Transparent Glass Ceramics Based On Zno Crystals

When las or mas glasses nucleated by tio 2 or zro 2 are doped with re ions re 2 ti zr 2 o 7 crystals with the defect fluorite structure precipitate.

Transparent glass ceramics based on zno crystals.

The glass must be melted at temperatures over 1600 c and crystallization occurred at temperatures between 650 and 1100 c. Glass ceramics based on hexagonal zno crystals can be obtained in the sio 2 al 2 o 3 zno k 2 o system. Transparent zincite zno glass ceramics were obtained by secondary heat treatments at 680 860 c. The materials can be.

At 860 c traces of eu oxyapatite appeared in addition to zno nanocrystals. Transparent glass ceramics based on nano sized crystals of re titanates and titanates zirconates. Controlling the crystallization condition can allow the formation of highly transparent zno doped gcs. Pinckney reported the first zno precipitated tgc based on a parent glass of sio 2 al 2 o 3 zno k 2 o.

Nano sized zno crystals could precipitate in quenched glass ahead of heat treatment when x 40 in 44sio 2 11al 2 o 3 x zno 10k 2 o mol i e with a particular precursor composition 41 9sio 2 10 5al 2 o 3 38 1zno 9 5k 2 o mol after normalization. The average crystal size obtained from the x ray diffraction data was found to range between 14 and 35 nm. As the b 2 o 3 is replaced by zno gradually the glass transition temperature changed slightly while the onset crystallization temperature and the crystallization peak temperatures shifted to lower values. Transparent cordierite based glass ceramics with high crystallinity were prepared by the controlled crystallization of parent glass with different zno additions.

38 45 47 at elevated temperatures a disordered and then ordered pyrochlore type structure is. The materials can be highly transparent with zno crystal sizes on the order of 5 20 nm dispersed uniformly throughout an alkali aluminosilicate glass. Transparent glass ceramics gcs based on co2 zno nanocrystals mean diameter 11 nm are synthesized on the basis of cobalt doped glasses of the k2o zno al2o3 sio2 system.