酸化鐵を含む硝子に就て (第5報)

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In the soda-lime-iron oxide-silica glasses whose general glass composition is 72%SiO2, (12-x)% CaO, x% Fe2O3, 16% Na2O, the source of iron oxide has been used ferrous oxalate, gradually changing the value of the x from 0 to 12 one by one. In such case a study has been made as to the state of oxidation of the iron oxide, and of glass color as well as transmission curves and at same time made a comparison of these changes with FA-series described in the 3rd report.(A) An amount of FeO contained in the glass and an amount of total iron oxide as Fe2O3 have been obtained through analysis and the percentage ratio of FeO/FeO+Fe2O3 has been sought there from, which being as follows: -From this result it has been found that the percentage ratio of the FeO/FeO+Fe2O3 in all glasses except FD-1 and FD-2 will be greater as amounts of iron oxide go to increase but this tendency will cease at a certain limit, whence it will gradually approach a definite value. Next comparing the said percentage ratio of FeO/FeO+Fe2O3 with that of FA-series it has been noted that in this FD-series it will be increased as the iron content increases while in FA-series it will be contrary to the former.As to the colors, glasses having smaller iron content are bluish and the amounts of Fe and Fe2O3 increase with the increase of iron content, presenting greenish blue glasses. When the iron content is considerably increased it presents dark green color. Compared with glasses in FD-series the color of FA-series glasses are yellowish, and a comparison has been made between glasses having the same amount of iron content in both series and, in general, glasses in FD-series are deeper and darker than those in FA-series, with respect to the colors.(B) The transmission curves have been measured. It has been found that the transmission will be smaller as iron oxide content increases. The transmission curves of glasses in the FD-series have been compared with those of the glasses corresponding to glasses in FA-series. The maximum transmission range of glasses in FD-series has been found in the side where wave length is shorter and considerably lower.Furthermore, a comparison has been made as to the limit of wave length which transmit the glass, between glasses of both FA and FD-series. It has been known that among the glasses having smaller iron contents there is substantially no difference therebetween.However, as the iron content increases a difference will gradually arise between the two and glasses in FD-series transmit wave length shorter than that transmitted by FA-series glasses.As to the transmission in 700mμ the glasses in FD-series are lower than those in FA-series and the lowering degree is for greater than the difference in the visible range.

酸化鐵を含む硝子に就て (第5報)

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