Studies on cobalt-containing and nickel-containing glasses

JSGT 1959 V43 T405-T416

This paper deals with the investigation of several coloured glasses of cobalt and nickel by magneto-chemical and x-ray methods of analysis with the object of elucidating the role of the colouring constituent in the glass structure. The glass base was mainly alkali-boric oxide with varying amounts of alkali but a few silicate and ternary borate glasses were used. The following aspects of the problem are discussed: (1) the influence of glass composition on the state of the colouring oxide, (2) the relationship between the concentration of the colouring oxide and its state in the glassy matrix, (3) the effect of duration and temperature of heating on the state of the colouring oxide in the glass structure, and (4) the possible role of colouring constituent in the glass structure. The various theories about the origin of colour in glass are discussed in this paper. The present observations are interpreted in terms of the colour produced by solution of the metallic ion. It is deduced from measurements of magnetic properties at low temperatures that the binding in the cobalt tetrahedral and octahedral complexes is ionic.

Bhupati Kumar Banerjee