In Situ Diffraction from Levitated Solids Under Extreme Conditions—Structure and Thermal Expansion in the Eu 2 O 3 –ZrO 2 System

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

doi:10.1111/jace.13422

Title: In Situ Diffraction from Levitated Solids Under Extreme Conditions—Structure and Thermal Expansion in the Eu ₂ O ₃ –ZrO ₂ System

Journal Article · Wed Dec 31 00:00:00 EST 2014 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/jace.13422· OSTI ID:1400680

Maram, Pardha S. ^[1]; Ushakov, Sergey V. ^[1]; Weber, Richard J. K. ^[2]; Benmore, Chris J. ^[3]; Navrotsky, Alexandra ^[1]; Raveau, ed., B.

Peter A. Rock Thermochemistry Laboratory and Neat ORU University of California, Davis One Shields Avenue 4415 Chemistry Annex Davis California 95616
Materials Development, Inc. 3090 Daniels Court Arlington Heights Illinois 60004, X‐ray Science Division Advanced Photon Source Argonne National Laboratory 9700 S. Cass Avenue Lemont Illinois 60439
X‐ray Science Division Advanced Photon Source Argonne National Laboratory 9700 S. Cass Avenue Lemont Illinois 60439

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 Eu ₂ O ₃ –ZrO ₂ binary system were investigated, including the high‐temperature order–disorder transformation in Eu ₂ Zr ₂ O ₇ . 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 Eu ₂ Zr ₂ O ₇ 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 ⁻⁶ C ⁻¹ . These studies open new vistas for in situ exploration of complex structural changes in high‐temperature materials.

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Sponsoring Organization:: USDOE

OSTI ID:: 1400680

Journal Information:: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Vol. 98 Journal Issue: 4; ISSN 0002-7820

Publisher:: Wiley-BlackwellCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 25 works

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