Structure and properties of calcium aluminosilicate glasses
Structure and properties of calcium aluminosilicate glasses
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DOI：
10.1016/0022-3093(91)90468-l
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发表时间：
1991-05
影响因子：
3.5
通讯作者：
C. Huang;E. Behrman
中科院分区：
文献类型：
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作者：
C. Huang;E. Behrman
一段时间以来，铝在碱金属硅酸盐玻璃中的结构作用一直是人们感兴趣的问题。尽管有这种兴趣，但这个问题仍然没有解决。相应的碱土金属玻璃的研究要少得多，虽然它是可能的，这两个家庭的玻璃的相似性和不同之处的理解将提供一些照明的结构和行为的碱金属硅酸盐。在此，在该方向上采取了一个步骤，系统地研究了一系列铝硅酸钙（Al 2 O 3：0-39摩尔%; SiO 2：10-75摩尔%; CaO：13-65摩尔%）作为组成的函数的性质和光谱。密度，折射率和微观结构的测量结果。没有观察到突然的变化，在密度或折射率作为Al 2 O3的摩尔比CaO的函数。这可能意味着铝离子仅在钙铝硅酸盐玻璃中是四重配位的。最小值的氧的摩尔体积出现在较低的二氧化硅含量的Al 2 O3 CaO的比例增加。TEM研究显示相分离。FTIR光谱表明，非桥氧的量增加的量过量的石灰。同样，没有发现明显的证据表明存在六重配位铝离子。
The structural role of aluminum in alkali silicate glasses has been a question of interest for some time. In spite of this interest, the question remains an unsettled one. The corresponding alkaline earth glasses have been much less studied, although it is probable that an understanding of the similarities and dissimilarities of these two families of glasses will provide some illumination of the structure and behavior of the alkali silicates. Here, a step is taken in this direction with a systematic study of the properties and spectra of a series of calcium aluminosilicates (Al2O3: 0–39 mol%; SiO2: 10–75 mol%; CaO: 13–65 mol%) as functions of composition. Results of measurements of density, refractive index, and microstructure are presented. No abrupt changes are observed in density or refractive index as functions of the molar ratio of Al2O3to CaO. This may mean that aluminum ions are four-fold coordinated only in calcium aluminosilicate glasses. Minima in the molar volume of oxygen appear at lower silica content as the ratio of Al2O3to CaO increases. TEM studies showed phase separation. FTIR spectra showed that the amount of non-bridging oxygens increased with the amount of excess lime. Again, no apparent evidence was found for the existence of six-fold coordinated aluminum ions.