Anomalous Chemical Expansion Behavior of Pr0.2Ce0.8O2-δThin Films Grown by Pulsed Laser Deposition | Zendy

Yener Kuru | Zendy; Dario Marrocchelli | Zendy; Sean R. Bishop | Zendy; Di Chen | Zendy; Bilge Yildiz | Zendy; Harry L. Tuller | Zendy

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Anomalous Chemical Expansion Behavior of Pr_0.2Ce_0.8O_2-δThin Films Grown by Pulsed Laser Deposition

Author(s) -

Yener Kuru,

Dario Marrocchelli,

Sean R. Bishop,

Di Chen,

Bilge Yildiz,

Harry L. Tuller

Publication year - 2012

Publication title -

journal of the electrochemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.258

H-Index - 271

eISSN - 1945-7111

pISSN - 0013-4651

DOI - 10.1149/2.016212jes

Subject(s) - metastability , diffraction , perovskite (structure) , thin film , materials science , pulsed laser deposition , deposition (geology) , spectroscopy , analytical chemistry (journal) , chemical physics , chemistry , crystallography , nanotechnology , optics , paleontology , organic chemistry , sediment , physics , chromatography , quantum mechanics , biology

The chemomechanical and electrical properties of (Pr,Ce)O[subscript 2-δ] thin films were studied between 30 and 875°C in air by in situ X-ray diffraction and complex impedance spectroscopy measurements. Reduction/oxidation reactions produced large stress variations (∼2 GPa) in the structure. Atomistic simulation techniques were employed to investigate the mechanisms behind the observed chemical expansion behavior, suggesting the possible roles of defect ordering upon cooling and heating. An alternative explanation based on a metastable frozen in state of higher reduction is also considered. Similar phenonena, observed here in Pr[subscript 0.2]Ce[subscript 0.8]O[subscript 2-δ], are expected to be applicable and of potential significance for other technologically important complex oxides such as perovskite-structured materials.United States. Dept. of Energy. Office of Basic Energy Sciences (Award DE SC0002633)MIT Energy Initiative (Seed Fund Program

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