Effect of Multiple Foreign Ions Doping on Metastable Structure of Alite
Effect of Multiple Foreign Ions Doping on Metastable Structure of Alite
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发表时间：
2012
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通讯作者：
Ouyang Shixi
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作者：
Ouyang Shixi
多种外来离子掺杂通过离子间的相互作用对阿利特产生影响,与单一掺杂的效果有显着偏差。本文采用X射线粉末衍射法,分别结合Rietveld法、差示扫描量热法和傅里叶变换红外光谱分析了Na+、Mg2+等7种典型外来离子的复合掺杂对阿利特亚稳结构和同素异形相变的影响。所有掺杂离子的典型浓度都有利于阿利特的形成，促进M3型阿利特的稳定化。Mg2+和Al3+对阿利特高温形态的稳定作用最为显着，Mg2+或Al3+的缺失均导致T3型阿利特的稳定化。另外，高P5+浓度（1%P2O5，质量分数，下同）的阿利特稳定为R对于稳定为M3型且Mg2+浓度较高(2%MgO)的阿利特，再加热时在600 ℃时向三斜晶的转变受到阻碍，而Fe3+的存在促进了这种转变。随着离子稳定的阿利特结构对称性的增加，获得了更高的四面体对称性。
Multiple foreign ions doping affects alite through the mutual interactions of these ions,which is significantly deviated from the effect of single doping.In this work,the effect of combined doping with seven typical foreign ions such as Na+,Mg2+,etc.on the metastable structure and allotropic phase transition of alite was analyzed by X-ray powder diffraction combined with the Rietveld method,differential scanning calorimetry and Fourier transform infrared spectroscopy,respectively.It was found that the combined doping with the typical concentrations of all the doped foreign ions could favour the formation of alite,and promote the M3-type alite stabilization.Mg2+ and Al3+ have the most significant effect on the stabilization of the higher-temperature forms of alite,and the ab-sence of either Mg2+ or Al3+ resulted in the stabilization of T3-type alite.In addition,alite with high P5+ concentration(1%P2O5,mass fraction,the same below) was stabilized as R type.For alite stabilized as M3 type and with high Mg2+ concentration(2%MgO),the reversion to triclinic at 600 ℃ on the reheating was blocked,and the presence of Fe3+ promoted this transformation.The higher sym-metry of tetrahedron was attained as the structural symmetry of ion-stabilized alite was increased.