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Phase Separation and Structural Differences between Alkali Silicate Glasses Prepared by the Sol‐Gel and Melt‐Quench Methods
Author(s) -
Roy Biswanath,
Jain Himanshu,
Saha Shyamal K.,
Chakravorty Dipankar
Publication year - 1998
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.1151-2916.1998.tb02632.x
Subject(s) - materials science , silicate glass , phase (matter) , silicate , alkali metal , sintering , x ray photoelectron spectroscopy , glass transition , sol gel , chemical engineering , analytical chemistry (journal) , mineralogy , composite material , chemistry , chromatography , polymer , nanotechnology , organic chemistry , engineering
Glasses of composition x M 2 O:(1‐ x )SiO 2 [M = Na, Li] with x = 0.15 and 0.2 have been prepared both by the melt‐quench and the sol‐gel methods. X‐ray photoelectron spectroscopy shows that with increasing sintering temperature the structure of gels approaches that of the melt‐quench glass but does not become identical even on heating above the glass transition temperature ( T g ). Phase separation occurs in gel much below T g , and before it evolves into the structure of melt‐quench glass. Thus phase separation is achieved more readily in sintered gels than in the corresponding melt‐quench glass.