Evolution of Crystalline Phase and Morphology of the Products Formed during the Hydrothermal Synthesis of Y2O3 Powders

Ying Wang; Gao Yang Zhao; Li Yuan

doi:10.4028/www.scientific.net/AMR.189-193.1275

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 189-193Evolution of Crystalline Phase and Morphology of...

Evolution of Crystalline Phase and Morphology of the Products Formed during the Hydrothermal Synthesis of Y₂O₃ Powders

Abstract:

The crystalline phase and morphology of the products formed during the synthesis of yttrium oxide via the hydrothermal treatment yttrium nitrate were characterized by X-ray diffraction, transmission electron microscopy and scanning electron microscopy. Products with high OH/NO₃ ratios are formed with the increasing of hydrothermal treatment. The crystalline phases are evolved from Y₂(OH)_5.14(NO₃)_0.86•H₂O toY₄O(OH)₉(NO₃) and finally Y(OH)₃. The hydrothermal reaction conditions play an important role in the synthesis of the microstructures. Results show the particle size and ﬁnal morphology of samples could be controlled by reaction temperature, reaction time, and OH^- concentration. Sheets, hexagonal and needle-like Y₂O₃ powders are obtained with the hydrothermal treatment of yittrium nitrate at 180 oC to 200oC for 2-8 hours at pH 9-13.