Porous thick film lanthanum strontium ferrite stress and oxygen surface exchange bilayer curvature relaxation measurements

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Abstract

Here, the chemical oxygen surface exchange coefficient and film stress of porous La0.6Sr0.4FeO3-δ (LSF64) thick films were simultaneously measured in situ between 275-375°C and 275-700°C, respectively, using a bilayer curvature measurement technique. The magnitude and activation energy of the porous LSF64 thick film oxygen surface exchange coefficients were consistent with those from large grained, bulk samples. However, unlike large-grained, dilatometry-tested bulk LSF64 samples that only exhibited measurable chemical stress above 525°C, the fine-grained, curvature-tested porous LSF64 thick films studied here exhibited measurable chemical stress over the complete temperature range from 275 to 700°C. Further, the porous LSF64 thick films exhibited a kink in their Arrhenius chemical stress behavior (displaying activation energies of 0.07 eV below 525°C and 0.5 eV above 525°C), suggesting a distinct lattice-dominated chemical stress response above 525°C and a distinct grain-boundary-dominated chemical stress response below 525°C.

LanguageEnglish (US)
PagesF3025-F3031
JournalJournal of the Electrochemical Society
Volume161
Issue number11
DOIs
StatePublished - 2014

Profile

Lanthanum
Strontium
lanthanum
Thick films
strontium
thick films
Ferrite
ferrites
curvature
Oxygen
oxygen
Activation energy
activation energy
dilatometry
coefficients
Grain boundaries
grain boundaries

ASJC Scopus subject areas

  • Electrochemistry
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics

Cite this

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title = "Porous thick film lanthanum strontium ferrite stress and oxygen surface exchange bilayer curvature relaxation measurements",
abstract = "Here, the chemical oxygen surface exchange coefficient and film stress of porous La0.6Sr0.4FeO3-δ (LSF64) thick films were simultaneously measured in situ between 275-375°C and 275-700°C, respectively, using a bilayer curvature measurement technique. The magnitude and activation energy of the porous LSF64 thick film oxygen surface exchange coefficients were consistent with those from large grained, bulk samples. However, unlike large-grained, dilatometry-tested bulk LSF64 samples that only exhibited measurable chemical stress above 525°C, the fine-grained, curvature-tested porous LSF64 thick films studied here exhibited measurable chemical stress over the complete temperature range from 275 to 700°C. Further, the porous LSF64 thick films exhibited a kink in their Arrhenius chemical stress behavior (displaying activation energies of 0.07 eV below 525°C and 0.5 eV above 525°C), suggesting a distinct lattice-dominated chemical stress response above 525°C and a distinct grain-boundary-dominated chemical stress response below 525°C.",
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T1 - Porous thick film lanthanum strontium ferrite stress and oxygen surface exchange bilayer curvature relaxation measurements

AU - Yang,Qing

AU - Nicholas,Jason D.

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N2 - Here, the chemical oxygen surface exchange coefficient and film stress of porous La0.6Sr0.4FeO3-δ (LSF64) thick films were simultaneously measured in situ between 275-375°C and 275-700°C, respectively, using a bilayer curvature measurement technique. The magnitude and activation energy of the porous LSF64 thick film oxygen surface exchange coefficients were consistent with those from large grained, bulk samples. However, unlike large-grained, dilatometry-tested bulk LSF64 samples that only exhibited measurable chemical stress above 525°C, the fine-grained, curvature-tested porous LSF64 thick films studied here exhibited measurable chemical stress over the complete temperature range from 275 to 700°C. Further, the porous LSF64 thick films exhibited a kink in their Arrhenius chemical stress behavior (displaying activation energies of 0.07 eV below 525°C and 0.5 eV above 525°C), suggesting a distinct lattice-dominated chemical stress response above 525°C and a distinct grain-boundary-dominated chemical stress response below 525°C.

AB - Here, the chemical oxygen surface exchange coefficient and film stress of porous La0.6Sr0.4FeO3-δ (LSF64) thick films were simultaneously measured in situ between 275-375°C and 275-700°C, respectively, using a bilayer curvature measurement technique. The magnitude and activation energy of the porous LSF64 thick film oxygen surface exchange coefficients were consistent with those from large grained, bulk samples. However, unlike large-grained, dilatometry-tested bulk LSF64 samples that only exhibited measurable chemical stress above 525°C, the fine-grained, curvature-tested porous LSF64 thick films studied here exhibited measurable chemical stress over the complete temperature range from 275 to 700°C. Further, the porous LSF64 thick films exhibited a kink in their Arrhenius chemical stress behavior (displaying activation energies of 0.07 eV below 525°C and 0.5 eV above 525°C), suggesting a distinct lattice-dominated chemical stress response above 525°C and a distinct grain-boundary-dominated chemical stress response below 525°C.

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