Effect of Al2O3 on phase separation and microstructure of R2O-B2O3-Al2O3-SiO2 glass system (R = Li, Na)

Kwinda, Tovhowani Innocent; Koppka, Sharon; Sander, Stephan; Enke, Dirk

doi:10.1016/j.jnoncrysol.2019.119849

Cited by 15 publications

(15 citation statements)

References 29 publications

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“…Thus, the increase of the band at 940 cm −1 is due to the presence of Si–O–Ti bonds of [TiO 4 ] units. Furthermore, so far there are no [TiO 6 ] species which might act as modifier cations similar to [AlO 6 ] in aluminium‐containing glasses 14 …”

Section: Resultsmentioning

confidence: 99%

“…This stems from the preferential formation of 2Na + [TiO 6 ] 2− or 2Na + [TiO 5 ] 2− units instead of [BO 4 ] − Na + and non‐bridging oxygens (NBOs) 6 . This behavior is similar to the mechanism of Al 2 O 3 in the alkali borosilicate glass system 14,15 . However, it is expected that in case of [TiO 4 ] units, the phase separation mechanism is not altered due to the absence of charge deficits.…”

Section: Introductionmentioning

confidence: 86%

“…A second endothermic peak situated around 740 • C is ascribed to subliquidus temperature (T L ) since it is also present in TiO 2 -free glasses and is close to the T L of NBS glass (755 ± 15 • C). 14,20,22 Therefore, the temperature range of phase separation (P s , P s = T L -T g ) is unaffected by TiO 2 addition. A third endothermic peak located around 1000 • C represents melting temperature (T m ) of cristobalite SiO 2 phase as verified in Figure S7 for titaniumfree glass.…”

Section: Thermal Propertiesmentioning

confidence: 99%

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Effect of TiO₂ on microphase development during phase separation and crystallization in Na₂O–B₂O₃–SiO₂ glass system

2021

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This study examines the incorporation of TiO2 into sodium borosilicate glasses and its effect on the formation of glassy and crystalline microphases. Glasses in the composition range: 7Na2O–23B2O3–(70 ‐ X)SiO2–XTiO2 (where X = 0–14.6 mol.% TiO2) which exhibit phase separation were investigated. Raman studies confirm the formation of two different TiO2 coordinations depending on the molar content of TiO2. Thermal properties of glasses are unaffected by TiO2 addition. The domain size of microphase development in TiO2‐containing glass indicates competition between phase separation and crystallization. Enrichment of titanium on the interphase between glassy microphases reduces the mass transfer and consequently limits the growth rate of glassy phases. This competes with the formation of anatase for which a nucleation‐controlled mechanism is proposed.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 86%

Section: Thermal Propertiesmentioning

confidence: 99%

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Effect of TiO₂ on microphase development during phase separation and crystallization in Na₂O–B₂O₃–SiO₂ glass system

2021

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“…Al 2 O 3 is a network intermediate oxide, Al 3+ can enter the glass network as [ AlO 4 ], making the structure compact; on the other hand, Al 3+ can also exist in the glass as [AlO 6 ], causing the depolymerization of the glass network and making the structure loose [7]. In partial systems, Al 3+ can also act as the element of partial crystal phases when the content of Al 2 O 3 is high [8]. Zhang et al [9,10] studied the influence of B 2 O 3 / Al 2 O 3 ratio and Al/Na ratio on BFS glass-ceramics, and indicated that Al 2 O 3 improved the thermal stability of glass, meanwhile, the crystallization activation energy and network structure were also affected with the change of Al 2 O 3 content.…”

