Synthesis of MgO-Y₂O₃ composite nanopowder with a high specific surface area by the Pechini method

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• 作者：S. Ghorbani ; R. Shoja Razavi ; ^{shoja_r@yahoo.com" class="auth_mail" title="E-mail the corresponding author} ; M.R. Loghman-Estarki ; ^{loghman57@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; A. Alhaji
• 关键词：Y2O3&ndash ; MgO nanopowders ; Pechini method ; Powder synthesis ; Specific surface area
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：345-354
• 全文大小：2678 K

文摘

Yttria-50 vol% magnesia composite nanopowders with a high specific surface area were synthesized by the Pechini sol–gel method. The influences of the mole ratio of citric acid (CA) to transition metals (TM) and the calcination temperature on the properties of the MgO-Y₂O₃ composite nanopowder were investigated. As-synthesized samples were characterized by X-ray diffraction (XRD), field-emission scanning electron microscope (FESEM), transmission electron microscope (TEM), thermal gravimetric-differential thermal analysis (TG/DTA) and Fourier transform infrared (FTIR) analysis. The optimized sample synthesized with CA to TM molar ratio of 10:1, had the average grain size of 10–15 nm with 85.14 m²/g specific surface area. Decreasing the calcination temperature from 800 to 600 °C, increased the specific surface area from 85.14 m²/g to 134.92 m²/g. The FESEM results showed that MgO and Y₂O₃ phases had a uniform distribution phase in MgO-Y₂O₃ composite.