Electrical characterization of La9.33Si2Ge4O26 oxyapatite for prospective intermediate-temperature solid oxide fuel cells |
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| Affiliation: | 1. Department of Mechanical Engineering, University of Western Macedonia, 50100 Kozani, Greece;2. Department of Chemical Engineering, Aristotle University of Thessaloniki, Building E13, 54124 Thessaloniki, Greece;3. Chemical Process & Energy Resources Institute, Centre for Research & Technology Hellas, 57001, Thermi, Thessaloniki, Greece;4. Department of Environmental Engineering, University of Western Macedonia, 50100 Kozani, Greece;5. Department of Chemistry, Centre for Materials Science and Nanotechnology, University of Oslo, FERMiO, Gaustadalleen 21, NO-0349 Oslo, Norway;6. Instituto Nacional del Carbon, Apartado 73, 33080 Oviedo, Spain;7. School of Production Engineering and Management, Technical University of Crete, GR-73100 Chania, Crete, Greece;1. College of Resources and Environment, Jilin Agricultural University, Changchun 130118, PR China;2. College of Chemistry, Jilin University, Changchun 130012, PR China |
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| Abstract: | La9.33Si2Ge4O26 materials have been fabricated from La2O3, SiO2 and GeO2 powders by high speed mechanical alloying followed by conventional and microwave hybrid sintering at different temperatures and holding times. XRD data showed that the apatite phase is formed after 1 h of mechanical alloying at 850 rpm. This phase remained stable after conventional sintering in an electric furnace with density increasing as sintering temperatures and holding times were increased. However, the highest density was achieved for samples sintered in the microwave furnace (5.44 g cm?3), corresponding to a relative density of 98%. The electrical conductivity of the samples microwave sintered at 700 and 800 ºC are 4.72×10?3 and 1.93×10?2 S.cm?1, respectively, with a correspondent activation energy of 0.952 eV. |
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| Keywords: | Apatite-type electrolyte SOFC Mechanical alloying Impedance spectroscopy Electrical properties |
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