Low-temperature densification of lanthanum strontium manganite (La 1-xSrxMnO3+δ), x=0.0-0.20

Benjamin P. McCarthy, Larry R. Pederson, Ralph E. Williford, Xiao Dong Zhou

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Intermediate-stage sintering of lanthanum strontium manganite (LSM, where Sr=0.00, 0.05, 0.10, 0.15, and 0.20) was shown in dilatometry studies to be accelerated when subjected to alternating flows of air and nitrogen. The extent of rate enhancement decreased with increased Sr content, and decreased with increased temperature, which coincides with diminished oxygen nonstoichiometry. Shrinkage rates were further shown to be sensitive to the difference in oxygen content in the alternating gas flows. Baseline air sintering rates were measured using stepwise isothermal dilatometry, from which kinetic parameters were calculated using the Makipirtti-Meng model. Activation energies for sintering in air were determined to be 255 ± 26, 258 ± 28, 308 ± 32, 373 ± 37, and 417 ± 41 kJ/mol for Sr=0.0, 0.05, 0.10, 0.15, and 0.20, respectively. A diffusion-based model is proposed that is consistent with trends in accelerated shrinkage versus temperature. Transient cation vacancy gradients, which lead to higher cation mobility, were calculated from established oxygen diffusivities and oxygen nonstoichiometry as a function of temperature and time. A potential application of this approach is the processing of LSM-based cathode-side contact pastes in solid oxide fuel cells.

Original languageEnglish
Pages (from-to)1672-1678
Number of pages7
JournalJournal of the American Ceramic Society
Volume92
Issue number8
DOIs
Publication statusPublished - Aug 2009
Externally publishedYes

Fingerprint

Lanthanum
Strontium
strontium
Densification
Oxygen
oxygen
Sintering
air
cation
Cations
Air
Positive ions
temperature
fuel cell
gas flow
activation energy
Temperature
diffusivity
Ointments
Solid oxide fuel cells (SOFC)

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Low-temperature densification of lanthanum strontium manganite (La 1-xSrxMnO3+δ), x=0.0-0.20. / McCarthy, Benjamin P.; Pederson, Larry R.; Williford, Ralph E.; Zhou, Xiao Dong.

In: Journal of the American Ceramic Society, Vol. 92, No. 8, 08.2009, p. 1672-1678.

Research output: Contribution to journalArticle

McCarthy, Benjamin P. ; Pederson, Larry R. ; Williford, Ralph E. ; Zhou, Xiao Dong. / Low-temperature densification of lanthanum strontium manganite (La 1-xSrxMnO3+δ), x=0.0-0.20. In: Journal of the American Ceramic Society. 2009 ; Vol. 92, No. 8. pp. 1672-1678.
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