Longitudinal and transverse wave velocities, moduli (Young's, shear, bulk) other parameters (Lamé, Poisson, Debye temperature) and internal friction (dilatational, shear) of fused quartz were measured simultaneously at temperatures ranging from 73 to 400K (using ultrasonic pulse waves with a frequency of 7.7MHz). A large increase in the Young's and bulk moduli, and a small increase in the shear modulus and Lamé parameter, indicated an increase in rigidity during heating. This was attributed to a quasi-crystallization which was associated with the lateral motion of O atoms and the relief of macroscopic strain. Peaks at 99 and 137K in the shear friction were suggested to be related to dielectric loss peaks that arose from Al3+-Na+ and Al3+-K+ substitutional-interstitial paired defects.

M.Fukuhara, A.Sanpei, K.Shibuki: Journal of Materials Science, 1997, 32[6], 1207-11