Compressive creep performance of SrFeO3

Citation
K. Kleveland et al., Compressive creep performance of SrFeO3, J AM CERAM, 84(8), 2001, pp. 1822-1826
Citations number
21
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
ISSN journal
00027820 → ACNP
Volume
84
Issue
8
Year of publication
2001
Pages
1822 - 1826
Database
ISI
SICI code
0002-7820(200108)84:8<1822:CCPOS>2.0.ZU;2-Q
Abstract
Compressive creep performance of strontium-deficient and strontium-excess S rFeO3-delta materials has been investigated in the temperature range 800 de grees -1000 degreesC and in the stress range 2.5-25 MPa. The absolute densi ties of the strontium-deficient and strontium-excess materials are 4.99 and 5.25 g/cm(3), respectively, which corresponds to porosities of similar to2 % and 5%, respectively. Both materials contain secondary phases because of the cation nonstoichiometry. The creep rate is faster for the strontium-def icient material than the strontium-excess material. The stress exponent is approximately unity, and the activation energy is 260 +/- 30 kJ/mol for bot h materials. The results can be explained by a cation diffusion mechanism. The present findings are discussed in relation to previous sintering data a nd the possible application of these materials as oxygen-permeable membrane s.