Transparent Oxyfluoride Glass-Ceramics Containing CaF₂ Nano-Crystalline Phase

Abstract:

Transparent oxyfluoride tellurite glass with the composition of TeO₂-SiO₂-AlF₃-CaO-KF system were prepared by conventional melting and annealing technique, and the transparent oxyfluoride glass-ceramics containing CaF₂ nano-crystallines were obtained by controlled heat-treatment. The effect of heat-treatment schedules on the crystallization behavior and the microstructure of the glass-ceramics were analyzed by differential scanning caborimetry (DSC) analysis, X-ray diffraction (XRD) analysis, infrared (IR) spectrum and scanning electron microscopy (SEM). The sole CaF₂ crystalline phase was confirmed by XRD, the spherical CaF₂ nano-crystallines at about 20~100nm embed homogeneously among the glassy matrix after crystallization by SEM observation. The size of CaF₂ grains grew with the increase of crystallization temperature and holding time. Te and Si atoms existed in [TeO₃] and [SiO₄] forms. Part of Al atoms existed in the form of [AlO₄] and formed network together with [SiO4] tetrahedron. The other Al atoms acted as modifiers in the form of [AlO₆]. The transmittance of glass-ceramics can reach 85% in visible light and 90% in infrared waveband. The novel transparent oxyfluoride tellurite glass-ceramics are excellent matrix materials in up-conversion luminescence field.

• Periodical: Key Engineering Materials (Volumes 512-515)
• Pages: 1015-1018
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.512-515.1015
• Online since: June 2012
• Authors: Zhao Xia Hou, Zhao Lu Xue, Shao Hong Wang, Xiao Dan Hu, Hao Ran Lu, Chang Lei Niu, Hao Wang, Cai Wang, Yin Zhou
• Keywords: CaF₂ Nano-Crystalline, Microstructure, Oxyfluoride Glass-Ceramics, Tellurite Glass

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