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Title: Dynamic chemical expansion of thin-film non-stoichiometric oxides at extreme temperatures

Journal Article · · Nature Materials
DOI:https://doi.org/10.1038/nmat4898· OSTI ID:1535074
 [1];  [1];  [1];  [1];  [2];  [1];  [1];  [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. 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
Citation Metrics:
Cited by: 37 works
Citation information provided by
Web of Science

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Cited By (6)

Anelastic and Electromechanical Properties of Doped and Reduced Ceria journal July 2018
In Situ Method Correlating Raman Vibrational Characteristics to Chemical Expansion via Oxygen Nonstoichiometry of Perovskite Thin Films journal June 2019
Electro‐chemomechanical Contribution to Mechanical Actuation in Gd‐Doped Ceria Membranes journal February 2019
A review on optical fiber sensors for environmental monitoring journal January 2018
The role of oxide interfaces in highly confined electronic and ionic conductors journal January 2019
Effect of Pr on the electrical and chemical properties of cerium oxide prepared by combustion method
  • Cruz‐Pacheco, Andrés F.; Gómez Cuaspud, Jairo A.; Parra Vargas, Carlos A.
  • International Journal of Applied Ceramic Technology, Vol. 16, Issue 6 https://doi.org/10.1111/ijac.13295
journal May 2019

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