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

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In Part of the present paper the internal friction of XNa_2O・(1-X)B_2O_3・2SiO_2 glasses was measured and the cause for the high-temperature peak was explained on the basis of the theory on the structure of alkali borosilicate glass proposed by Dell et al. In the present paper diffusion coefficients of oxygen in the glasses of the same composition system described above have been measured at temperatures below the glass transition points, and the mechanism for oxygen diffusion in this temperature region has been discussed by the citation of the data from literature on diffusion in glasses. The activation energies for oxygen diffusion are in good agreement with those for a mechanism for high-temperature peak observed on the internal friction curves. It is concluded that the results described above present the proof that the high-temperature peak is caused by the movement of non-bridging oxygen under stress, and that the diffusion of oxygen below the glass transition point occurs in the presence of lattice defects frozen-in at the glass transition point.
1992-05-01