Electromechanical properties of electrostrictive CeO2:Gd membranes: Effects of frequency and temperature


Doped ceria is known for decades as an excellent ionic conductor used ubiquitously in fuel cells and other devices. Recent discovery of a giant electrostriction effect has brought world-wide interest to this class of materials for actuation applications in micromechanical systems. From this aspect, the electromechanical response has to be studied as a function of external parameters, such as frequency, temperature, and electrode material. In this work, we fabricated circular membranes based on Gd-doped ceria (CGO) with Ti electrodes and studied their electromechanical response using a sensitive interferometric technique. The self-supported membranes are flat at room temperature and reversibly buckle upon heating, indicating that the membranes are under in-plane tensile strain. We have found that the electromechanical response is strongly frequency dependent. Significant hysteresis is observed in the displacement-vs.-voltage curves, which is deleterious for micromechanical applications but can be eliminated by tuning the phase of the excitation voltage. The electromechanical response of the system increases with temperature. Finite Element Modeling is applied to evaluate the electrostriction coefficient of the CGO material. At low frequencies, the M-12 electrostriction coefficient is about 5 x 10(-18) m(2)/V-2, which is in line with the previous reports. Published by AIP Publishing.



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Ushakov, AD; Mishuk, E; Makagon, E; Alikin, DO; Esin, AA; Baturin, IS; Tselev, A; Shur, VY; Lubomirsky, I; Kholkin, AL

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The equipment of the Ural Center for Shared Use "Modern Nanotechnology" UrFU was used. This research was made possible in part by RFBR (Grant No. 15-52-06006 MNTI_a). This work was supported by the Israeli Ministry of Science and Technology within the program of Israel-Russian Federation Scientific Collaboration, Grant No. 12421-3. A.L.K. and A.T. acknowledge the CICECO-Aveiro Institute of Materials POCI-01-0145-FEDER-007679 (Ref. FCT UID /CTM /50011/2013), financed by national funds through the FCT/MEC and when applicable co-financed by FEDER under the PT2020 Partnership Agreement. This work has been supported in part by the Ministry of Education and Science of the Russian Federation under Project No. 3.9534.2017/BP. We thank Mrs. Elena Pelegova for the help with the manuscript preparation.

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