In cerium oxide coatings, I have found that there are excess lattice oxygen when oxygen to metal ratio is quite high. Does it mean that the coatings have higher surface energy when there is excess lattice oxygen
There is an excellent paper by Campbell on essentially this issue:
Phys. Rev. Lett., Vol. 96, 066106 (2006)
https://depts.washington.edu/chem/people/faculty/documents/campbell/ThinfilmoxidesPRL.pdf
When an oxide layer forms on the metal surface, the adhesion energy at the interface provides extra stabilization.
Dear Prof. Sohlberg,
Thank you for your invaluable feedback.
Regards,
Kabir
How did you "measure" the excess of oxygen? When measured by XPS, an excess of oxygen may be related (and, usually, it is) with the existence of hydroxyl groups at the extreme surface.
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