Na self-diffusion has been studied below T-g in a series of ZrF4-BaF2-LaF3-NaF glasses with NaF contents of 10, 20, and 30 mol%, respectively. The D-Na(+) values range between about 10(-12) and 10(-14) cm(2)/s and drop exponentially with increasing NaF content. For the precision of the diffusion data an anhydrous deposition of the radioactive tracer Na-22 on the highly reactive glass surfaces was essential. (C) 2003 Elsevier B.V. All rights reserved. [References: 8]
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