Room temperature phase transition in CeO2 nanocrystalline films

Anna Kossoy; Jaya P. Nair; Ellen Wachtel; Igor Lubomirsky; Juergen Fleig; Joachim Maier

doi:10.1007/s10832-004-5165-0

Room temperature phase transition in CeO₂ nanocrystalline films

Anna Kossoy, Jaya P. Nair, Ellen Wachtel, Igor Lubomirsky, Juergen Fleig, Joachim Maier

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

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.

Original language	English
Pages (from-to)	605-608
Number of pages	4
Journal	Journal of Electroceramics
Volume	13
Issue number	1-3
DOIs	https://doi.org/10.1007/s10832-004-5165-0
State	Published - Jul 2004
Externally published	Yes

Bibliographical note

Funding Information:
The authors wish to acknowledge the Israel Ministry of Science, the Israeli Science Foundation and The German Federal Ministry of the Environment/Nature conservation and nuclear safety (BMU) for funding this research. I.L. is the incumbent of the Helen and Milton Kimmelman Career Development Chair.

Keywords

Cerium oxide
Diffusion
Mechanical stress
Nanocrystalline ceramics

Access to Document

10.1007/s10832-004-5165-0

Cite this

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title = "Room temperature phase transition in CeO2 nanocrystalline films",

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 {{\AA}} 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 {\AA} 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.",

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note = "Funding Information: The authors wish to acknowledge the Israel Ministry of Science, the Israeli Science Foundation and The German Federal Ministry of the Environment/Nature conservation and nuclear safety (BMU) for funding this research. I.L. is the incumbent of the Helen and Milton Kimmelman Career Development Chair.",

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AU - Lubomirsky, Igor

AU - Fleig, Juergen

AU - Maier, Joachim

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KW - Mechanical stress

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