Premium
Undulating Structure in Complex Silicate Glasses
Author(s) -
OHLBERG S. M.,
GOLOB HELEN R.
Publication year - 1973
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.1151-2916.1973.tb12500.x
Subject(s) - silicate , mica , silicate glass , mineralogy , chemical composition , materials science , geology , crystallography , chemistry , composite material , organic chemistry
Complex silicate glasses (e.g. commercial plate, sheet, and ophthalmic compositions), mica, and fused SiO 2 were carefully examined in the electron microscope using Pt‐C replicating techniques. The complex glasses show an undulating structure at 300 to 500 Å, whereas the mica and fused SiO 2 do not. The low contrast observed between peak and valley is consistent with a small difference in chemical composition. The observed structure is explained in terms of an extension of the anionic model for molten silicates whereby the peaks and valleys result from clustering of silicate anions accompanied by partial expulsion of cations to the periphery.