16.3Na_2O・33.7MgO・50.0SiO_2ガラスの内部摩擦

概要

論文の詳細を見る
The internal friction of 16.3Na_2O ・ 33.7MgO ・ 50.0SiO_2 glass was measured with an inverted torsion pendulum in the frequency range 0.35 0.95 Hz, and the tracer diffusion coefficients of oxygen and magnesium were Measured at temperatures below the glass transition point by use of stable isotopes ^<18>O and ^<26>Mg, respectively. The temperature dependence of the relaxation time of a high temperature peak was represented by ^<τ>H.P. (s) = (2.04±0.05)×10^<-15>×exp[{183.8±5.7 (kJ/mol )} /RT) The temperature dependence of the tracer diffusion coefficients for oxygen and magnesium was represented by the following equations: D_<Oxy>(m^2・s^<-1>) = (1.22±0.06)×10^<-10>×exp [{-150.2±5.1 (kJ/mol) /RT) D_<Mg>(m^2・s^<-1>) = (4.29^<+1.57>_<-1.15>) ×10^<-6>×exp [{-195.3±19.9 (kJ/mol) } /RT] The activation energy for the high temperature peak (183.8 kJ/mol) was smaller than that for magnesium diffusion (195.3 kJ/mol) by about 7% but greater than that for oxygen diffusion (150.2 kJ/mol). Comparison of the results of the present study with those obtained by Hino et al.^<1)> Ied to the conclusion that the high temperature peak was caused by the movement of magnesium ion under stress.
1994-01-01