High-temperature creep behavior of mixed conducting la0.5Sr 0.5Fe1-xCoxO3-8 (0.5 ≤ x ≤ 1) materials

Hilde Lea Lein, Kjell Wiik, Mari Ann Einarsrud, Tor Grande, Edgar Lara-Curzio

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

Steady-state compressive creep rate of La0.5Sr 0.5Fe0.5Co0.5O3-δ (LSFC) and La0.5Sr0.5Co3-δ(LSC) is reported in the temperature region 900°-1050°C and stress range 5-28 MPa. The stress exponents for the two materials were 1.71 ± 0.18 and 1.24 ± 0.15, respectively. The activation energy for creep was considerably higher for LSC (619±56 kJ/mol) than for LSFC (392 ± 28 kJ/mol). The grain size exponent for LSC was 1.28 ± 0.14. Considerably higher creep rates were observed for both materials in N2 compared with air. Relaxation by creep of chemical-induced stresses in oxygen-permeable membranes is addressed, especially at low partial pressure of oxygen.

Original languageEnglish
Pages (from-to)2895-2898
Number of pages4
JournalJournal of the American Ceramic Society
Volume89
Issue number9
DOIs
StatePublished - Sep 2006
Externally publishedYes

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