The Dissoliving Phnomenon of SiO_2-La_2O_3 (CeO_2)-Na_2O System Glasses

The dissolving phnomenon of SiO_2-La_2O_3 (CeO_2)-Na_2O system glasses were studied in this paper. The fused glasses were powdered into paticles of 35-60 meshes and lg of them were immered in 50cc water of 30,50 and 70℃ and agtated for 10,20,40 and 80min. Then the amount of Na ion dissolved in water was measured by 0.01N HCl. The results were as follows. (1) Log of amount of Na ion dissolved in water was linear function of log dissolving time and the reciprocal of dissolving temperature. (2) The amount of Na ion dissolved in water did not depend on La_2O_3 (CeO_2) mole in glasses. (3) The amount of Li ion dissolved in water was little and the amount of Na ion was much.