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Effect of Water Content on the Electrical Conductivity of Sodium Trisilicate Glasses
Author(s) -
Jewell John M.,
Shelby James E.
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.tb05224.x
Subject(s) - electrical resistivity and conductivity , water content , molar volume , annealing (glass) , activation energy , mineralogy , conductivity , sodium , volume (thermodynamics) , chemistry , materials science , analytical chemistry (journal) , composite material , thermodynamics , metallurgy , environmental chemistry , geology , electrical engineering , physics , geotechnical engineering , engineering , organic chemistry
The effect of variations in water content on the direct‐current electrical conductivity of Na 2 O · 3SiO 2 glass was measured. Increasing the water content of this glass from 10 to 500 wt ppm of H 2 O results in an increase in the resistivity of a factor of 2 to 3. The increase in resistivity is accompanied by an increase in the activation energy for conduction. Increasing resistivity with increasing water content is attributed to decreasing molar volume. Under identical annealing conditions, “wetter” glasses relax to a smaller molar volume (greater density) because of the presence of a larger number of “terminal” hydroxyl species that allow structural relaxation to continue to lower temperatures.