Crystallographic Analysis of Sr-Bearing Ye'elimite
Crystallographic Analysis of Sr-Bearing Ye'elimite
复制标题
含锶冶铁矿的晶体分析
DOI：
10.1007/s10904-017-0631-8
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发表时间：
2017
影响因子：
4
通讯作者：
Chang Jun
中科院分区：
文献类型：
--
作者：
Zhao Jiuye;Chang Jun
Ye'elimite（C_4A_3）是硫铝酸钙（CSA）水泥中的主要物相。为了改善CSA水泥的性能，可以用Sr ~（2+）取代C_4A_3中的Ca ~（2+）离子，合成含Sr的叶蜡石。在这项研究中，我们进行了晶体学分析的Sr轴承ye'elimite（C4− xŠxA 3 $）与0.25-3.00摩尔Sr 2+离子合成。研究了锶取代对叶利米石晶体结构的影响。用Rietveld法测定了含锶伊利石的晶格常数和熟料组成。结果表明，强取代促进了ye'elimite由正交晶系向立方晶系的转变。当锶取代量超过1.25mol.含Sr的ye'elimite在晶相中的量超过95wt%，而含Sr的ye'elimite的熟料中的杂质含有少量的铝酸钙相。无论立方晶系还是正交晶系，含Sr的ye'elimite的晶格参数都随强取代度的增加而线性增长。钙、锶均匀分布在含锶伊利石颗粒中。
Ye’elimite (C4A3$) is the main phase in calcium sulfoaluminate (CSA) cement. To improve the performance of CSA cement, substitutions of Ca2+by Sr2+cations in C4A3$ can be done to synthesize Sr-bearing ye’elimite. In this study we performed crystallographic analysis of Sr-bearing ye’elimite (C4−xŠxA3$) synthesized with 0.25–3.00 mol Sr2+ions. The effect of strontic substitutions on the crystal structure of ye’elimite was investigated. Compositions of clinkers and the lattice parameters of Sr-bearing ye’elimite were determined by the Rietveld method. Results showed that strontic substitutions promoted the transformation of the crystal system from orthorhombic to cubic for ye’elimite. Sr-bearing ye’elimite almost purely exists in a cubic structure when amounts of strontic substitutions exceed 1.25 mol. The amount of Sr-bearing ye’elimite in crystalline phases is over 95 wt% while impurities in the clinkers of Sr-bearing ye’elimite contain minor amounts of calcium aluminate phases. Lattice parameters of Sr-bearing ye’elimite exhibit linear growth with strontic substitutions increasing for both cubic and orthorhombic systems. Both calcium and strontium evenly distribute in the particles of Sr-bearing ye’elimite.