酸化鐵を含む硝子に就て (第13報)

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It is the object of this paper to set out a brief summary of the past work on the series of glasses which have been prepared from the batch mixtures in which the increasing amount of lime has been replaced by ferric-oxide or by ferrous-oxalate respectively.As the results of the total analysis of the series of lithiumoxide glasses have already been presented in the 10th and 12th report, only those of the soda-and potash-glasses is given in the following table.Table.The degree of dissociation of ironoxide contained in the glass, the percentage ratio (FeO/FeO+Fe2O3) x 100, varies with the increase of ironoxide, if the melting-process, -time, -temperature, -quantity of the glass be almost constant, with no reference to the kind of raw materials from which the ironoxide has been introduced into the glass.Glasses containing ironoxide which has been introduced into the batch in the form of ferric-oxide present the decreasing dissociation tendency with the increasing amount of ironoxide and glasses prepared from the batch mixtures into which ironoxide has been introduced in the form of ferrous-oxalate show the increasing dissociation tendency with the increasing amount of ironoxide in the glass. It can be generally said that the said percentage ratio shows a very gradual variation at the range of over 4% of total iron oxide.The total transmission of each glass, calculated from the measured transmission curves, has been plotted in graph against the total ironoxide content of each glass.So far as the total ironoxide content is small, there has been found no appreciable distinction of the total transmission between the glasses into which the ironoxide has been introduced in the form of ferric-oxide and those into which the ironoxide has been introduced in the form of ferrous-oxalate.With the increase of ironoxide content the total transmission of the former glasses takes higher value than those of the latter.Comparing the distinction of the transmission between those glasses with reference to the alkali component, the potashglass shows the most remarkable distinction, the lithia-glass the moderate, and the soda-glass the least.The minimum wave length transmitting the latter glasses shows the smaller value so far as the total ironoxide content is small, and it presents the adverse results at the range of high ironoxide content, in consequence to the small transmission in the visible region.The transmission at 700mμ of the former glass and that of the latter glass presents no appreciable distinction between them, so far as the total ironoxide content is small and the transmission at 700mμ of the latter glass is less than that of the former at the range of higher ironoxide content.As to the color of the glasses, the former presents the color varying from yellowish green and the latter the bluish, so far as the total ironoxide content is small, and moreover, the former gives the color varying from brown to brownish green and the latter from dark green to dark greenish blue.

酸化鐵を含む硝子に就て (第13報)

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