XNa_2O・(1-X)B_2O_3・2SiO_2ガラスの内部摩擦と酸素の拡散(第1報) : 内部摩擦

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Internal friction peaks in XNa_2O・(1-X)B_2O_3・2SiO_2 glasses (X=0.3, 0.45, 0.6, 0.7, 0.75, 0.8, 0.9, 1.0) were studied in torsional vibration in the frequency range 0.35-0.8 Hz. The influence of Na_2O content on the height of low-temperature peaks and the origin of high-temperature peaks were discussed on the bases of Dell's model on the structure of alkali borosilicate glass, and a method for the determination of the activation energy within a reasonable accuracy was developed. It is concluded that, on the glasses with X≦0.8, sodium ions bounded to BO_4 tetrahedron, BO_3 triangle and SiO_4 tetrahedron make different extent of contributions to the height of the low-temperature peak and that the movement of non-bridging oxygen in BO_3 triangle under stress is responsible for the high-temperature peak. The activation energy for the high-temperature peak was determined within a probable error of 6% by the approximation of the high-temperature peak and frequency curve with an equation including terms up to fourth order, and the background of the peak with all equation including terms up to third order.
1992-03-01