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Interfacial Characterization of Silicon Nitride Powders
Author(s) -
Bergström Lennart,
Pugh Robert J.
Publication year - 1989
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.1151-2916.1989.tb05961.x
Subject(s) - potentiometric titration , silicon nitride , silicon , aqueous solution , nitride , titration , materials science , chemical engineering , silicon oxynitride , inorganic chemistry , chemical state , leaching (pedology) , chemical composition , layer (electronics) , chemistry , x ray photoelectron spectroscopy , metallurgy , nanotechnology , ion , organic chemistry , soil science , engineering , soil water , environmental science
The composition of the surface and the behavior in aqueous suspensions of three silicon nitride powders were investigated using electron spectroscopy for chemical analysis (ESCA), potentiometric titrations, leaching experiments, and electrophoretic mobility. ESCA shows that the as‐received powders have a surface‐layer composition similar to that identified as an intermediate state between silica and silicon oxynitride. The original differences in pH iep between the three powders disappears by aging the powders. The common pH iep of 6.8 ± 0.3 for the three powders is interpreted as the equilibrium pH iep for silicon nitride in aqueous suspensions.