Add time:07/18/2019         Source:sciencedirect.com

High-purity Yttrium oxide (cas 1314-36-9) (Y2O3) powder is successfully prepared by microwave-assisted calcination of yttrium oxalate. The decomposition process of yttrium oxalate was analyzed by TG-DSC indicate formation of Y2O3 undergoes three stages. The X-ray diffraction (XRD) analysis indicates that there is no peak of yttrium oxalate hydrate (Y2(C2O4)3‧10H2O) after microwave-assisted calcination at 600 °C for 2 h, with the formation of cubic crystalline Y2O3 structure. Fourier transformed infrared spectroscopy (FT-IR) analysis show similar results with emergence of Y2O3 after calcination at 600 °C for 2 h. The precursor had a median particle size diameter 30.719 μm, while that of all the calcined powders at different temperatures significantly decreased to about 4 μm. Scanning electron microscopy (SEM) observations demonstrate the morphologies of the precursor and product, and the calcined Y2O3 preserved the amorphous character of the precursor, with rod-like shape. All the TG-DSC, XRD, FT-IR and SEM were utilized to understand the molecular changes in the process of microwave-assisted calcination of Y2(C2O4)3 to Y2O3.

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