Abstract
We have studied the specific heat of nitrate glasses (T G changes upon admixing. The excess specific heat is found to be inversely proportional to T G . Similar results have been observed on silica containing sodium and on neutron-irradiated silica, for which the important parameter is the fictive temperature T f . It is concluded that the frozen-in disorder in the glass, which is measured by T G (or T f ), is an important factor in determining the density of states of low-energy excitations which are characteristic of the amorphous state.
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