Study On Preparation And Properties Of The ZAS System Transparent Glass-Ceramics

The dissertation presented that a study on preparation and properties of the ZAS system transparent glass-ceramics. ZAS system transparent glass-ceramics doped with rare-earth ion Nd3+ were synthesized by the melting method and annealing technique, TiO₂ and CaF₂ is nucleator.The crystallization heat-treated schedules were determined by DTA results. According to XRD curve, with the crystallization heat-treatment temperature increamed, the main phase changed. The lattice parameter of main crystal phase was calculated by XRD results. It was similar to the lattice parameter of the standard sample. The mean gain size was calculated by XRD results, and it was about ca.11nm. The optical transmittances of the glass and glass-ceramics were measured by UV-Vis-NIR spectrophotometer. With the increase of crystallization heat-treated temperature, the optical transmittances decreamed, even lost transparency. The surface of glass-ceramics were observed by SEM. The grain size was estimated by SEM, and it was similar to the grain size of calculated by XRD results. The fluorescence spectra of the glass and glass-ceramics were measured. The fluorescent characteristics of Nd³⁺ ion were stronger in the glass-ceramic than in the glass matrix. The fluorescent characteristics of Nd³⁺ ion were the strongest in the glass-ceramic containging F-.