Microstructure and electrical conductivity of fast fired Sr- and Mg-doped lanthanum gallate |
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| Affiliation: | 1. Department of Civil, Chemical and Environmental Engineering (DICCA), University of Genoa P.le J.F. Kennedy 1, I-16129 Genova, Italy;2. CNRS, Université de Bordeaux, ICMCB, 87 Avenue du Dr. Schweitzer, F-33608 Pessac Cedex, France;3. Institute of Condensed Matter Chemistry and Technology for Energy (CNR-ICMATE), Via De Marini 6, I-16149 Genova, Italy;1. Building Energy and Environment Laboratory, School of Architecture, Guangzhou Municipal Key Laboratory of Landscape Architecture, State Key Lab of Subtropical Building Science, South China University of Technology, Wushan Road, Tianhe District, Guangzhou 510641, PR China;2. Building Technology and Urban Systems Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA;3. School of Chemistry and Chemical Engineering, South China University of Technology, Wushan Road, Tianhe District, Guangzhou 510641, PR China;1. School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, PR China;2. Faculty of Chemistry, Northeast Normal University, Changchun 130024, PR China;1. Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, María de Luna 3, E-50018 Zaragoza, Spain;2. Departamento de Física & I3N, Universidade de Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal;3. Dpto. De Física de la Materia Condensada, Facultad de Física, Universidad de Sevilla, Avenida de Reina Mercedes s/n, E-41012, Sevilla, Spain;1. Instituto de Ciencias de la Construcción Eduardo Torroja (IETCC-CSIC), C/Serrano Galvache 4, 28033 Madrid, Spain;2. Instituto de Estructura de la Materia (IEM-CSIC), C/Serrano 121, 28006 Madrid, Spain;3. Instituto de Geociencias (IGEO-CSIC, UCM), C/Doctor Severo Ochoa 7, 28040 Madrid, Spain |
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| Abstract: | La0.9Sr0.1Ga0.8Mg0.2O3?δ solid electrolytes were consolidated by fast firing aiming to investigate the effects of the sintering method on densification, microstructure and ionic conductivity. Powder mixtures were prepared by solid state reaction at 1250 and 1350 °C for 12 h, and fast fired at 1450 and 1500 °C temperatures for 5 and 10 min. The content of impurity phases was found to be quite low with this sintering method. Relatively high density (>90% of the theoretical value) and low porosity (<1.5%) were readily obtained for powder mixtures calcined at 1250 °C. The activation energy for conduction was approximately 1 eV. Specimens fast fired at 1450 °C for 10 min with a mean grain size of 2.26 µm reached the highest value of total ionic conductivity, 22 mS cm?1, at 600 °C. |
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| Keywords: | A: Sintering C: Electrical conductivity D: Perovskites E: Fuel cells |
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