酸化鐵を含む硝子に就て (第12報)
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The present paper deals with the study of the lithia-lime-silica glasses, in which the increasing amount of lime is replaced by ironoxide from ferrous oxalate.The glass melting was carried out with the glover electric furnace in the same way as already dealt with in the Xth report, the amunt of each melt being just 250g of glass.The results of the total analysis and the percentage ratio of FeO/FeO+Fe2O3 are set out in the following table.It must be noted from the above table that the content of alumina in these glasses is considerably high, owing to the violence of the action of lithia upon the refractory clay pot.Although the percentage ratio of FeO/FeO+Fe2O3 seems to be somewhat irregular, it increases with the increasing amount of ironoxide till 1% of total iron and at the range of over this amount of iron, it keeps almost the constant value in general.The transmission curves were determined for each sample of 1mm thickness.Also the total transmissions were determined from the said curves and were compared with those of the glasses FD in the Vth report and FDK in the XIth report respectively.From the abve table it may be generally said that there are no remarkable distinctions between the total transmission values of the three kinds of glasses at the range of less than 1% of ironoxide and at the range of over this amount there can be found the appreciable distinctions between them and also that the potash glass gives the best, the soda glass the moderate, and the lithia glass the least transmission respectively.The colour of the lithiumoxide glass varies with the increase of iron content and generally saying, what contains small amount of iron shows the faint bluish colour and with the increase of iron content the glasses of the colour varying from bluish to greenish or even dark bluish black opaque have been obtained.
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