酸化鐵を含む硝子に就て (第8報)

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The following study has been made with the case in which sugar is added as a reducing agent to a glass batch containing iron oxide and an observation has been given to how the sugar works its influence upon the rate of oxidation of the iron oxide in said glass.(A) Into a soda-lime-silica glass batch in which 2% of the lime has been replaced by equal amount of iron oxide added, as a reducing agent, sugar by increasing gradually the amounts from 1% to 5%, and the variation of oxidation of the iron oxide contained in the resultant glass.(1) The amount of sugar added to the glass batches, variation of iron oxide in the glasses produced, and variation of the colour of glasses are tabled as follows:It is seen that the colour of the glasses gradually tends to the greenish with the increase in amount of sugar added until it reaches dark greenish brown, while the percentage ratio of FeO/FeO+Fe2O3 decreases as the amount of sugar increases.(2) Transmission curves have investigated with samples of these glasses having both sides thereof polished.It is shown that the total transmission is lowered with increase in amount of the sugar added, the maximum transmission wave length being shifting toward the longer wave. It is also seen that the transmission curve in the ultra-violet region is well resembled to that of the carbon coloured glass. On the other hand the shortest wave length transmitting the glass advances toward the shorter wave length as the amount of sugar added is increased. However, in glasses to which much sugar have been added the total transmission have been too small and accordingly to make any exact measurement as to the shortest wave length that transmits these glasses has been unabled.(B) By keeping constant the amount of sugar added to the glass batches as a reducing agent the iron oxide content in glass composition has been increased.(1) The lime contents in soda-lime-silica glasses and potash-lime-silica glasses have been replaced by iron oxide one by one, and the respective batches have been melted by adding the reto 0.5% of sugar. The following table shows variation of the oxidation of iron oxide and the glass colour produced.It has been seen that the variation of FeO/FeO+Fe2O3 in the glasses gradually goes higher until the ironoxide content in the glasses reaches 1%, but it rather tends declining when the content be over 1%. This may be due to that the amount of the reducing agent remains constant in spite of amounts of iron oxide in glasses are increased. As regards the colour, the soda glasses change from greenish-yellow to bluish with an increase in the iron-oxide contents, while in potash glasses they change from yellow to bluish-green.(2) Respective transmission curves have been sought from samples of these glasses having both sides polished. In glasses small amount of iron-oxide contained the short wave length transmitting the glasses has been found little, due to the reducing agent, but in those having much of iron oxide contained it has been found that there is substantially no difference with the shortest wave length that transmits the glasses containing no reducing agent, due to the shortness of said agent.

酸化鐵を含む硝子に就て (第8報)

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