M P , Sridhar Kumar and B, Viswanathan and C. S , Swamy and V, Srinivasan (1989) Surface properties of CaNi 5 hydrogen storage alloy. Journal of Materials Science, 24 . pp. 4387-4391.
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Abstract
The Ca 2p, Ni 2p and O ls emissions of the air-exposed sample of CaNi 5 indicate that all the calcium and most of the nickel are present in the oxidized state. Interestingly, it is observed that all the peaks are shifted by 3 to 4eV towards higher binding energy values. This observation has been attributed to the presence of insulating oxide phases leading to partial charging of the sample during the experiment. Depth profiling by argon-ion sputtering removes the insulating oxide species and the sample etched for 7300sec shows the presence of metallic nickel and mostly metallic calcium. XPS analysis indicates that preferential segregation of calcium in the CaNi 5 alloy is mainly due to induced surface reaction with oxygen.
| Item Type: | Article |
|---|---|
| Subjects: | Q Science > QD Chemistry |
| ID Code: | 275 |
| Deposited By: | INVALID USER |
| Deposited On: | 01 Mar 2007 12:40 |
| Last Modified: | 19 Mar 2007 21:24 |
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