High-entropy, phase-constrained, lanthanide sesquioxide

Kuo Pin Tseng, Qun Yang, Scott J. McCormack, Waltraud M. Kriven

Research output: Contribution to journalArticlepeer-review

Abstract

Oxides can experience structural transformations resulting from variations in cation oxidation states or coordination geometry upon thermal treatment. Whether such structural distortions can affect the stability of high-entropy oxides has not been studied. In this research, a new, high-entropy, lanthanide sesquioxide, Gd0.4Tb0.4Dy0.4Ho0.4Er0.4O3 solid solution having a single phase, cubic-bixbyite structure was synthesized, with no phase transformation from room temperature to 1650°C. The phase stability was examined via both in situ and ex situ, high-temperature, synchrotron, X-ray powder diffraction. This high-entropy oxide could inhibit the phase transformations occurring in constituent monocation sesquioxides, Tb2O3 and Gd2O3, via random arrangement of multications.

Original languageEnglish (US)
Pages (from-to)569-576
Number of pages8
JournalJournal of the American Ceramic Society
Volume103
Issue number1
DOIs
StatePublished - Jan 1 2020

Keywords

  • high-entropy oxides
  • phase transformations
  • rare-earth oxides
  • synchrotron X-ray methods

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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