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Relationship among the powder mass, press charge, and final properties of an LSGM electrolyte for solid oxide cells

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Abstract

In this work, La0.85Sr0.15Ga0.85Mg0.15O3−δ (LSGM) was prepared as an electrolyte for solid oxide cell (SOC) applications. A fast combustion method was used, starting with nitrate salts and citric acid as fuel. Different parameters, such as mass and pressing load, in the pre-sintering step were used to obtain a highly ionic conductive material at intermediate temperatures. The aim is to find optimal processing conditions for energy savings. SEM analysis showed similar grain sizes and distributions for all samples. The XRD spectra showed two main phases corresponding to LSGM orthorhombic (space group Imma) and LSGM cubic (space group Pm-3m). LaSrGaO4 appeared in lighter samples. The EIS revealed that heavier samples present high conductivity, showing a clear relationship between conductivity, sample mass (during the pre-sintering step), and the LSGM phase amount. The effect of pressure was less evident. The highest conductivity was 0.013 and 0.063 S cm−1 at 600 and 800 °C, respectively.

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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgments

The authors acknowledge the financial support of FONDEF VIU (ANID) Project No.:22P0087. Government of Chile. The authors thank Mónica Uribe from Instituto de Geología Aplicada. UDEC; the Centro de Microscopía Avanzada.

Funding

The authors thank the Project: FONDEF VIU 22P0087 from the Agencia Nacional de Investigación y Desarrollo (ANID), Chile.

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Authors and Affiliations

  1. Electrochemical Technologies and Green Energies Laboratory, Department of Materials Engineering, Faculty of Engineering, University of Concepcion, Edmundo Larenas 315, Concepción, Chile

    Erwin Sepúlveda & Felipe Sanhueza

  2. Facultad de Ingeniería, Arquitectura y Diseño, Universidad San Sebastián, Lientur 1457, Concepción, Chile

    Erwin Sepúlveda

  3. Unidad de Admisión y Registro Académico Estudiantil, Dirección de Docencia, Universidad de Concepción, Edmundo Larenas 64, Concepción, Chile

    Ramón Cobo

  4. Materalia Group - Physical Metallurgy Department, National Centre for Metallurgical Research (CENIM-CSIC), Av. de Gregorio del Amo, 8, 28040, Madrid, Spain

    José Jiménez

  5. Faculty of Engineering and Sciences, Universidad Adolfo Ibáñez, Diagonal las Torres 2640, Peñalolén, Santiago, Chile

    Mangalaraja Ramalinga Viswanathan

Authors
  1. Erwin Sepúlveda
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  2. Felipe Sanhueza
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  3. Ramón Cobo
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  4. José Jiménez
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  5. Mangalaraja Ramalinga Viswanathan
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Contributions

ES contributed toward Full redaction, EIS analysis, and compilation. FS contributed toward characterization XRD, SEM. RC contributed toward morphology, size distribution, and graphs. JJ contributed toward XRD and Rietveld refinement. MRV contributed toward translation and final revision.

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Correspondence to Erwin Sepúlveda.

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Sepúlveda, E., Sanhueza, F., Cobo, R. et al. Relationship among the powder mass, press charge, and final properties of an LSGM electrolyte for solid oxide cells. MRS Advances (2024). https://doi.org/10.1557/s43580-024-00771-x

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