Study Of The Rare Earth Doped Phosphate Glass Ceramics

The transparent phosphate system glass-ceramics was synthesized by the melting method and annealing technique. The crystallization heat-treated schedules were based on DTA results. The compositions and structure of crystal phases were determined on the base of XRD results. The main crystal phase is Al₂SiO₅ that belongs to the transparent phosphate system glass-ceramics which contains SiO₂. The main crystal phase are AlPO4 and Al2P6O18 that belong to the transparent phosphate system glass-ceramics which is without SiO₂. The P2O5 system glasses with good crystallization ability were nucleated at 400℃⁶70℃and crystallized at 530℃⁷40℃. The microstructure of the transparent phosphate system glass-ceramics was characterized by SEM. The grain size range is 1.66⁴36.05nm. The grain size range of P5 is 70.34¹49.05nm. The fluorescence spectra of the base and glass-ceramic heat-treated at different schedules were measured. The influences of crystal phase compositions and microstructure were determined. Phase compositions and grain size of glass-ceramics were found to affect their fluorescent characteristics considerably. Three main fluorescence bands centering at about 878nm,1054nm and 1330nm were observed, which were correspondent to the transitions of ⁴F_3/2→⁴I_9/2,⁴F_3/2→⁴I_11/2 and ⁴F_3/2→⁴I_13/2,respectively. The fluorescent intensity of glass-ceramics is stronger than the fluorescent intensity of base glass. The transmittance in the infrared region is obtained and compared. The transmittance of P5 is at 69⁷5%, it is higher than others. P5 is the best system to study.