珪酸塩ガラスにおけるナトリウム・イオンの移動におよぼす2価金属イオンの影響

概要

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Self-diffusion of sodium ions in the system of Na2O-RO-SiO2 glasses containing oxides of divalent ion (RO) such as MgO, CaO, SrO, BaO, ZnO, CdO, PbO were measured in the temperature range 200°-450°C by means of a radio-isotope tracer technique employing 22Na. The electrical conductivity of the glasses has also been measured.Self-diffusion coefficients of sodium ions and electrical conductivity of the glasses decreased smoothly as the effective radius of the substituted divalent cationn increased. This indicates that the braking effects of divalent cations on the migration of sodium ion are largely determined by the polarising powers, i.e., field strengths, of the divalent cations.So-called correlation factor (f) was calculated by the corrected Nernst-Einstein equation, yielding factors about 0.2-0.3 for each glass. The resultant factor indicates that transport mechanism of sodium ions in the glasses is either of a vacancy type or of an indirect interstitial type and is essentially the same to the binary Na2O-SiO2 glasses, and that also is not influenced by the kind of the divalent cation.
社団法人日本セラミックス協会の論文
1968-11-01