Abstract
The total structure factors, S(Q), of vitreous silica by high-energy X-ray diffraction technique around the glass transition temperature, Tg(=1180°C), to investigate the difference of intermediate-range order. The intensity of the First Sharp Diffarcion Peak (FSDP) at 1060°C is almost same as that at room temperature, though the peak position shifts slightly to lower Q, due to small thermal expansion. On the other hand, the intensity of the FSDP at 1345°C is smaller than that at 1060°C. It indicates that the small modification of the intermediate-range order is observed around the glass transition temperature.