Section: Introductionmentioning

confidence: 99%

STRUCTURE AND PROPERTIES OF GLASS-CERAMICS FROM BLAST FURNACE SLAG WITH DIFFERENT A l₂O₃/S iO₂ RATIO

Li¹

2021

Ceramics - Silikaty

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Different Al 2 O 3 /SiO 2 glass-ceramics were prepared from blast furnace slag by sintering method. The structure and properties of glasses or glass-ceramics were investigated by DSC, XRD, SEM, FTIR, 27 Al MAS NMR. The DSC results showed that with the increase of Al 2 O 3 /SiO 2 , the glass transition temperature (T g ) first decreased and then increased, reached the minimum when Al 2 O 3 /SiO 2 was 0.34. The volume density, bending strength and microhardness of glass-ceramics also showed the same variation rule. Structural analysis showed that when the Al 2 O 3 /SiO 2 increased from 0.19 to 0.34, Q 2 gradually transformed into Q 1 and Q 3 ; when the Al 2 O 3 /SiO 2 continued to increase from 0.34 to 0.39, Q 1 and Q 3 decreased while Q 2 increased. The variation of [AlO 4 ] and [AlO 6 ] made the glass network structure the loosest when Al 2 O 3 /SiO 2 was 0.34. Gehlenite was the main crystalline phase in glass-ceramics, and with the increase of Al 2 O 3 /SiO 2 , the precipitation of gehlenite increased, while the precipitation of diopside and hyalophane decreased.

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“…In partial systems, Al 3+ can also act as the element of partial crystal phases when the content of Al 2 O 3 is high [8]. Wentao Zhang et al studied the in uence of B 2 O 3 /Al 2 O 3 ratio and Al/Na ratio on BFS glassceramics, and indicated that Al 2 O 3 improved the thermal stability of glass, meanwhile, the crystallization activation energy and network structure were also affected with the change of Al 2 O 3 content [9,10].…”

Section: Introductionmentioning

confidence: 99%

Effect of Al2O3/SiO2 on the structure and properties of blast furnace slag glass-ceramics

Zhang

et al. 2020

Preprint

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Different Al2O3/SiO2 glass-ceramics were prepared from blast furnace slag by traditional sintering method. The structure and properties of glasses or glass-ceramics were investigated by DSC, XRD, SEM, FTIR, 27Al MAS NMR. The DSC results showed that with the increase of Al2O3/SiO2, the glass transition temperature (Tg) first increased and then decreased, reached the minimum when Al2O3/SiO2 was 0.34. The volume density, bending strength and microhardness of glass-ceramics also showed the same variation rule. The FTIR and 27Al MAS NMR spectra results revealed this phenomenon. When Al2O3/SiO2 was 0.19, a large amount of Si4+ was added to the glass network to make the structure dense. With Al2O3/SiO2 increased from 0.24 to 0.34, the amount of [AlO6] in the glass increased while [AlO4] decreased, and the degree of network polymerization of the glass decreased; as Al2O3/SiO2 further increased from 0.34 to 0.39, [AlO4] increased and [AlO6] decreased in the glass, and the degree of network polymerization of the glass increased. The XRD results showed that the crystal phase of the glass-ceramics was composed of gehlenite, diopside and hyalophane. Moreover, with the increase of Al2O3/SiO2, the gehlenite content in the glass-ceramics increased, while the content of diopside and hyalophane decreased.

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Effect of Al2O3 on phase separation and microstructure of R2O-B2O3-Al2O3-SiO2 glass system (R = Li, Na)

Cited by 15 publications

References 29 publications

Effect of TiO₂ on microphase development during phase separation and crystallization in Na₂O–B₂O₃–SiO₂ glass system

Effect of TiO₂ on microphase development during phase separation and crystallization in Na₂O–B₂O₃–SiO₂ glass system

STRUCTURE AND PROPERTIES OF GLASS-CERAMICS FROM BLAST FURNACE SLAG WITH DIFFERENT A l₂O₃/S iO₂ RATIO

Effect of Al2O3/SiO2 on the structure and properties of blast furnace slag glass-ceramics

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Effect of Al2O3 on phase separation and microstructure of R2O-B2O3-Al2O3-SiO2 glass system (R = Li, Na)

Cited by 15 publications

References 29 publications

Effect of TiO2 on microphase development during phase separation and crystallization in Na2O–B2O3–SiO2 glass system

Effect of TiO2 on microphase development during phase separation and crystallization in Na2O–B2O3–SiO2 glass system

STRUCTURE AND PROPERTIES OF GLASS-CERAMICS FROM BLAST FURNACE SLAG WITH DIFFERENT A l₂O₃/S iO₂ RATIO

Effect of Al2O3/SiO2 on the structure and properties of blast furnace slag glass-ceramics

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Product

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Effect of TiO₂ on microphase development during phase separation and crystallization in Na₂O–B₂O₃–SiO₂ glass system

Effect of TiO₂ on microphase development during phase separation and crystallization in Na₂O–B₂O₃–SiO₂ glass system