The Preparation And Characterization Of Rare Earth Doped Aluminium Silicate System Transparent Glass-Ceramic

This dissertation presented that the origin and development.The compositions, structure and processes of glass-ceramics were discussed. The synthetic methods and applications of glass-ceramics were outlined, and the developing trend of Li2O-B2O3-Al2O3-SiO2 (LBAS) was forecasted.Transparent Li2O-B2O3-Al2O3-SiO2 (LBAS) system glass-ceramics dopped Sm3+were prepared by the melting method and crystal technique. The glass was prepared as 8ZnO-18Al2O3-30SiO2-24B2O3-3ZrO2-3TiO2-12Li2O. The crystallization heat-treated schedules were based on DSC results. The compositions and structure of crystal phases were determined on the base of XRD results. The transparent LBAS glass-ceramics with main crystal phase-Al4BO9 and minor crystal phase-SiO2 solid solutions, ZnAl04 were obtained after LBAS system glasses with good crystallization ability were nucleated at 570℃and crystallized at 700-780℃. It was shown that the little change to the compositions influenced the crystal phases unmarkedly.. The optical transmittances of the LBAS glass-ceramics were measured by spectrophotometer. The influences of crystallization heat-treated schedules to the optical transmittance were discussed.Fluoresce nce spectrometer was used to get the emission and excitation spectra of samples. Four main fluorescence bands centering at about564nm,601nm,648nm and 780nm were observed, The effectively induced Sm3+were increased a lot than without Sm3+dopped LZBS glass ceramics.