化反应活性大小一致,这与阿利特中以俘获电子形式亚稳储藏的能量有关。
Abstract：The effect of alumina(Al2O3) doping on the crystal structure,defects and hydration behavior of alite with some impurities like Na,K,etc.,were investigated by X-ray powder diffraction with the Rietveld method,thermoluminescence and isothermal calo-rimetry.It was indicated that one third of Al could replace Ca,and two thirds of Al could replace Si.A small amount of Al2O3 was effective for M3-type alite stabilization,and the lattice parameters of the M3 polymorph with the content of Al2O3 was essentially linear,up to the limits of Al2O3 of 1%(in mass),which followed the Vegard's law.The incorporation of Al2O3 resulted in the more extrinsic defects,affecting the thermoluminescence(TL) and hydration kinetics of alite.The hydration behavior of alite did not de-pend much on the concentrations of defects as the types of defects.The variation in the intensity of the original TL for alites was in accordance with their hydration reactivity for 3 days,which was related to the metastable energy stored as traped electrons.
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基本信息:
DOI：10.14062/j.issn.0454-5648.2012.02.018
中图分类号:TQ172.11
引用信息:
[1]任雪红,张文生,王彬,等.多组分组合作用下Al_2O_3掺杂对阿利特结构及活性的影响[J].硅酸盐学报,2012,40(02):200-206.DOI:10.14062/j.issn.0454-5648.2012.02.018.
基金信息:
国家自然科学基金(50972137);; 国家“973”计划(2009CB623101)资助项目
2012-01-06
2012-01-06
2012-01-06