Change in the work function of zirconium by oxidation at high temperatures and low oxygen pressures

Changes in the work function of Zr on oxidation are measured at O pressures of 3.0 x 10 exp --6 to 3.0 x 10 exp --4 Pa and at temperatures in th erange 426-775K. The work function first decreases then increases until a final saturation stage is reached. Use of secondary-ion mass spectroscopy (SIMS)...

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Bibliographic Details
Published in:Journal of the Chemical Society. Faraday transactions 1991, Vol.87 (9), p.1399-1403
Main Authors: Maeno, Yutaka, Yamamoto, Masahiro, Naito, Shizuo, Mabuchi, Mahito, Hashino, Tomoyasu
Format: Article
Language:English
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Summary:Changes in the work function of Zr on oxidation are measured at O pressures of 3.0 x 10 exp --6 to 3.0 x 10 exp --4 Pa and at temperatures in th erange 426-775K. The work function first decreases then increases until a final saturation stage is reached. Use of secondary-ion mass spectroscopy (SIMS) shows that the changes correspond to O adsorption, oxide nucleation and oxide growth, respectivley. The initial decrease in work function is interpreted by the incorporation of O adatoms into the subsurface. The O adsorption potential of Zr is evaluated by an effective medium theory, and the physical origin of the incorporation of O adatoms is discussed. The positive change in the work function caused by oxide formation and the temperature and pressure dependences of the change in the work function by oxidation are explained qualitatively. Graphs. 34 ref.--AA
ISSN:0956-5000
1364-5455
DOI:10.1039/ft9918701399