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

Cite this

@article{83b39c2a704a45d58c2361d3858efda5,
title = "Instability of supercritical porosity in highly doped ceria under reduced oxygen partial pressure",
abstract = "The thermomechanical behavior and microstructural evolution of low relative density (∼0.40) gadolinium-doped ceria are characterized underoxidative and reducing conditions at high temperatures. The electronic defects generated in the structure by Ce4+ to Ce3+ reduction play an importantrole on all mass diffusion phenomena, including densification and grain growth. Thermodynamically stable porosity (supercritical porosity) isdominant for isothermal sintering treatments in air. Conversely, the facilitated diffusion of ions through the lattice in reducing conditions results in anearly full densification.{\circledC} 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.",
keywords = "Gadolinium-doped ceria, Sintering, Densification, Reducing atmosphere",
author = "Francesca Teocoli and Ni, {De Wei} and Vincenzo Esposito",
year = "2015",
doi = "10.1016/j.scriptamat.2014.08.030",
language = "English",
volume = "94",
pages = "13--16",
journal = "Scripta Materialia",
issn = "1359-6462",
publisher = "Pergamon Press",

}

Instability of supercritical porosity in highly doped ceria under reduced oxygen partial pressure. / Teocoli, Francesca; Ni, De Wei; Esposito, Vincenzo.

In: Scripta Materialia, Vol. 94, 2015, p. 13-16.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Instability of supercritical porosity in highly doped ceria under reduced oxygen partial pressure

AU - Teocoli, Francesca

AU - Ni, De Wei

AU - Esposito, Vincenzo

PY - 2015

Y1 - 2015

N2 - The thermomechanical behavior and microstructural evolution of low relative density (∼0.40) gadolinium-doped ceria are characterized underoxidative and reducing conditions at high temperatures. The electronic defects generated in the structure by Ce4+ to Ce3+ reduction play an importantrole on all mass diffusion phenomena, including densification and grain growth. Thermodynamically stable porosity (supercritical porosity) isdominant for isothermal sintering treatments in air. Conversely, the facilitated diffusion of ions through the lattice in reducing conditions results in anearly full densification.© 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

AB - The thermomechanical behavior and microstructural evolution of low relative density (∼0.40) gadolinium-doped ceria are characterized underoxidative and reducing conditions at high temperatures. The electronic defects generated in the structure by Ce4+ to Ce3+ reduction play an importantrole on all mass diffusion phenomena, including densification and grain growth. Thermodynamically stable porosity (supercritical porosity) isdominant for isothermal sintering treatments in air. Conversely, the facilitated diffusion of ions through the lattice in reducing conditions results in anearly full densification.© 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

KW - Gadolinium-doped ceria

KW - Sintering

KW - Densification

KW - Reducing atmosphere

U2 - 10.1016/j.scriptamat.2014.08.030

DO - 10.1016/j.scriptamat.2014.08.030

M3 - Journal article

VL - 94

SP - 13

EP - 16

JO - Scripta Materialia

JF - Scripta Materialia

SN - 1359-6462

ER -