关键词: 玻璃形成, 稀土, 掺杂, 析晶, 热稳定性

Abstract: The glass-forming range of rare earth oxide and BaO co-doped Al2O3-B2O3-SiO2 system was explored, and the effect of the rare earth oxide content on glass-forming region was examined firstly. Then the effect of the rare earth oxides content on the glass thermo-stability was analyzed through differential thermal analysis technique. Finally, the glass after heat-treatment near Tx (the temperature at the beginning of exothermic peak formation) formation temperature was analyzed using XRD and TEM/EDS analyses. The results showed that the region of glass-forming range expanded firstly, and then shrank when the rare earth content increased gradually. The glass lacking of transparence after heat treatment near Tx was due to the phase separation, and the rare earth ions mainly distributed in the boron-aluminum rich phase, the higher the glass heat-treatment temperature, the more seriously the glass phase separation occurred. When the glass was heat-treated at a high temperature of 900℃, the diffraction peaks of crystal were very obvious in the XRD spectrum. Through comparing and analyzing, the main crystalline phase might be determined as SmAl2.07(B4O10)O0.6 with the same structure as NdAl2.07(B4O10)O0.6.

Key words: glass forming, rare earth, doping, crystallization, thermal stability