Instability of supercritical porosity in highly doped ceria under reduced oxygen partial pressure

Francesca Teocoli, De Wei Ni, Vincenzo Esposito

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The thermomechanical behavior and microstructural evolution of low relative density (∼0.40) gadolinium-doped ceria are characterized under
oxidative and reducing conditions at high temperatures. The electronic defects generated in the structure by Ce4+ to Ce3+ reduction play an important
role on all mass diffusion phenomena, including densification and grain growth. Thermodynamically stable porosity (supercritical porosity) is
dominant for isothermal sintering treatments in air. Conversely, the facilitated diffusion of ions through the lattice in reducing conditions results in a
nearly full densification.
© 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Original languageEnglish
JournalScripta Materialia
Volume94
Pages (from-to)13-16
ISSN1359-6462
DOIs
Publication statusPublished - 2015

Keywords

  • Gadolinium-doped ceria
  • Sintering
  • Densification
  • Reducing atmosphere

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