Electrical conductivity of nanostructured acceptor-doped ceria fabricated by Spark Plasma Sintering (SPS)

Ahsanul Kabir, Sofie Colding-Jørgensen, Sebastian Molin, Vincenzo Esposito*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

High purity nanoscale powders (∼10-15 nm size) of two different compositions of ceria, doped with Gd3+ and Ca2+, have been consolidated by spark plasma sintering (SPS) at different temperatures. Fully-dense samples were observed only at a sintering temperature of 980 °C. The as-sintered samples showed rather fast grain growth with an average grain size below 300 nm. The electrical properties of the samples were evaluated by impedance spectroscopy over a wide range of temperatures (300-550 °C) in air. Electrical conductivity significantly enhanced with increasing sintering temperature. The compounds show an electrical blocking effect at the grain boundary, depending on the doping cations.
Original languageEnglish
Article number128513
JournalMaterials Letters
Volume279
ISSN0167-577X
DOIs
Publication statusPublished - 2020

Keywords

  • Acceptor doped ceria
  • Spark plasma sintering
  • microstructure
  • Ionic conductivity

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