MASS SPECTROMETRIC STUDY OF THE EVAPORATION OF BaMoO4 AND BaWO4 (1).

Abstract

Mass spectrometric studies indicate that barium molybdate and barium tungstate salts evaporate mainly molecular BaMoO4(g) and BaWO4(g), 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: BaMoO4(g) = BaO(g) + MoO3(g), Delta-H = 129.7 plus or minus 4.0; BaMoO3(g) = BaO(g) + MoO2(g), Delta-H = 132.2 plus or minus 6.0; BaWO4(g) = BaO(g) + WO3(g), Delta-H = 148.3 plus or minus 4kcal. The heats of vaporization of BaMoO4(l) at 2000K are 83.5 and 93.7 plus or minus 4 kcal/mole, respectively. (Author)

Document Details

Document Type
Technical Report
Publication Date
Oct 23, 1968
Accession Number
AD0677008

Entities

People

  • C. Pupp
  • R. Yamdagni
  • Richard F. Porter

Organizations

  • Cornell University Department of Chemistry and Chemical Biology

Tags

DTIC Thesaurus Topics

  • Dissociation
  • Energy
  • Evaporation
  • Fragmentation
  • Heat Energy
  • Intensity
  • Mass Spectrometers
  • Measurement
  • Measuring Instruments
  • Molybdates
  • Spectrometers
  • Tungstates
  • Vaporization

Readers

  • Combustion science or combustion engineering.
  • Materials Science and Engineering.