Enhanced molybdenum erosion under argon ion bombardment at elevated temperature.
Published: 2005
Language: eng
Number of pages: 38
Description: Between 1800 K and 2100 K, an exponential increase of erosion rate was observed in all Ar+ energy cases. However, it was only clearly discernible above 2000 K. The enhancements at 2050K were similar for all three energies within experimental error.The erosion of molybdenum was measured during Ar+  ion irradiation for temperatures 300 to 2100 K, and ion energies 200, 500 and 1000 eV. A microbalance was used to measure the mass of the specimen before and after Ar+ irradiation, and the mass change so obtained was compared with the mass change obtained when the same specimen was subject to heating only for the same period of time.Based on an Arrhenius plot of the results, the derived activation energy for Mo atom release from the surface under Ar+ bombardment is 4.3 +/- 0.6 eV, which is significantly lower than the literature value of 6.82 eV for Mo evaporation, indicating the presence of a possible erosion enhancement process.
Notes: Source: Masters Abstracts International, Volume: 44-02, page: 0953.

Thesis (M.A.Sc.)--University of Toronto, 2005.

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