Citation: ZHANG Jun-Jun, ZHONG Ya, SHEN Xiao-Dong, CUI Sheng, KONG Yong, JI Li-Li, LI Bo-Ya. Properties and Characterization of SiO2 Monolithic Aerogels Doped with Yttrium[J]. Chinese Journal of Inorganic Chemistry, ;2014, 30(4): 793-799. doi: 10.11862/CJIC.2014.136
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Yttrium doped SiO2 monolithic aerogels were prepared with YCl3·6H2O, TEOS as raw material by sol-gel method and CO2 supercritical drying technique, and the doping concentrations are in the range of 5wt%~30wt% Y2O3. The structures and properties of samples were analyzed by means of SEM (Scanning electron microscope), TEM (Transmission electron microscope), XRD (X-ray diffraction), BET (Brunauer-Emmett-Teller) and XRF (X-ray fluorescence). The results showed that Y2O3-SiO2 aerogels maintained the original space network structures of SiO2 aerogels. Improvements in thermal stability were obtained by incorporation of yttrium species during the aerogels preparation. When treated by the thermal treatment with 900 ℃ for 2 h, the 10wt% (0.447 g of YCl3·6H2O)Y2O3-SiO2 aerogels still showed an amorphous state and gave a larger surface area of 643.79 m2·g-1,and the average pore diameter was about 21.3 nm.
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