MASS SPECTROMETRIC STUDY OF THE EVAPORATION OF BaMoO4 AND BaWO4 (1).
Final rept. 1 Feb 66-31 May 68,
CORNELL UNIV ITHACA N Y DEPT OF CHEMISTRY
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Mass spectrometric studies indicate that barium molybdate and barium tungstate salts evaporate mainly molecular BaMoO4g and BaWO4g, respectively. The importance of ion fragmentation processes occurring in the mass spectrometer were established from appearance potential measurements and the variations in relative ion intensities with condensed phase composition. Third-law calculations give for the dissociation reactions BaMoO4g BaOg MoO3g, Delta-H 129.7 plus or minus 4.0 BaMoO3g BaOg MoO2g, Delta-H 132.2 plus or minus 6.0 BaWO4g BaOg WO3g, Delta-H 148.3 plus or minus 4kcal. The heats of vaporization of BaMoO4l at 2000K are 83.5 and 93.7 plus or minus 4 kcalmole, respectively. Author
- Atomic and Molecular Physics and Spectroscopy