GLASS CONTAINING IRON OXIDE, XIV

Abstract

A brief summary is given of past investigations on the series of glasses containing iron oxide which have been prepared from the batch mixtures containing the reducing agent, cane sugar, or the oxidizing agent, alkalinitrate, respectively.The results of the chemical analysis of these glasses are as follows:-The comparisons between the two series of glasses have been made of the percentage ratio FeO/FeO+Fe2O3 in the above table, of the total transmission from the transmission curves, of the limit transmitting ultra violet ray, and of the end of transmission of the red spectrum.The transmission curve in the infra red region of the glass which contains 1% total iron oxide as Fe2O3 and has been prepared from the batch with addition of oxidizing agent, is closely similar to that of the glass which contains 0.1% total ironoxide as Fe2O3 and has been prepared under reducing condition.The content of total iron oxide and the degree of oxidation of iron oxide are given in the following table:-From the results of experiments stated above the degree of the infra red ray absorption of glass rather chiefly depends upon the content of FeO than the content of total iron oxide.