Dynamic chemical expansion of thin-film non-stoichiometric oxides at extreme temperatures
Author(s)
Smith, James F.; Swallow, Jessica Gabrielle; Kim, Jae Jin; Maloney, John; Chen, Di; Bishop, Sean; Tuller, Harry L; Van Vliet, Krystyn J; ... Show more Show less![Thumbnail](/bitstream/handle/1721.1/112638/Dynamic%20chemical%20with%20SI.pdf.jpg?sequence=12&isAllowed=y)
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Actuator operation in increasingly extreme and remote conditions requires materials that reliably sense and actuate at elevated temperatures, and over a range of gas environments. Design of such materials will rely on high-temperature, high-resolution approaches for characterizing material actuation in situ. Here, we demonstrate a novel type of high-temperature, low-voltage electromechanical oxide actuator based on the model material Pr[subscript x]Ce[subscript 1−x]O[subscript 2−δ] (PCO). Chemical strain and interfacial stress resulted from electrochemically pumping oxygen into or out of PCO films, leading to measurable film volume changes due to chemical expansion. At 650 °C, nanometre-scale displacement and strain of >0.1% were achieved with electrical bias values <0.1 V, low compared to piezoelectrically driven actuators, with strain amplified fivefold by stress-induced structural deflection. This operando measurement of films ‘breathing’ at second-scale temporal resolution also enabled detailed identification of the controlling kinetics of this response, and can be extended to other electrochemomechanically coupled oxide films at extreme temperatures.
Date issued
2017-05Department
MIT Materials Research Laboratory; Massachusetts Institute of Technology. Department of Materials Science and EngineeringJournal
Nature Materials
Publisher
Springer Nature
Citation
Swallow, Jessica G. et al. “Dynamic Chemical Expansion of Thin-Film Non-Stoichiometric Oxides at Extreme Temperatures.” Nature Materials (May 2017): 4898 © 2017 Macmillan Publishers Limited, part of Springer Nature
Version: Author's final manuscript
ISSN
1476-1122
1476-4660