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Further Studies on Thermal Evolution of Glass‐Forming Gels
Author(s) -
Montenero Angelo,
Ugozzoli Franco,
Schiroli Dino,
Gnappi Guglielmina,
Giori D. Camillo,
Pye L. David
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.tb06274.x
Subject(s) - silicate , iron oxide , materials science , silicate glass , phase (matter) , oxide , thermal , thermal treatment , mineralogy , chemical composition , chemical engineering , analytical chemistry (journal) , chemistry , metallurgy , composite material , thermodynamics , chromatography , physics , organic chemistry , engineering
Glasses of composition Na 2 O·2SiO 2 containing iron oxide are obtained by the gel technique. The results show that the iron atoms accelerate the formation of the glass, whereas when they are present in low percentage (∼2%), the temperature necessary to obtain the glass phase is higher. During heat treatment at 250°C, two silicates are formed: Na 2 SiO 3 and Na 4 SiO 4 . When the iron content is low, they change at 650°C into Na 2 Si 2 O 5 , but when the iron content is higher (∼6%), this silicate does not form and the system becomes vitreous.