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The thermodynamical miscibility in 0.8[xB 2 O 3 –(1−x)P 2 O 5 ]–0.2K 2 O glasses has been studied by measuring the glass transition temperature and the mixing enthalpy. Measurements have been performed by differential scanning calorimeter and hydrofluoric acid solution calorimetry at 298K. The enthalpies of mixing are significantly negative over the whole range...
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