酸化鐵を含む硝子に就て (第7報)

抄録

The following are studies made with influences of arsenious oxide added into glass batches.
(1) The color variation, the state of oxidation of iron oxide, and the transmission curves have been studied of soda-lime-iron oxide-silica glass by taking up several batches of said glass whose iron oxide content is about 2%, increasing therein gradually the amount of arsenious oxide ranging from 0.5% to 6%
(2) It has been observed that as the centent of arsenious oxide in the batches increases the color of the glass slightly intensifies its yellowish tone, and as to the oxidation of the iron oxide in the glasses it shows no variation as is seen from the following table: -
(3) Judged from the ratio of FeO/FeO+Fe₂O₃ contained in the glasses it is understood that arsenious oxide is more powerful oxidizing agent than sodium nitrate.
(4) The transmission curves of these glasses have been investigated by taking up specimens of said glasses having thickness of about 1mm.
These curves intersect each other substantially at 500-510mμ.
(5) Next, it is known that the shortest wavelength that transmits the glass moves toward longer wave lengthes as the content of arsenious oxide increases, and at the same time the transmission at 700mμ. becomes higher.