GLASSES CONTAINING IRON OXIDE, XV

Abstract

The present paper deals with the investigations upon the density of the alkali-lime-silica glasses, in which the increasing amount of lime is replaced by ironoxide.The results of experiments have shown no remarkable difference of density between the soda-and potash-glasses and a little increase of density in the lithia-glass, in which the increasing amount of lime has been replaced by ferric oxide, while they have also shown the steady increase of density of the glasses, in which the increasing amount of lime has been replaced by ferrous oxalate, especially the appreciable increase of density in the lithia-lime-silica glass.Using the factors for density: SiO2=2.2, Al2O3=2.75, CaO=5, Na2O=3.47, given by English and Turner, and Fe2O3=4.8, given by English, Howes, Turner, and Winks, the following factors were obtained from the results of analysis of the series of colored glasses already published by the author: K2O=2.88, Li2O=3.16, and Fe2O3=4.8, FeO=7 for soda-and potash-glasses, Fe2O3=6, FeO=8 for lithia-glasses, where the relation between the percentages of the oxides, factors for density and the density of glass is as followis: S/D=pl/dl+p2/d2+………As shown in the following table, the densities calculated by these factors are in good agreement with those obtained by measurements.TableAlso in the series of glasses, FAN-B2, FAN-C3, FC, FAK-B2, and FAK-C3, the densities calculated by these factors have been found to be in good agreement with those obtained by measurements.