The effect of TiO2 and ZrO2 addition on the crystallization of Ce3+ doped yttrium aluminum garnet from glasses in the system Y2O3/Al2O3/SiO2/AlF3

Transparent Nano Crystalline Glass‐Ceramics by Interface Controlled Crystallization

“…For this purpose, up to now, appropriate phosphors embedded in polymers, such as polysiloxanes are state of the art. For higher energy densities, however, the much higher thermal conductivity of a glass‐ceramic material in which the phosphor is directly crystallized from glass is highly advantageous . Another important field is the preparation of ferrites or semiconducting nano‐sized powders from borate glasses.…”

“…For higher energy densities, however, the much higher thermal conductivity of a glass-ceramic material in which the phosphor is directly crystallized from glass is highly advantageous. 3,4 Another important field is the preparation of ferrites 12,13 or semiconducting nano-sized powders [14][15][16] from borate glasses. Here, in a first step, the aimed phase is crystallized from a glass of tailored composition and in a second step, the glass is dissolved in water or acid and finally, a nanocrystalline powder is obtained, which usually exhibits a narrower particle size distribution than powders produced by other methods.…”

“…Glass‐ceramics are expected to play a major role among the nanomaterials, especially with respect to applications in optics and photonics . New properties, which can scarcely be achieved in glassy as well as in polycrystalline materials, should enable the production of challenging materials, such as up‐conversion materials which enable the transformation of near infrared laser radiation to visible light, that is, of light with large wavelength to light with smaller wavelength . For many photonic applications, transparency is essential and light scattering should not occur in a notable extend.…”

“…Besides up‐conversion materials, also materials which show distinct fluorescence properties offer challenging applications . Among the latter, especially materials for white‐blue light‐emitting diodes (LEDs), that is, for the conversion of the light emitted by LEDs to white light are to be mentioned . For higher light density, the heat removal of composites consisting of inorganic phosphors embedded in organic polymers is scarcely possible.…”

Partitioning of rare earths in multiphase nuclear waste glass‐ceramics

“…When Zr does crystallize out, zircon (ZrSiO 4 ) as well as baddeleyite or zirconia (ZrO 2 ) are the primary crystal phases 15 . ZrO 2 is also a useful nucleating agent in various silicate glasses, which can induce the crystallization of Zr‐free phases, such as those containing RE elements 19 …”