Generation of electric-field stabilized zirconium monoxide secondary phase within cubic zirconia

Harry Charalambous, Shikhar Krishn Jha, John S. Okasinski, Thomas Tsakalakos

Research output: Contribution to journalArticle

Abstract

Flash sintering of cubic yttria-stabilized zirconia has been studied via in situ energy dispersive diffraction. A secondary rocksalt-phase zirconium monoxide was observed emerging from the primary fluorite-phase zirconium dioxide, previously only observed as a thin interlayer at metal-oxide interfaces, upon application of a direct current electric field. The average secondary phase intensity rose over extended flow of direct current through the ceramic, faded upon removal of the field and disappeared entirely upon application of an alternating current electric field. The results indicate that the sustained application of a direct current electric field can result in significant electrochemical reduction of zirconia under high current density conditions. Poor sinterability and cracking under direct current is apparent and potential mechanisms discussed therein.

Original languageEnglish (US)
Pages (from-to)22-26
Number of pages5
JournalScripta Materialia
Volume190
DOIs
StatePublished - Jan 1 2021

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

Keywords

  • 8YSZ
  • Energy dispersive diffraction
  • Flash sintering
  • Metastable phase
  • ZrO

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