Title of article :
Crystallization and structural evolution of YF3-SiO2 xerogel
Cheng، Kuang-Yao نويسنده , , Luo، Wenqin نويسنده , , Wang، Yuansheng نويسنده , , Bao، Feng نويسنده , , Zhou، Lihua نويسنده ,
YF3-SiO2 glass-ceramic was prepared by sol-gel method for the first time. When the xerogel was heat-treated to 400 °C, YF3 crystallites sized around 5 nm were precipitated from the silica matrix and aggregated together to form 50-100 nm congeries particles. With further increasing of the temperature, YF3 crystallites tended to separate from the congeries with their sizes unchanged, resulting finally in a homogeneous distribution among the glassy matrix. The crystallization activation energy of YF3 was evaluated to be 129 and 139 kJ/mol by Kissingerʹs method and Chenʹs method through non-isothermal experiments, respectively, implying that the crystallization is controlled by long-range atomic diffusion. The evolution of textural properties of YF3-SiO2 glass ceramics with temperature was also investigated mainly through N2 adsorption experiments.
Glass ceramics , Sol-gel , YF3 crystallites , Textural property , Microstructure
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