The relationship between structure and transparency in glass-ceramic materials

Glass structure and ion dynamics of lead–cadmium fluorgermanate glasses

“…The socalled ultratransparent glass ceramics, where metal fluorides nanocrystals are identified in the oxide glass host, can be obtained by controlled crystallization treatment. [7][8][9][10][11][12][13][14][15] These oxifluoride materials have been studied by different experimental techniques such as optical spectroscopy, transmission electron microscopy, thermal analysis, conductivity measurements, and F(1s) x-ray photoelectron spectra. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] Nuclear magnetic resonance ͑NMR͒ is a wellknown experimental technique to study glass structure and ion dynamics.…”

Optical intensities of Pr3+ ions in transparent oxyfluoride glass and glass–ceramic. Applications of the standard and modified Judd–Ofelt theories

“…These matrices can be easily melted and handled in air-atmosphere, after a thermal treatment of the precursor glass the subsequently obtained glass-ceramic still shows a large transparency and the lanthanide ions are mainly incorporated in fluoride nanocrystals (low-energy phonon environments) embedded in the oxide glassy bulk [1][2][3][4][5]. Moreover, they have superior macroscopic (optical, mechanical, chemical, .…”

Highly Transparent BaAl4O7 Polycrystalline Ceramic Obtained by Full Crystallization from Glass

“…As described by the Rayleigh-Ganz [ 12 ] particle scattering theory, transparency is possible only if domain sizes are much smaller than the targeted wavelength and if the differences in the refractive index between the crystalline precipitates and glass matrix are minimized. [ 13 ] Low crystal birefringence within the crystalline phase is also desirable and is a constraint which favours cubic symmetry systems with isotropic domain scattering. With the sole exception of a nanoscale, crystalline aluminate ceramic derived by highpressure and high-temperature treatment of a glass precursor, [ 14 ] to the best of our knowledge, there are no reports of fully dense polycrystalline optically transparent ceramics attained by a complete, direct bulk glass crystallization synthesis route.…”