Anomalous Expansion of CeO2 Nanocrystalline Membranes

Anomalous Expansion of CeO2 Nanocrystalline Membranes

Nanocrystalline, nominally undoped films of CeO2–x undergo large (0.8–2 %) lateral expansion after local substrate removal and formation of freestanding membranes (see Figure). The structural, optical, and electrical properties are consistent with the hypothesis that substrate removal triggers disor...

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Veröffentlicht in:Advanced materials (Weinheim) 2003-12, Vol.15 (24), p.2077-2081
Hauptverfasser: Nair, J.P., Wachtel, E., Lubomirsky, I., Fleig, J., Maier, J.
Format: Artikel
Sprache:eng
Schlagworte:
Cerium oxide
Conductivity
Conductivity, ionic
ionic
Phase transitions
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Zusammenfassung:Nanocrystalline, nominally undoped films of CeO2–x undergo large (0.8–2 %) lateral expansion after local substrate removal and formation of freestanding membranes (see Figure). The structural, optical, and electrical properties are consistent with the hypothesis that substrate removal triggers disordering of oxygen vacancies leading to this expansion, which occurs irrespective of whether tensile or compressive stress existed in the films.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.200305549