The SrO-Cr{sub 2}O{sub 3}-La{sub 2}O{sub 3} phase diagram and volatility of La{sub 1{minus}x}Sr{sub x}CrO{sub 3} (x = 0--0.3) in comparison to Cr base interconnect alloys

Book · Sun Dec 31 04:00:00 EST 1995

OSTI ID:242541

Peck, D H; Miller, M; Nickel, H; Das, D; Hilpert, K ^[1]

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1. Research Centre Juelich (Germany). Inst. for Materials in Energy Systems

The thermodynamic properties and volatility of SOFC materials is an important aspect in order to guarantee the necessary long term operation of an SOFC. Contributions to the SrO-Cr{sub 2}O{sub 3}-La{sub 2}O{sub 3} phase diagram were experimentally determined for the reducing and oxidizing conditions present in SOFCs. Moreover, the vaporization of La{sub 1{minus}x}Sr{sub x}CrO{sub 3} was elucidated by the use of Knudsen effusion mass spectrometry. The results obtained were used in the evaluation of the thermochemical properties of this phase and of its volatility. The latter is compared with that of Cr base interconnect alloys. Degradation mechanisms due to Cr vaporization are discussed. Moreover, the results are employed for the prediction of the SrCO{sub 3} formation in La{sub 1{minus}x}Sr{sub x}CrO{sub 3} in the presence of CO{sub 2} containing fuel gas.

• OSTI ID: 242541
• Report Number(s): CONF-950683--; ISBN 1-56677-095-5
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
36 MATERIALS SCIENCE
CHEMICAL COMPOSITION
CHROMIUM BASE ALLOYS
CHROMIUM OXIDES
COMPARATIVE EVALUATIONS
CONNECTORS
EVAPORATION
EXPERIMENTAL DATA
LANTHANUM OXIDES
MATERIALS
PHASE DIAGRAMS
SOLID ELECTROLYTE FUEL CELLS
STRONTIUM OXIDES
THERMODYNAMIC PROPERTIES
VOLATILITY