THE DENSITY OF SODIUM BOROSILICATE GLASSES IN RELATION TO THE MICROSTRUCTURE

被引：32

作者：

DOWEIDAR, H ^{[1
]}

机构：

[1] MANSOURA UNIV,FAC SCI,DEPT PHYS,MANSOURA 35516,EGYPT

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 1992年 / 53卷 / 06期

关键词：

SODIUM BOROSILICATE GLASSES; DENSITY; MICROHARDNESS;

D O I：

10.1016/0022-3697(92)90194-I

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The density and microhardness of Na2O-B2O3-SiO2 glasses have been studied for R less-than-or-equal-to 0.5. (R = molar ratio of Na2O to B2O3). Compared with SiO2 and sodium borate glasses, the sodium borosilicate glasses are compressed. The compression is partially attributed to a reduction in the volume of the SiO4 tetrahedra but mainly to a decrease in the volume of the BO4 tetrahedra. The microhardness increases linearly with the density in two regions; with a higher rate for R < 0.2 and with a lower rate for R > 0.2. The results are discussed based on the change in the volumes of the SiO4, BO3 and BO4 units.

引用

页码：807 / 814

页数：8

共 18 条

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