Characterizing the residual glass in a MgO/Al2O3/SiO2/ZrO2/Y2O3 glass-ceramic

The non-isochemical crystallization of glasses leads to glass-ceramics in which the chemical composition of the amorphous matrix differs from that of the parent glass. It is challenging to solely analyse the properties of these residual glassy phases because they frequently contain finely dispersed...

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Bibliographic Details
Published in:Scientific reports 2016-10, Vol.6 (1), p.34965-34965, Article 34965
Main Authors: Seidel, Sabrina, Patzig, Christian, Wisniewski, Wolfgang, Gawronski, Antje, Hu, Yongfeng, Höche, Thomas, Rüssel, Christian
Format: Article
Language:English
Subjects:
639/301
639/638
Ceramics
Chemical composition
Crystallization
Crystals
Humanities and Social Sciences
multidisciplinary
Nucleation
Scanning electron microscopy
Science
Silicates
Transmission electron microscopy
X-ray diffraction
Yttrium
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Summary:The non-isochemical crystallization of glasses leads to glass-ceramics in which the chemical composition of the amorphous matrix differs from that of the parent glass. It is challenging to solely analyse the properties of these residual glassy phases because they frequently contain finely dispersed crystals. In this study, the composition of the residual glass matrix after the crystallization of a glass with the mol% composition 50.6 SiO 2  · 20.7 MgO · 20.7 Al 2 O 3  · 5.6 ZrO 2  · 2.4 Y 2 O 3 is analysed by scanning transmission electron microscopy (STEM) including energy dispersive X-ray analysis (EDXS). A batch of the residual glass with the determined composition is subsequently melted and selected properties are analysed. Furthermore, the crystallization behaviour of this residual glass is studied by X-ray diffraction, scanning electron microscopy including electron backscatter diffraction and STEM-EDXS analyses. The residual glass shows sole surface crystallization of indialite and multiple yttrium silicates while bulk nucleation does not occur. This is in contrast to the crystallization behaviour of the parent glass, in which a predominant bulk nucleation of spinel and ZrO 2 is observed. The crystallization of the residual glass probably leads to different crystalline phases when it is in contact to air, rather than when it is enclosed within the microstructure of the parent glass-ceramics.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep34965