RAMAN-SPECTROSCOPY OF CALCIUM ALUMINATE GLASSES AND CRYSTALS
RAMAN-SPECTROSCOPY OF CALCIUM ALUMINATE GLASSES AND CRYSTALS
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DOI：
10.1016/0022-3093(83)90672-5
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发表时间：
1983-01-01
影响因子：
3.5
通讯作者：
PIRIOU, B
中科院分区：
文献类型：
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作者：
MCMILLAN, P;PIRIOU, B
采用太阳炉熔炼和快淬技术制备了CaO浓度为75% ~ 82%的铝酸钙玻璃，并用拉曼光谱对其进行了研究。caal2o4玻璃光谱可以用四面体铝酸盐单元的完全聚合网络来解释，这种网络在加入CaO组分时解聚，类似于二元硅酸盐体系。氧化铝含量高于CaAl2O4的玻璃光谱不能简单解释，提出了一个与玻璃光谱和观察到的沿CaAl2O4al2o3连接的晶体结构相一致的结构模型。该模型表明，在初始添加氧化铝时，形成高度凝聚的铝酸盐四面体，氧化铝含量越高，平均配位越高的铝酸盐多面体的出现。类似的高配位多面体也被认为是沿CaOcaal2o4连接的有限组成范围。这些解释与先前在SiO2al2o3玻璃体系中的研究结果进行了比较。
Solar furnace melting and fast-quench techniques have been used to prepare calcium aluminate glasses from 75 mol% CaO to 82 mol% Al2O3, which have been studied by Raman spectroscopy. The CaAl2O4glass spectrum may be interpreted in terms of a fully-polymerized network of tetrahedral aluminate units, which is depolymerized on addition of CaO component analogous to binary silicate systems. The spectra of glasses with higher alumina content than CaAl2O4may not be simply interpreted and a structural model is proposed which would be consistent with the glass spectra and with observed crystal structures along the CaAl2O4Al2O3join. This model suggests formation of highly condensed aluminate tetrahedral on initial addition of alumina, with the appearance of aluminate polyhedra of higher average coordination at higher alumina content. Similar high coordination polyhedral are also suggested for a limited composition range along the CaOCaAl2O4join. These interpretations are compared with the results of a previous study in the SiO2Al2O3glass system.