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Leaching of Lead and Connectivity of Plumbate Networks in Lead Silicate Glasses
Author(s) -
Mizuno Megumi,
Takahashi Masahide,
Takaishi Taigo,
Yoko Toshinobu
Publication year - 2005
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.1551-2916.2005.00508.x
Subject(s) - silicate , leaching (pedology) , silicate glass , mineralogy , materials science , lead (geology) , ion , diffusion , lead oxide , network structure , chemical composition , analytical chemistry (journal) , chemistry , geology , environmental chemistry , thermodynamics , metallurgy , soil science , soil water , physics , organic chemistry , geomorphology , machine learning , computer science
The formation of a plumbate network in binary lead silicate glasses was examined based on the leaching behavior of Pb 2+ in lead silicate glasses over a wide composition region. The effective diffusion coefficient of Pb 2+ at 40°C was on the order of 10 −17 m 2 /s for PbO<35 mol% glasses, and increased three orders of magnitude for 35–50 mol% PbO contents. Such a steep composition dependence is considered to be because of changes in the medium or longer range structure. That is, it is proposed that the plumbate network forms a percolative 3D network in the composition region to form diffusion paths for the lead ions. In addition, the present results indicate that the lead ion exists as a network former over the entire glass forming composition range of the binary silicate glasses.