The Transformation Range in Glass

JSGT 1948 V32 T301-T308

The transformation range is discussed with particular reference to glycerol and boric-oxide glasses. It is concluded that glasses at temperatures below the melting points of their crystalline forms have specific heat, specific volume and viscosity values quite continuous with those of the liquid state, but that even with infinite time the excess specific heat of the glass over that of the crystal must steadily fall with fall in temperature much below the transformation range. An indication is given of the probable trend of the volume–temperature curve for stabilised glasses below the transformation range.

J. E. Stanworth