Prediction and evaluation of sintering aids for Cerium Gadolinium Oxide

Jason D. Nicholas, Lutgard C. De Jonghe

Research output: Research - peer-reviewArticle

  • 135 Citations

Abstract

This paper presents dilatometry results for Ce0.9Gd0.1O1.95, a common intermediate temperature solid oxide fuel cell electrolyte material, doped at the 1, 3, and 5 mol% level using nitrates. The results indicate that across all dopant nitrate levels, Cu, Co, Fe, Mn, Li, and Zn reduce the Ce0.9Gd0.1O1.95 sintering temperature, while Ca, Mg, and Ni have little effect, and Al and K increase the sintering temperature. These results can be interpreted in terms of a Vegard's Slope quality factor analysis which uses a dopant's charge and size to rank its propensity to heterogeneous dope the material and/or segregate to the grain boundary as a separate phase. Further, this work shows that Ce0.9Gd0.1O1.95 can be sintered to 99% density at a record-low temperature of 800 °C, using as little as 3 mol% lithium as a dopant.

LanguageEnglish (US)
Pages1187-1194
Number of pages8
JournalSolid State Ionics
Volume178
Issue number19-20
DOIs
StatePublished - Jul 15 2007
Externally publishedYes

Profile

gadolinium
cerium
sintering
oxides
evaluation
predictions
temperature
Gadolinium
Cerium
Sintering
Oxides
Temperature
gadolinium oxide
Doping (additives)
nitrates
Nitrates
dilatometry
factor analysis
solid oxide fuel cells
Q factors

Keywords

  • CeO
  • Ceria
  • CGO
  • Densification
  • Dopant
  • Electrolyte
  • Fuel cell
  • GDC
  • Grain boundary engineering
  • Heterogeneous doping
  • Liquid phase sintering
  • Low temperature
  • Sintering
  • Undersized
  • Vegard's Slope

ASJC Scopus subject areas

  • Electrochemistry
  • Physical and Theoretical Chemistry
  • Energy Engineering and Power Technology
  • Materials Chemistry
  • Condensed Matter Physics

Cite this

Prediction and evaluation of sintering aids for Cerium Gadolinium Oxide. / Nicholas, Jason D.; De Jonghe, Lutgard C.

In: Solid State Ionics, Vol. 178, No. 19-20, 15.07.2007, p. 1187-1194.

Research output: Research - peer-reviewArticle

Nicholas, Jason D. ; De Jonghe, Lutgard C./ Prediction and evaluation of sintering aids for Cerium Gadolinium Oxide. In: Solid State Ionics. 2007 ; Vol. 178, No. 19-20. pp. 1187-1194
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AB - This paper presents dilatometry results for Ce0.9Gd0.1O1.95, a common intermediate temperature solid oxide fuel cell electrolyte material, doped at the 1, 3, and 5 mol% level using nitrates. The results indicate that across all dopant nitrate levels, Cu, Co, Fe, Mn, Li, and Zn reduce the Ce0.9Gd0.1O1.95 sintering temperature, while Ca, Mg, and Ni have little effect, and Al and K increase the sintering temperature. These results can be interpreted in terms of a Vegard's Slope quality factor analysis which uses a dopant's charge and size to rank its propensity to heterogeneous dope the material and/or segregate to the grain boundary as a separate phase. Further, this work shows that Ce0.9Gd0.1O1.95 can be sintered to 99% density at a record-low temperature of 800 °C, using as little as 3 mol% lithium as a dopant.

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