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XPS STUDIES OF OXIDATION BEHAVIOR OF NICKEL AND THERMAL STABILITY OF SURFACE OXIDES |
ZHAO Liangzhong;PAN Chenghuang Institute of Chemistry. Academia Sinica; Beijing |
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Cite this article:
ZHAO Liangzhong;PAN Chenghuang Institute of Chemistry. Academia Sinica; Beijing. XPS STUDIES OF OXIDATION BEHAVIOR OF NICKEL AND THERMAL STABILITY OF SURFACE OXIDES. Acta Metall Sin, 1988, 24(5): 431-435.
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Abstract Surface oxidation of polycrystalline nickel foil in air and purewater at different temperatures and the thermal stability of the surface oxides havebeen investigated by means of XPS. In addition to NiO, Ni_2O_3 is formed especiallyafter long periods of air exposure. Nickel surfaces are much less reactive to purewater than to air. The thermal stability of the surface oxides is related to oxidativetemperature. The surface species of oxides formed by air exposure at temperaturesbelow 120℃ can be reduced into nickel metal after heating the sample in vacuumat 300℃ for only 10 minutes (in the case of room temperature) to 1 hour (in thecase of 120℃). This reduction is caused by reaction with surface carbon contami-nants. However, the surface species of nickel oxides formed by air exposure withheating at temperatures above 200℃ can not be reduced into metal after heatingthe sample in vacuum at 300℃ for 1 hour.
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Received: 18 May 1988
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