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Microstructure and Conductivity of La1−xSrxGa0.8Mg0.2O3− Electrolytes Prepared Using the Freeze-Drying Method

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Polycrystalline powders of La1−xSrxGa0.8Mg0.2O3− (LSGM) (x=0.05, 0.10, and 0.20) were synthesized using an alternative freeze-drying method. Precursors and sintered pellets of LSGM were characterized by X-ray diffraction and scanning electron microscopy, paying special attention to the temperature dependence of phase formation and microstructure evolution. The results of this study indicate that dense LSGM samples with a low level of Sr doping x≤0.1 can be prepared as a single phase at 1300°C, although a temperature of 1400°C is required for samples with a higher Sr content (x>0.1). The phase formation and densification processes take place in a short time due to the small particle size and the low degree of agglomeration of the synthesized powders. Dense samples of La0.8Sr0.2Ga0.8Mg0.2O3− without secondary phases are obtained after sintering at 1400°C for only 15 min with ionic conductivity values of 0.1 S/cm at 800°C.
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Document Type: Research Article

Affiliations: 1: Laboratorio de Materiales y Superficies (Unidad Asociada al C.S.I.C.), Dpto. de Física Aplicada I, Universidad de Málaga, 29071 Málaga, Spain 2: Dpto. de Química Inorgánica, Universidad Málaga, 29071 Málaga, Spain 3: Instituto de Energías Renovables, Parque Tecnológico, Universidad de Castilla La Mancha, 02006 Albacete, Spain 4: Dpto. de Química Inorgánica, Universidad de La Laguna, 38200 La Laguna, Tenerife, Spain

Publication date: 2011-04-01

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