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A thermal expansion ten times larger than that of silica glass was observed for the pressed compacts of silica glass powder, which was ground with a planetary pot mill. The extent of the thermal expansion increased with increasing the grinding time. Since quartz powder compacts did not undergo much thermal expansion after grinding, such a large thermal expansion behavior of the silica glass powders seemed to be unique for the silica glass. Solid state 29Si NMR and IR spectra showed a reduction in the Si-O-Si bonding angle, which resulted due to a distortion of the silica glass network.

Grinding Effect of Powder on Thermal Expansion of Silica Glass Powder Compacts