High-pressure, high-temperature synthesis and properties of the monoclinic phase of Y₂O₃

Abstract

The monoclinic phase of Y₂O₃(B-RES) has been synthesized using a Kawai-type multi-anvil apparatus at 20 GPa and 1800 °C. Samples of the cubic Y₂O₃(C-RES) and monoclinic Y₂O₃ phases were characterized by synchrotron radiation X-ray diffraction, X-ray absorption near edge structure and Raman spectroscopy. Crystal structures of the cubic and monoclinic phases have been examined using Rietveld refinement of the X-ray diffraction data. The cubic-to-monoclinic transition of Y₂O₃ was reconstructive and irreversible. The X-ray diffraction results were further confirmed by simulation of the X-ray absorption spectra.

Keywords

Y₂O₃ / High pressure / Multi-anvil synthesis

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