In situ diffraction from levitated solids under extreme conditions-structure and thermal expansion in the Eu2O3-ZrO2 system

Pardha S. Maram, Sergey V. Ushakov, Richard J.K. Weber, Chris J. Benmore, Alexandra Navrotsky

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

The accurate determination of structure and thermal expansion of refractory materials at temperatures above 1500°C is challenging. Here, for the first time, we demonstrate the ability to reliably refine the structure and thermal expansion coefficient of oxides at temperatures to 2200°C using in situ synchrotron diffraction coupled with aerodynamic levitation. Solid solutions in the Eu2O3-ZrO2 binary system were investigated, including the high-temperature order-disorder transformation in Eu2Zr2O7. The disordered fluorite phase is found to be stable above 1900°C, and a reversible phase transition to the pyrochlore phase is noticed during cooling. Site occupancies in Eu2Zr2O7 show a gradual increase in disorder on both cation and anion sublattices with increasing temperature. The thermal expansion coefficients of all cubic solid solutions are relatively similar, falling in the range 8.6-12.0 × 10-6C-1. These studies open new vistas for in situ exploration of complex structural changes in high-temperature materials.

Original languageEnglish (US)
Pages (from-to)1292-1299
Number of pages8
JournalJournal of the American Ceramic Society
Volume98
Issue number4
DOIs
StatePublished - Apr 2015
Externally publishedYes

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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