MgO-Al2O3-SiO2-TiO2-Y2O3玻璃的弹性模量

根据硬盘基板用材料的要求，制备了MgO-Al2O3-SiO2-TiO2-Y2O3高弹性模量玻璃（120GPa)，玻璃的弹性模量随组成的变化服从Makishima-Mackenzie理论，MgO,Al2O3,TiO2,Y2O3等具有较高单位体积离解能的氧化物有利于提高玻璃的弹性模量，但玻璃弹性模量的理论计算值低于测试值，这是因为Makishima-Mackenzie理论没有考虑玻璃内阳离子的具体配位，对MgO,Y2O3堆积密度因子的堆导存在误差，因此利用Makishima-Mackenzie理论发展高弹性模量玻璃时应对MgO,Y2O3等氧化物的计算进行修正。

Elastic Moduli of MgO-Al2O3-SiO2-TiO2-Y2O3 Glass

MgO-Al2O3-SiO2-TiO2-Y2O3 glasses with high elastic moduli were prepared for the substrates of hard disks. The elastic moduli of glasses change with their compositions according to Makishima-Mackenzie theory. The oxides with big dissociation energies per unit volume, such as MgO, Al2O3, TiO2 and Y2O3, are beneficial to the elastic moduli of glasses. The elastic moduli calculated by means of Makishima-Mackenzie theory, however, are lower than the measured data, the deviation can be attributed to the pretermission of the coordination structures of cation ions in glasses, and the packing volume factors of MgO and Y2O3 are not accurately dealt with, so the calculated elastic moduli of the glasses containing MgO and Y2O3 should be corrected.