Abstract
The internal friction and the Young's moduli of pure SiO 2, SiO 2 –4 mol% F and –8 mol% F glasses were measured in the temperature range of 1.6–250 K. The temperature dependencies of the internal friction were not different except for their peak values, which showed differences of a few percent at 35 K. In contrast, the Young's moduli of F-doped SiO 2 glasses were 7.5% (–4 mol% F) and 15% (–8 mol% F) less than that of pure SiO 2 glass, respectively. Both temperature dependencies were analyzed on the basis of Debye relaxation by the distributed double-well potential model.
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