Sabioni, Antônio Claret SoaresZanotto, Edgar DutraMillot, F.Tuller, H. L.2012-07-162012-07-161998SABIONI, A. C. S. et al. Oxygen self-diffusion in a cordierite glass. Journal of Non-Crystalline Solids, v. 242, n. 2-3, p. 177-182, dez. 1998. Disponível em: <https://www.sciencedirect.com/science/article/pii/S0022309398008060>. Acesso em: 16 jul. 2012.00223093http://www.repositorio.ufop.br/handle/123456789/1130Oxygen self-di€usion measurements determined below and above the glass transition temperature in a cordierite glass are reported. The di€usion experiments were performed by the solid±gas isotope exchange method using 18O as a tracer in H2±H2 18O and Ar/18O2 atmospheres. The 18O di€usion pro®les were established by secondary ion mass spectrometry (SIMS) after appropriate di€usion annealing. The oxygen di€usion coe cients changed at the glass transition temperature as expected. The atmosphere a€ected the oxygen di€usivity in agreement with other studies. The di€usion data were useful for comparisons with di€usion controlled process in the same glass. There is a di€erence between the activation enthalpies for crystal growth, viscous ¯ow, and oxygen self-di€usion. Hence, bond-breaking and molecular reorientation required for crystallization and the atomic transport mechanism involved in viscous ¯ow are not correlated in any obvious way to oxygen di€usion in cordierite glass. Ó 1998 Elsevier Science B.V. All rights reserved.en-USArtigo publicado em periodicoO periódico Journal of Non-Crystalline Solids concede permissão para depósito do artigo no Repositório Institucional da UFOP. Número da licença: 3345930562134.