Effect of oxygen defects blocking barriers on gadolinium doped ceria (GDC) electro-chemo-mechanical properties
| Autor: | Ngo Van Nong, Robin Nigon, Simone Santucci, Paul Muralt, Ahsanul Kabir, Igor Lubomirsky, Maxim Varenik, Vincenzo Esposito |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Polymers and Plastics FOS: Physical sciences Spark plasma sintering Sintering chemistry.chemical_element Electrostriction gadolinium-doped ceria 02 engineering and technology ionic-conductivity size 01 natural sciences Oxygen Physics - Chemical Physics 0103 physical sciences Gadolinium-doped ceria Vacancies Chemical Physics (physics.chem-ph) 010302 applied physics Condensed Matter - Materials Science sintering Dopant sm Metals and Alloys Materials Science (cond-mat.mtrl-sci) vacancies 021001 nanoscience & nanotechnology electrostriction Grain size Electronic Optical and Magnetic Materials Chemical engineering chemistry oxides Ceramics and Composites Crystallite space-charge 0210 nano-technology zirconia grain-boundaries |
| Zdroj: | Kabir, A, Santucci, S, Van Nong, N, Varenik, M, Lubomirsky, I, Nigon, R, Muralt, P & Esposito, V 2019, ' Effect of oxygen defects blocking barriers on gadolinium doped ceria (GDC) electro-chemo-mechanical properties ', Acta Materialia, vol. 174, pp. 53-60 . https://doi.org/10.1016/j.actamat.2019.05.009 Acta Materialia |
| ISSN: | 1359-6454 |
| Popis: | Some oxygen defective metal oxides, such as cerium and bismuth oxides, have recently shown exceptional electrostrictive properties that are even superior to the best performing lead-based electrostrictors, e.g. lead-magnesium-niobates (PMN). Compared to piezoelectric ceramics, electromechanical mechanisms of such materials do not depend on crystalline symmetry but on the concentration of oxygen vacancy (V-(O) over dot ) in the lattice. In this work, we investigate for the first time the role of oxygen defects configuration on the electro-chemo-mechanical properties. This is achieved by tuning the oxygen defects blocking barrier density in polycrystalline gadolinium doped ceria with known oxygen vacancy concentration, Ce0.9Gd0.1O2-delta, delta = 0.05. Nanometric starting powders of ca. similar to 12 nm are sintered in different conditions, including field assisted spark plasma sintering (SPS), fast firing and conventional method at high temperatures. These approaches allow controlling grain size and Gd-dopant diffusion, i.e. via thermally driven solute drag mechanism. By correlating the electro-chemo-mechanical properties, we show that oxygen vacancy distribution in the materials plays a key role in ceria electrostriction, overcoming the expected contributions from grain size and dopant concentration. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. |
| Databáze: | OpenAIRE |
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