氧化铁掺杂对阿利特结构及活性的影响(英文)

Effect of Ferric Oxide Doping on Structure and Reactivity of Alite with Multiple Impurities

用X射线衍射结合Rietveld方法、热释光及微量热分析等,研究了Fe2O3掺杂对同时固溶有Na、K等多种杂质的典型组成阿利特的结构及性能的影响。结果表明:阿利特晶型未发生改变,晶格常数随Fe2O3掺量呈线性变化,并在Fe固溶类型改变处(0.6%Fe2O3)发生突变,符合Vegard固溶体定律。阿利特水化活性和原始热释光性均显著降低,并呈现正相关性,且相关性主要体现在结晶成核与晶体生长控制过程。这一现象可以归因于储存在阿利特中的介稳能量,据此提出了Fe影响阿利特水化的新机制。

The effect of ferric oxide （i.e., Fe203） on the structure and reactivity of typical alite in the simultaneous presence of Na＋, K＋, etc. was investigated by X-ray powder diffraction with the Rietveld method, thermoluminescence and isothermal calorimetry, respectively. The results show that there is no change on the polymorphic form of alite, the lattice parameter of alite varies linearly with iron content and has a discontinuity at 0.6% Fe2O3 due to the flexible substitution pattern of Fe, which follows the Vegard＇s law. The original thermoluminescence intensity and hydration reactivity were greatly decreased. It is demonstrated that there is a positive correlation between the hydration reactivity and the original thermoluminescence, which mainly pans out during the nucleation and growth process. This phenomenon could be due to the extra energy stored in alite. Based on these findings, the mechanism of how Fe affects the reactivity of alite was proposed.