The influence of compositional variables on the thermodynamic properties of lanthanum strontium ferrite manganites and lanthanum strontium manganites

Journal Article · Tue Jul 01 00:00:00 EDT 1997 · Materials Research Bulletin

DOI:https://doi.org/10.1016/S0025-5408(97)00054-8· OSTI ID:514728

Tanasescu, S; Totir, N D; Marchidan, D I; Turcanu, A ^[1]

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1. Inst. of Physical Chemistry, Bucharest (Romania)

In order to obtain a better understanding of the stability limits of perovskite phases used in new SOFC (solid oxide fuel cell) cathodes materials, a study of the thermodynamic properties of some perovskite-type oxides based on lanthanum strontium ferrite manganite and lanthanum strontium manganite was initiated. For the determination of thermodynamic quantities, a solid state electrochemical technique has been employed. The relative partial molar free energies, enthalpies, and entropies of oxygen dissolution in the perovskite phase, as well as the partial pressures of oxygen, have been obtained in the temperature range of 1,073--1,273 K. The results evidence the influence of different compositional variables on the thermodynamic properties.

• Sponsoring Organization: Commission of the European Communities, Brussels (Belgium)
• OSTI ID: 514728
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 7 Vol. 32; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
36 MATERIALS SCIENCE
CATHODES
IRON OXIDES
LANTHANUM OXIDES
MANGANESE OXIDES
SOLID ELECTROLYTE FUEL CELLS
STRONTIUM OXIDES
TEMPERATURE RANGE 1000-4000 K
THERMODYNAMIC PROPERTIES