Thermal excitation contribution into the electromechanical performance of self-supported Gd-doped ceria membranes

• Published in: IOP conference series. Materials Science and Engineering Vol. 256; no. 1; pp. 12008 - 12013
• Main Authors: Ushakov, A D, Mishuk, E, Alikin, D O, Slautin, B N, Esin, A A, Baturin, I S, Shur, V Ya, Lubomirsky, I, Kholkin, A L
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.10.2017
• Subjects: Aluminum; Cerium oxides; Electric contacts; Electric fields; Electrode materials; Electrostriction; Excitation; Gadolinium; Membranes; Ohmic dissipation; Resistance heating; Titanium
• ISSN: 1757-8981; 1757-899X
• DOI: 10.1088/1757-899X/256/1/012008

Here we present the results of the study of electromechanical performance of the Ce0.8Gd0.2O1.95 (CGO) self-supported thin circular membranes with aluminum and titanium as contact electrode materials. The electromechanical performance of both membranes was investigated using highly sensitive interferometric technique and showed two principal excitations mechanisms: common electrostriction and thermal contribution due to the Joule heating. Operating the membranes at frequencies about MHz results in significant contribution of the thermal excitation due to a large power dissipation for every electrode. The excitation of the membrane with aluminum electrodes at the frequencies about 1 Hz leads to the formation of the Schottky barrier at the interface with CGO. That is why the electromechanical response was almost independent on frequency and electric field. Membrane with titanium electrodes showed a prevalence of electrostriction effect with weak frequency dispersion and significant enhancement of the response with temperature.