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A mass spectrometric study of Al 2 O 3 ‐SiO 2 melts using a Knudsen cell
Author(s) -
Björkvall Johan,
Stolyarova Valentina L.
Publication year - 2001
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.251
Subject(s) - knudsen number , materials science , analytical chemistry (journal) , thermodynamics , chemistry , physics , environmental chemistry
The thermodynamic activities of SiO 2 in Al 2 O 3 ‐SiO 2 liquid slags were measured by the high‐temperature Knudsen cell mass spectromeric method in the present work. The measurements were carried out in the temperature range 1863–2169 K. Tungsten crucibles were used to hold the slags. The system was calibrated using a CaF 2 standard. The mass spectra obtained for pure SiO 2 were in agreement with earlier data. The activities of silica, measured in the present work at 2150 K, show a slight negative deviation at very low alumina mole fractions which changed to a positive deviation at higher alumina contents. The activity values are in reasonable agreement with the assessment carried out by Hillert et al. The results were analysed on the basis of a slag model developed earlier at KTH, Stockholm. The present results are found to be compatible with the phase diagram proposed by Klug et al. Copyright © 2001 John Wiley & Sons, Ltd.