Author/Authors :
Duan، نويسنده , , X.L. and Yuan، نويسنده , , D.R and Xu، نويسنده , , D. and Lu، نويسنده , , M.K. and Wang، نويسنده , , X.Q. and Sun، نويسنده , , Z.H. and Wang، نويسنده , , Z.M. and Sun، نويسنده , , H.Q. and Lu، نويسنده , , Y.Q.، نويسنده ,
Abstract :
Transparent glass-ceramics containing Co2+:ZnAl2O4 nanocrystals were obtained by the sol–gel process for the first time. The gels of composition 89SiO2–5.9Al2O3–4.9ZnO–0.2CoO (ZAS) were prepared at room temperature, and heat-treated at different temperatures. The microstructure and optical properties of the heated samples were studied by using X-ray diffraction (XRD), transmission electron microscopy (TEM), infrared spectroscopy, and optical absorption spectra. Co2+:ZnAl2O4 nanocrystals were precipitated from ZAS system and dispersed in the SiO2-based glass during heat-treatment in the temperature range 900–1100 °C. Co2+ ions were located in tetrahedral sites in ZnAl2O4 nanocrystals. The Co2+:ZnAl2O4 crystallite size was in the range of 4–15 nm.
Keywords :
ceramics , Sol–gel chemistry , X-ray diffraction , Nanostructure , Electron microscopy
