High-temperature mechanical behavior of the solid-state electrolyte: La{sub 0.8}Sr{sub 0.2}Ga{sub 0.85}Mg{sub 0.15}O{sub 2.825}
The creep behavior of fine-grained La{sub 0.8}Sr{sub 0.2}Ga{sub 0.85}Mg{sub 0.15}O{sub 2.825} (LSGM-2015) was investigated over the temperature range 1,200 to 1,300 C in air. The brief creep transients, value of the stress exponent close to unity, absence of deformation-induced dislocations, and lack of grain-shape change due to deformation suggest that the creep behavior of LSGM-2015 is controlled by grain boundary sliding accommodated by diffusion. The value of the grain-size exponent close to two indicates that the rate-controlling step is lattice diffusion. A comparison of the activation energy for creep with activation energies determined by ionic conductivity, oxygen tracer diffusion, and theoretical predictions reveal that the creep rate of LSGM-2015 is controlled by cation lattice diffusion.
- Research Organization:
- Army Research Lab., Adelphia, MD (US)
- OSTI ID:
- 20080561
- Journal Information:
- Journal of the Electrochemical Society, Vol. 147, Issue 5; Other Information: PBD: May 2000; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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