NaPO_3-Al(PO_3)_3系ガラスの転移点附近におけるNa^+イオンの自己拡散係数

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Self-diffusion coefficients of Na^+ ion in NaPO_3-Al(PO_3)_3 glasses at temperatures about transition points were measured by means of tracer technique using radio-isotope ^<22>Na. The counting of radio-activity at successively ground surfaces gave better results than that of powders removed by grinding because of less experimental errors. The activation energies for the diffusion of Na^+ ion above and below transition points were 30 kcal/mole and 20kcal/mole respectively, which were in accord with the values in silicate glasses and were also agreed with the activation energies for the electrical conductivity of these glasses. According to a corrected Nernst-Einstein equation, the relation between the diffusion coefficient, D_i, and the electrical conductivity, σ, of solid is given by Di=(σt_ikT)/(N_iZ_i^2e^2)・f where t_i is the transfer number, k is Boltzmann constant, T is the absolute temperature, n_i is the number of ions per cubic centimeter, Z_i is the valence, e is the electronic charge, f is the correlation factor named by Bardeen and Herring. The f-value obtained from the author's experiment was about 0.15〜0.25, and this value was maintained at temperatures above and below the transition point. It was interpreted, therefore, that the transport mechanism of Na^+ ion in these glasses about transition temperatures is one of the indirect interstitial (interstitialcy) transport rather than the simple vacancy transport.
社団法人日本セラミックス協会の論文
1964-01-01

NaPO_3-Al(PO_3)_3系ガラスの転移点附近におけるNa^+イオンの自己拡散係数

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