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Ion‐Exchange Method for Fabricating High‐Silica Glasses
Author(s) -
SIMMONS CATHERINE J.
Publication year - 1981
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.1151-2916.1981.tb10268.x
Subject(s) - dopant , ion exchange , porous glass , ion , sintering , leaching (pedology) , inorganic chemistry , solubility , materials science , silicon , porosity , metal , phase (matter) , aqueous solution , silica glass , chemistry , doping , chemical engineering , composite material , metallurgy , organic chemistry , environmental science , optoelectronics , soil science , engineering , soil water
Porous glasses produced by phase separation and leaching are used as substrates for the exchange of metal cations from a basic solution for the protons of silicon‐bonded hydroxyl ions on the pore surfaces and on residual silica gel present in the pores. This method yields extremely homogeneous, fully dense high‐silica glasses with low to moderate concentrations of metal dopants after sintering to collapse the pores. The quantity and rate of ion exchange are studied as a function of time, solution pH, and solution ion concentration for various dopant salts. In addition, a double ion‐exchange method is described whereby, during the second exchange, ions which have a relatively low solubility in basic solutions can be exchanged from a neutral or acidic solution onto the glass surface.