Mass Spectrometric Study of the Vaporization
and Thermodynamic Properties of Components
in the BaOTiO₂SiO₂ System

V. L. Stolyarova and S. I. Lopatin

Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences,
ul. Odoevskogo 24/2, St. Petersburg, 199155 Russia

Received April 2, 2004

Abstract—The activities of silicon dioxide and barium oxide in the BaO–TiO₂–SiO₂ system containing from
10 to 50 mol % SiO₂ at a mole fraction ratio BaO : TiO₂ = 1 and at a constant SiO₂ mole fraction of 0.5 are
determined using high-temperature differential mass spectrometry. It is shown that the positive deviation of the
SiO₂ activity and the negative deviation of the BaO activity from ideal behavior are observed at high SiO₂
contents.

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