Abstract
The oxidation of polycrystalline tungsten ribbons has been followed by mass spectrosmetry (MS), Auger electron spectroscopy (AES) and power loss measurement (thermal emissivity). AES and thermal emissivity as a function of coverage indicate a change in the growth mode at T ox = 1000 K. An attempt is made to correlate complex desorption spectra with thermal emissivity measurements at high temperature. A possible cause of the observed behaviour may be a change in the topography of the metal-oxide interface as evaporation proceeds.
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