Kossay, A., Nair, J. P., Wachtel, E., Lubomirsky, I., Fleig, J., & Maier, J. (2004). Room Temperature Phase Transition in CeO₂ Nanocrystalline Films. Journal of Electroceramics, 13(1–3), 605–608. https://doi.org/10.1007/s10832-004-5165-0
Electrical and Electronic Engineering; Mechanics of Materials; Condensed Matter Physics; Electronic, Optical and Magnetic Materials; Ceramics and Composites; Materials Chemistry
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Abstract:
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.
