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Mechanical Properties of LSGM as an Electrolyte for Solid Oxide Fuel Cells

[+] Author Affiliations
Alidad Mohammadi, Alevtina L. Smirnova

University of Connecticut, Storrs, CT

Nigel M. Sammes

Colorado School of Mines, Golden, CO

Paper No. FuelCell2008-65151, pp. 61-64; 4 pages
doi:10.1115/FuelCell2008-65151
From:
  • ASME 2008 6th International Conference on Fuel Cell Science, Engineering and Technology
  • ASME 2008 6th International Conference on Fuel Cell Science, Engineering and Technology
  • Denver, Colorado, USA, June 16–18, 2008
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-4318-1 | eISBN: 0-7918-3822-6
  • Copyright © 2008 by ASME

abstract

Strontium- and magnesium-doped lanthanum gallate (LSGM) due to its high ionic conductivity and chemical stability over a wide range of oxygen partial pressures and temperatures has been considered as an alternative electrolyte for solid oxide fuel cell (SOFC) systems. Mechanical properties of LSGM electrolyte layer however need to be well studied. An overview of mechanical behavior of LSGM on an all-perovskite SOFC is presented in this work. Dense La0.8 Sr0.2 Ga0.7 Mg0.3 O2.8 electrolyte pellets were studied. Mechanical properties, such as hardness, elastic modulus, fracture toughness, and modulus of rupture (MOR) of the electrolyte pellets at different sintering temperatures were measured and correlated with the SEM morphological characterization. Samples sintered for 2h at 1500°C demonstrated slightly enhanced mechanical properties than those sintered at 1450°C and 1400°C.

Copyright © 2008 by ASME

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