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Self Diffusion in Na 2 O‐Rb 2 O‐SiO 2 Glass Melts as Obtained by Microgravity Experiments
Author(s) -
Meier Martin,
Braetsch Volker,
Frischat Günther H.
Publication year - 1990
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1990.tb05283.x
Subject(s) - rubidium , diffusion , self diffusion , thermodynamics , nernst equation , chemistry , analytical chemistry (journal) , sodium , alkali metal , mineralogy , materials science , physics , potassium , chromatography , self service , organic chemistry , electrode , marketing , business
Sodium and rubidium self‐diffusion in several melts of the system (1 − x )Na 2 · x Rb 2 O·3SiO 2 were studied at temperatures greater than 1150°C under microgravity conditions. The diffusion coefficients ( D *) may be considered as intrinsic data. At 1250°C, D * Na in this system is nearly independent of Rb 2 O concentration, whereas D * Rb is more impeded the higher the Na 2 O content. Furthermore, it can be confirmed that the Nernst‐Planck model, which relates selfdiffusion and interdiffusion coefficients, is also reasonably well fulfilled for this high‐temperature melt state.