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多离子复合掺杂对阿利特介稳结构的影响

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Abstract:

多离子固溶对阿利特的影响产生复合效应,与单一离子显著不同。采用X射线衍射结合Rietveld方法、差示扫描量热、红外光谱等,研究了Na+、Mg2+等熟料阿利特中7种典型杂质离子复合掺杂对阿利特介稳结构及多晶转变的影响。结果表明7种离子以常规含量复合存在时,显著促进阿利特烧成,并主要稳定M3型阿利特,Mg2+及Al3+对稳定阿利特高温型结构的影响最大,不含Mg2+或Al3+阿利特以T3型为主;高含量P5+(1%P2O5,质量分数,下同)可稳定R型阿利特;高含量Mg2+(2%MgO)稳定的M3型,在600℃附近向三斜晶型的再次受热转变受阻,而Fe3+促进这一转变;随离子稳定阿利特结构对称性的提高,[SiO4]四面体的对称性也提高

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