Differential high-temperature mass spectrometry was used to determine the activities of Bi 2 O 3 in Bi 2 O 3 -SiO 2 glasses at 1000 K. The activities of SiO 2 and integral Gibbs energies in Bi 2 O 3 -SiO 2 glasses were determined. Negative deviations from the ideal behavior were revealed in the studied system at 1000 K.
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Stolyarova et al. (2014) studied this question.
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