摘要
采用传统熔融冷却法制备了CaO-Al2O3-SiO2-AlF3(A系列)和CaO-Al2O3-SiO2-CaF2(C系列)系统玻璃,在其组成范围SiO2>45mol%、Ca/Al>1(mol)、F/Al<1(mol)内,利用Doweidar密度模型在CaO-Al2O3-SiO2-F系统玻璃A系列和C系列中分别得到AlO3F四面体的体积,其值可认为是一常数VAl-f=57.82×10-24cm-3,与引入氟的形式(CaF2或AlF3)和化学计量浓度的改变无关;AlO4四面体的体积大于AlO3F四面体体积(VAl-f>VAl-o),分析认为这与质点间的键力发生改变有关(fAl-f<fAl-0),键力越小,质点间的距离越大,使VAl-f变大。由此模型得到的CaO-Al2O3-SiO2-F玻璃理论计算密度值与实际测量密度值基本相符,误差小于0.03%。
CaO-Al2O3-SiO2-AlF3 （series A） and CaO-Al2O3-SiO2-CaF2 （series C） glasses were prepared by means of conventional melt quenching technology. When SiO2〉45mol%, Ca/Al〉1（mol）, F/Al〈1（mol）, we got the value of the volume of AlO3F tetrahedron from series A and series C of CaO-Al2O3-SiO2-F system glasses by using Doweidar Density Model which can be regarded as a constant VAl-t=57.82×10^24cm-3 and without relation to the dopant （CaF2 or AlF3） and stoichiometric concentration. It is also found that the volu me of [AlO3F] tetrahedron is bigger than [AlO4] tetrahedron （VAt-t〉VAt-o）; the reason is that the bonding force at the mass point was changed （fAt-t 〈f N-o）. The smaller the bonding force, the bigger the distance between mass points. There was a satisfactory agreement between the calculated densities and the measured densities of CaO-Al2O3-SiO2 system glasses with the error less than 0.03%.
出处
《陶瓷学报》
CAS
北大核心
2010年第1期82-86,共5页
Journal of Ceramics
