Abstract
The mixing enthalpies in the 0.8[ xB 2O 3–(1 − x)SiO 2]–0.2K 2O glassy system with 0 ≤ x ≤ 1 have been deduced from accurate calorimetric measurements of solution enthalpies in acidic solvent at 298 K. The substitution of SiO 2 by B 2O 3 corresponds to a negative enthalpic effect and suggests the absence of some glassy miscibility gap. The mixing enthalpies are of the same order of magnitude as mixing enthalpies usually found in molten salts.
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