Abstract

Excess heat capacities at glass transition temperature in two types of glass-forming systems of [xNaNO3·(1−x)KNO3]60·[Ca(NO3)2]40 (0 ⩽ x ⩽ 1) and Ca(NO3)2·yH2O (4⩽y⩽13) are studied. In the former system, with the replacement of K+ cation with Na+ cation, the excess heat capacity is around 65.1 J·mol−1·K−1, while the excess increases by 38.9 J·mol−1·K−1 upon one molar H2O content in latter system. A quantitative description to the excess heat capacity is built up with the thermal effects of atomic and molecular translational motion in liquids. The results might offer a further understanding to the glass transition.

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