Phase separation in the glasses of the (8–x)Na2O · xFe2O3 · 22B2O3 · 70SiO2 system

Glasses with the (8– x )Na 2 O · x Fe 2 O 3 ∙ 22B 2 O 3 ∙ 70SiO 2 compositions, where the Fe 2 O 3 content varies from 2 to 6 mol %, which were heat-treated at the temperatures of 550 and 700°С for 144 and 2 h, respectively, have been studied by dilatometry, electron microscopy, and X-ray powder dif...

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Bibliographic Details
Published in:Glass physics and chemistry 2016-11, Vol.42 (6), p.631-634
Main Authors: Konon, M. Yu, Stolyar, S. V., Polyakova, I. G., Drozdova, I. A., Kurilenko, L. N.
Format: Article
Language:English
Subjects:
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Composites
Glass
Materials Science
Natural Materials
Physical Chemistry
Short Communication
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Summary:Glasses with the (8– x )Na 2 O · x Fe 2 O 3 ∙ 22B 2 O 3 ∙ 70SiO 2 compositions, where the Fe 2 O 3 content varies from 2 to 6 mol %, which were heat-treated at the temperatures of 550 and 700°С for 144 and 2 h, respectively, have been studied by dilatometry, electron microscopy, and X-ray powder diffractometry. It has been shown that, with an increase in the total concentration of Fe 2 O 3 in the glass, there is a trend to the transition from an interconnected to a droplet-matrix phase-separated structure. The crystal line phases of Fe 3 O 4 , FeSiO 3 , and β-Fe 2 O 3 are formed depending on composition, while the latter is observed only in the glass with the equivalent contents of Na 2 O and Fe 2 O 3 . There is a minimum on the glass transition temperature dependence of the composition at equimolar (4 mol %) contents of Na 2 O and Fe 2 O 3 .
ISSN:1087-6596
1608-313X
DOI:10.1134/S1087659616060109