ソーダ・アルミノ珪酸塩ガラスの電気伝導度とナトリウムイオンの自己拡散係数

概要

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Self-diffusion of sodium ions in the system of Na2O-2SiO2-xAl2O3 glasses has been measured for x values from 0.1 to 1.2 in the temperature range from 200°C to 650°C by means of a radio-isotope tracer technique employing 22Na. The electrical conductivity of the glasses has also been measured.The discontinuous changes of diffusion coefficients, electrical conductivities and their activation energies at Al/Na=1 have been discussed with respect to the change of glass structure in terms of the oxygen-coordination numbers of aluminium ions. Calculation of correlation factor (f) has been carried out for the modified Nernst-Einstein equation, D/σ=(kT/Ne2)⋅f. The resultant correlation factors of about 0.2-0.3 have been interpreted to be due to diffusion of sodium ions by a vacancy or indirect interstitial mechanism. The absence of abrupt change of the correlation factor with variation of the Al/Na ratio has been discussed for possibility of a single predominant diffusion mechanism.
社団法人日本セラミックス協会の論文
1968-06-01