New insights into the crystallization of cordierite from a stoichiometric glass by in situ high-temperature SEM

Bocker, Christian; Kouli, Maher; Völksch, Günter; Rüssel, Christian

doi:10.1007/s10853-013-7984-3

Cited by 11 publications

(2 citation statements)

References 32 publications

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“…Many compositions in the MAS system predominantly show surface crystallization, for example that of cordierite9101112. By contrast, adding nucleating agents such as TiO 2 513141516 or ZrO 2 4678161718 may lead to bulk crystallization in MAS glasses.…”

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

Seidel

Patzig

Wisniewski

et al. 2016

Sci Rep

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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 SiO2 · 20.7 MgO · 20.7 Al2O3 · 5.6 ZrO2 · 2.4 Y2O3 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 ZrO2 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.

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confidence: 99%

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

Seidel

Patzig

Wisniewski

et al. 2016

Sci Rep

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“…[1][2][3][4][5][6][7] Since the MAS system tends to surface nucleation, [8][9][10][11] the addition of nucleating agents such as TiO 2 , 1,12-14 ZrO 2 2-7, 14-16 or both 17,18 is necessary to achieve bulk crystallization. If the glass contains high enough concentrations of these nucleation agents, during thermal treatment at temperatures slightly above T g , crystallization in these glasses is initiated by the formation of TiO 2 , ZrO 2 or ZrTiO 4 precipitations.…”

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confidence: 99%

The crystallization of MgO–Al₂O₃–SiO₂–ZrO₂glass-ceramics with and without the addition of Y₂O₃– a combined STEM/XANES study

et al. 2016

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Glasses with the mol% composition of 51.9 SiO 2 / 21.2 Al 2 O 3 / 21.2 MgO/ 5.7 ZrO 2 without and with the addition of 2.5 mol% Y 2 O 3 were melted and subsequently transformed into glass-ceramics via annealing. Both glass-ceramics show strong differences in the microstructure and in the phase composition after crystallization at 950 °C for 5 h and subsequently at 1060 °C for different annealing times. In the glass without Y 2 O 3 , the main crystal phase is a quartz solid solution accompanied by the precipitation of ZrO 2 and spinel. By contrast, glass-ceramics without the presence of a quartz solid solution were observed after the crystallization of the Y 2 O 3 -containing glass, using the same heat treatment. This is confirmed by analytical scanning transmission electron microscopy analysis and Xray absorption near-edge structure spectroscopy data gathered at the Zr L 2 -, Y L 2,3 -, Si K-and Al Ledges. Furthermore, using X-ray absorption spectroscopy the coordination of the respective elements is analysed, and changes of the coordination during crystallization are monitored.

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Influence of sintering pressure on the crystallization and mechanical properties of BN-MAS composite ceramics

et al. 2015

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New insights into the crystallization of cordierite from a stoichiometric glass by in situ high-temperature SEM

Cited by 11 publications

References 32 publications

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

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

The crystallization of MgO–Al₂O₃–SiO₂–ZrO₂glass-ceramics with and without the addition of Y₂O₃– a combined STEM/XANES study

Influence of sintering pressure on the crystallization and mechanical properties of BN-MAS composite ceramics

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New insights into the crystallization of cordierite from a stoichiometric glass by in situ high-temperature SEM

Cited by 11 publications

References 32 publications

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

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

The crystallization of MgO–Al2O3–SiO2–ZrO2glass-ceramics with and without the addition of Y2O3– a combined STEM/XANES study

Influence of sintering pressure on the crystallization and mechanical properties of BN-MAS composite ceramics

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Product

Resources

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The crystallization of MgO–Al₂O₃–SiO₂–ZrO₂glass-ceramics with and without the addition of Y₂O₃– a combined STEM/XANES study