A Thermodynamic and Spectroscopic Study of Gaseous Magnesium Oxide
- 1 November 1954
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 22 (11) , 1867-1877
- https://doi.org/10.1063/1.1739934
Abstract
Vapor pressure measurements on solid magnesium oxide show that the solid vaporizes mainly into molecular species. Spectroscopic experiments have been conducted and have shown that the known gaseous 1Σ electronic state of MgO is not the principal vaporizing species. A study of the ultraviolet bands, produced originally by magnesium burning in air, proves the lower electronic level of the molecule involved in this transition is more important than the 1Σ state of MgO. Within experimental uncertainty the heat of sublimation obtained from vapor pressure measurements agrees with a spectroscopically determined heat of sublimation of the molecule involved in the ultraviolet transition. The ultraviolet bands are shown to originate from a gaseous monomer of MgO. The vapor pressure of MgO at 2200°K is 3.8×10—4 atmos, and the vapor pressure over MgO reaches 1 atmos at 3040±60°K. The D0 value for MgO gas is 4.7 ev.Keywords
This publication has 12 references indexed in Scilit:
- Thermodynamic Properties of the Oxides and their Vaporization Processes.Chemical Reviews, 1953
- FORBIDDEN TRANSITIONS IN DIATOMIC MOLECULES: II. THE ABSORPTION BANDS OF THE OXYGEN MOLECULECanadian Journal of Physics, 1952
- The Gaseous Species of the Al-Al2O3 System1,2,3Journal of the American Chemical Society, 1951
- The Evaporation Products of Barium Oxide from Various Base Metals and of Strontium Oxide from PlatinumJournal of Applied Physics, 1951
- Theoretical Calculation of the Stability of Solid and Gaseous Alkali and Alkaline Earth Oxides2Journal of the American Chemical Society, 1951
- Thermochemical dissociation energies of gaseous calcium, strontium and barium oxidesTransactions of the Faraday Society, 1951
- A note on the spectrum of MgOProceedings of the Physical Society, 1945
- Heats of Formation of MgO, MgCl2, MgCl2·H2O, MgCl2·2H2O, MgCl2·4H2O, and MgCl2·6H2O1Journal of the American Chemical Society, 1943
- A study of the vapour pressures of magnesium, thallium, and zinc, and the determination of their chemical constantsPhilosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1935
- Dampfdruckmessungen an hochsiedenden MetallenHelvetica Chimica Acta, 1934