Electrical and mechanical characterization by instrumented indentation technique of La0.85Sr0.15Ga0.8Mg0.2O3?δ electrolyte for SOFCs |
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| Authors: | Miguel Morales Joan Josep Roa José Manuel Pérez-Falcón Alberto Moure Jesús Tartaj Mercè Segarra |
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| Affiliation: | 1. Centre DIOPMA, Departament de Ciència dels Materials i Enginyeria Metal·lúrgica, Universitat de Barcelona, C/Martí i Franquès 1, 08028 Barcelona, Spain;2. Laboratoire de Physique des Matériaux, Université de Poitiers, Bd Pierre et Marie Curie, BP 30179, 86962 Futuroscope Chasseneuil Cedex, France;3. Instituto de Cerámica y Vidrio (CSIC) Kelsen 5, 28049 Cantoblanco, Madrid, Spain;1. Centro Atómico Constituyentes, Av. Gral Paz 1499, Buenos Aires, Argentina;2. CONICET-CNEA, Centro Atómico Bariloche, Av. Bustillo 9500, S.C. Bariloche, CP 8400, Argentina;1. Department of Chemical Engineering, Indian Institute of Technology Delhi, New Delhi 110016, India;2. Department of Chemistry, Indian Institute of Technology Delhi, New Delhi 110016, India;1. Faculty of Integrated Technologies, Universiti Brunei Darussalam, Gadong BE, 1410, Brunei Darussalam;2. HMC, Department of Nanotechnology and Advanced Materials Engineering, Sejong University, 209 Neungdong-ro, Gwangjin-gu, Seoul, 05006, Republic of Korea;3. Fuel Cell Institute, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia;1. Department of Process Engineering & Petrochemistry, University of El Oued, 39000 El Oued, Algeria;2. University of Málaga, Departament of Inorganic Chemistry, 29071 Málaga, Spain;3. Department of Matter Sciences, University of Biskra, 07000 Biskra, Algeria;4. University of Málaga, Departament of Applied Physics I, 29071 Málaga, Spain;1. National Engineering Laboratory for Vacuum Metallurgy, Kunming 650093, China;2. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China;3. Faculty of Environment Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China;4. Faculty of Physical Science and Technology, Yunnan University, Kunming 650091, China |
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| Abstract: | La0.85Sr0.15Ga0.8Mg0.2O3?δ pellets obtained by the polymeric organic complex solution method, isostatic pressing and sintering at 1350 °C have been electrical and mechanically studied. Electrical measurements evidenced reasonable ionic conductivities (0.01 S cm?1 at 800 °C), which were comparable to those reported for the La1?xSrxGa1?yMgyO3?δ prepared by other synthesis methods. On the other hand, the mechanical properties (elastic modulus, E and hardness, H) have been determined at micro/nanometric scale using the instrumented indentation technique. While E did not vary significantly with the increasing indentation depth (h), H values strongly decreased with the indentation depth up to 500 nm. For h > 500 nm, both mechanical properties remained almost constant, thus obtaining E = 271 ± 6 GPa and H = 13.2 ± 0.4 GPa. Finally, the residual imprints and fracture mechanisms have been observed by atomic force microscopy (AFM). |
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