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Self-diffusion coefficients of Nay ion in NaPO3-Al(PO3)3 glasses at temperatures about transition points were measured by means of tracer technique using radio-isotope 22Na. 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 20 kcal/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 diffusion coefficient, Di, and the electrical conductivity, ƒÐ, of solid is given by

yōgyō kyōkaishi/yougyou kyoukaishi

Self-diffusion Coefficients of Na&lt;sup&gt;+&lt;/sup&gt; Ion in NaPO&lt;sub&gt;3&lt;/sub&gt;-Al(PO&lt;sub&gt;3&lt;/sub&gt;)&lt;sub&gt;3&lt;/sub&gt; Glasses about Transition Temperatures