Ultra-high thermal expansion glass–ceramics in the system MgO/Al2O3/TiO2/ZrO2/SiO2 by volume crystallization of cristobalite

Hunger, Anja; Carl, G.; Gebhardt, Andreas; Rüssel, Christian

doi:10.1016/j.jnoncrysol.2008.09.001

Cited by 67 publications

(49 citation statements)

References 11 publications

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“…This transformation is accelerated at higher temperatures13. Bulk crystallization may be induced by additives such as TiO 2 14151617, ZrO 2 123451819 or both2021 which act as nucleating agents.…”

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confidence: 99%

Surface Crystallization of a MgO/Y2O3/SiO2/Al2O3/ZrO2 Glass: Growth of an Oriented β-Y2Si2O7 Layer and Epitaxial ZrO2

Wisniewski

Seidel

Patzig

et al. 2017

Sci Rep

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The crystallization behavior of a glass with the composition 54.7 SiO2·10.9 Al2O3·15.0 MgO·3.4 ZrO2·16.0 Y2O3 is studied using X-ray diffraction (XRD), scanning electron microscopy (SEM) including electron backscatter diffraction (EBSD) and (scanning) transmission electron microscopy [(S)TEM] including energy-dispersive X-ray spectrometry (EDXS). This glass shows the sole surface crystallization of four different yttrium silicates of the composition Y2Si2O7 (YS). The almost simultaneous but independent nucleation of α-, β-, δ-, and ε-YS at the surface is followed by growth into the bulk, where ε-YS quickly dominates a first crystallized layer. An accumulation of Mg at the growth front probably triggers a secondary nucleation of β-YS, which forms a thin compact layer before fragmenting into a highly oriented layer of fine grained crystals occupying the remaining bulk. The residual glass between the YS growth structures allows the crystallization of indialite, yttrium stabilized ZrO2 (Y-ZrO2) and very probably μ-cordierite during cooling. Hence, this glass basically shows the inverted order of crystallization observed in other magnesium yttrium alumosilicate glasses containing less Y2O3. An epitaxial relationship between Y-ZrO2 and ε-YS is proven and multiple twinning relationships occur in the YS phases.

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Surface Crystallization of a MgO/Y2O3/SiO2/Al2O3/ZrO2 Glass: Growth of an Oriented β-Y2Si2O7 Layer and Epitaxial ZrO2

Wisniewski

Seidel

Patzig

et al. 2017

Sci Rep

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“…These compounds act as nucleating agents and enable the bulk crystallization of nano-sized quartz solid solutions [28].…”

Section: Year Old Samples Of the Gm 30870 Meltmentioning

confidence: 99%

Analysis of the cordierite X-phase and phase transformation by electron backscatter diffraction (EBSD)

Wisniewski

Rüssel

2014

Journal of Non-Crystalline Solids

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“…Summary of data on IR spectral frequencies of PbO-As 2 O 3 glasses crystallized with TiO 2 . Sample 1 (cm À1 ) 2 (cm À1 ) 3 (cm À1 ) 4 (cm À1 ) PbO 4 TiO 6 units T 0 1042 616 797 499 459 --T 2 1045 619 800 502 460 747 660 T 4 1051 620 802 505 460 750 657 T 6 1053 622 805 508 463 752 655 T 8 1056 625 807 511 464 756 653 T 10 1059 626 809 514 464 760 651 Philosophical Magazine 2267 crystals act as heterogeneous nuclei for the crystallization of the remaining glass. The diffraction patterns indicate that the concentration of arsenic ions with As 5þ oxidation state diminish with increasing concentration of TiO 2 .…”

Section: Philosophical Magazine 2265mentioning

confidence: 99%

“…Of the various crystallizing agents, titanium oxide is easily miscible in the glassy matrix at high temperatures. The presence of small quantities of TiO 2 in the glass matrices enhances the glassforming ability and chemical durability of the glasses [3][4][5]. Previously, this oxide was considered a nucleating agent for crystallization in silicate glasses.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic investigations on PbO–As₂O₃glasses crystallized with TiO₂

Gavvalapalli

Satyanarayana

Kumar

et al. 2009

Philosophical Magazine

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PbO-As 2 O 3 glasses mixed with different concentrations of TiO 2 (ranging from 0 to 1.0 mol%) were crystallized. The samples were characterized by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy (EDS) techniques. Studies were extended to optical absorption, IR, ESR, luminescence and magnetic susceptibility on these samples. The X-ray diffraction studies reveal the presence of Pb 3 O 4 , Ti(As 2 O 7 ), Pb(As 2 O 6 ), Pb 3 (AsO 4 ) 2 PbTi 3 O 7 and Ti 2 O 3 crystal phases. The optical absorption studies together with ESR and magnetic susceptibility measurements indicated that the titanium ions exist in both Ti 3þ and Ti 4þ states in all the samples and there is an increase in titanium ions in the trivalent state with increasing concentration of nucleating agent TiO 2 . The quantitative analysis of these results indicated that there is a growing degree of disorder in the glass network with increasing concentration of the crystallizing agent. The luminescence studies indicated that the samples crystallized with low concentrations of TiO 2 show high luminescence efficiency in the visible region.

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Ultra-high thermal expansion glass–ceramics in the system MgO/Al2O3/TiO2/ZrO2/SiO2 by volume crystallization of cristobalite

Cited by 67 publications

References 11 publications

Surface Crystallization of a MgO/Y2O3/SiO2/Al2O3/ZrO2 Glass: Growth of an Oriented β-Y2Si2O7 Layer and Epitaxial ZrO2

Surface Crystallization of a MgO/Y2O3/SiO2/Al2O3/ZrO2 Glass: Growth of an Oriented β-Y2Si2O7 Layer and Epitaxial ZrO2

Analysis of the cordierite X-phase and phase transformation by electron backscatter diffraction (EBSD)

Spectroscopic investigations on PbO–As₂O₃glasses crystallized with TiO₂

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Ultra-high thermal expansion glass–ceramics in the system MgO/Al2O3/TiO2/ZrO2/SiO2 by volume crystallization of cristobalite

Cited by 67 publications

References 11 publications

Surface Crystallization of a MgO/Y2O3/SiO2/Al2O3/ZrO2 Glass: Growth of an Oriented β-Y2Si2O7 Layer and Epitaxial ZrO2

Surface Crystallization of a MgO/Y2O3/SiO2/Al2O3/ZrO2 Glass: Growth of an Oriented β-Y2Si2O7 Layer and Epitaxial ZrO2

Analysis of the cordierite X-phase and phase transformation by electron backscatter diffraction (EBSD)

Spectroscopic investigations on PbO–As2O3glasses crystallized with TiO2

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Spectroscopic investigations on PbO–As₂O₃glasses crystallized with TiO₂