[Zurück]

A. Kossay, J. Nair, E. Wachtel, I. Lubomirsky, J. Fleig, J. Maier:
"Room Temperature Phase Transition in CeO₂ Nanocrystalline Films";
Journal of Electroceramics, 13 (2004), 1-3; S. 605 - 608.

The temporal evolution of the lattice parameter of oxygen deficient nanocrystalline cerium oxide films was monitored by X-ray diffraction. It was found that films with lattice parameter of 5.47 {Å} upon deposition undergo large spontaneous expansion, in which the size of the unit cell increases by 0.7% during the course of days. The films with as-deposited lattice parameter larger or smaller than 5.47 Å do not show significant changes. This behavior is consistent with the previously suggested hypothesis of an order-disorder transition of oxygen vacancies and can be viewed as its direct experimental confirmation.

http://dx.doi.org/10.1007/s10832-004-5165-0