Elastic Moduli of MgO-Al2O3-SiO2-TiO2-Y2O3 Glass
MgO-Al2O3-SiO2-TiO2-Y2O3玻璃的弹性模量

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.