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Title: 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}

Abstract

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.

Authors:
; ;
Publication Date:
Research Org.:
Army Research Lab., Adelphia, MD (US)
OSTI Identifier:
20080561
Resource Type:
Journal Article
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 147; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 0013-4651
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 30 DIRECT ENERGY CONVERSION; LANTHANUM OXIDES; STRONTIUM OXIDES; GALLIUM OXIDES; MAGNESIUM OXIDES; MECHANICAL PROPERTIES; SOLID OXIDE FUEL CELLS; SOLID ELECTROLYTES

Citation Formats

Wolfenstine, J., Huang, P., and Petric, A. 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}. United States: N. p., 2000. Web. doi:10.1149/1.1393415.
Wolfenstine, J., Huang, P., & Petric, A. 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}. United States. doi:10.1149/1.1393415.
Wolfenstine, J., Huang, P., and Petric, A. Mon . "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}". United States. doi:10.1149/1.1393415.
@article{osti_20080561,
title = {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}},
author = {Wolfenstine, J. and Huang, P. and Petric, A.},
abstractNote = {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.},
doi = {10.1149/1.1393415},
journal = {Journal of the Electrochemical Society},
issn = {0013-4651},
number = 5,
volume = 147,
place = {United States},
year = {2000},
month = {5}
}