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Internal Friction of Glasses with Low Water Contents
Author(s) -
DAY DELBERT E.
Publication year - 1974
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.1151-2916.1974.tb10803.x
Subject(s) - alkali metal , ion , silicate glass , internal friction , phosphate glass , materials science , mineralogy , silicate , phosphate , analytical chemistry (journal) , proton , chemistry , composite material , physics , chromatography , organic chemistry , quantum mechanics
Internal friction was measured for NaPO 3 glasses containing from 0.0004 to 0.146 wt% H 2 O. In glasses containing ≤ 0.001 wt% H 2 O, the only internal friction peak observed was that resulting from the Na + ions, i.e. the alkali peak; it was ∼ 30% larger than in as‐melted glasses. The second peak normally observed in as‐melted NaPO 3 glass was completely absent when the water content was < 0.001 wt%, consistent with the interpretation that it is caused by a reorientation of proton‐Na + elastic dipoles. The concept that the second peak in as‐melted alkali phosphate and silicate glasses results from nonbridging oxygen ions is not substantiated by these studies of NaPO 3 glasses, which contain a high percentage of these ions but do not exhibit this peak when the proton concentration is sufficiently low.