THERMODYNAMIC INVESTIGATION OF THE VAPORIZATION OF SOLID POLY CRYSTALLINE ALUMINA WITH KNUDSEN EFFUSION MASS SPECTROMETRY

摘要

In our studies of the corrosion of polycrystalline alumina the vaporization behavior of Al_2O_3 was investigated by Knudsen Effusion Mass Spectrometry (KEMS). Even though the alumina vaporization has been studied extensively, there are discrepancies: (a) among the data derived using KEMS, and (b) between data recommended in database (e.g. JANAF and IVTANTHERMO) and those obtained by mass spectrometric studies. New thermodynamic data for the species AlO(g) and Al_2O(g) have been derived and compared with those available in the literature. The consistency of the data in the present study are ascertained by deriving the thermodynamic data for Al_2O_3(s).