Dynamic chemical expansion of thin-film non-stoichiometric oxides at extreme temperatures
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Micro Materials Ltd., Wrexham (United Kingdom)
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. In this work, we demonstrate a novel type of high-temperature, low-voltage electromechanical oxide actuator based on the model material PrxCe1-xO2-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. Finally, 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.
- Research Organization:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Oak Ridge Associated Univ., Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
- Grant/Contract Number:
- SC0002633; AC05-06OR23100
- OSTI ID:
- 1535074
- Journal Information:
- Nature Materials, Vol. 16, Issue 7; ISSN 1476-1122
- Publisher:
- Springer Nature - Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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