Abstract
Fabrication and crystallization behavior of glasses in the system ZnO.B2O3.SiO2.Al2O3 were studied via melt–quenching method; ZnO/SiO2 ratio was changed from 5.4 to 1.4. Heat treatments, according to Differential Scanning Calorimetric (DSC) beside 1050 °C/2 h were done to study the effect of temperature on the development and stability of the crystallized phases and microstructure. Nano crystallite α-Willemite was detected by X-ray diffraction analysis (XRD). The decrease in the crystallite size was enhanced with decrease ZnO/SiO2 ratio under fixed heat treatment temperature; while increase in crystallite size in the same composition with increasing heat treatment temperature was observed. The sequence of crystallization started with Zn3(BO3)2, then β-willemite (Zn2SiO4) which converted to α-willemite with increasing temperature; traces of gahnite (ZnAl2O4) was appeared at 1050 °C/2 h. Photoluminescence revealed bluish white emission with different intensity after exposing to λex = 254 nm; so the prepared material can nominate to optical applications such as light emitting and laser diodes.
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