Constitution and Colour of Glasses Containing Iron and Manganese Oxides
JSGT 1935 V19 T208-T216
A spectroscopic study of glasses containing iron and manganese oxides, both separately and in conjunction, supported by a consideration of the colours produced by oxides and salts of manganese in aqueous, hydrochloric acid and vitreous solutions, as well as in solution in organic solvents, has led to the conclusions that (l) the proportion of the purple colouring Mn2O3in a manganese-containing glass increases with increasing concentration, but in any case is very small compared with that of the faintly colouring manganous oxide; (2) the Mn2O3 is very sensitive to the reducing action of FeO present; (3) glasses containing 2%iron oxide and manganese oxides up to 4 or 5% are relatively transparent to light by reason of the reduction of purple Mn2O3 by FeO to relatively colourless MnO, and the corresponding oxidation of bluish-green FeO to the golden-brown and more transparent Fe2O3 (4) in mixed iron and manganese oxide-containing glasses the ultimate colour depends on the total Fe2O3 and MnO present.
W. E. S. Turner & W. Weyl
