Nanocrystal Growth in Cordierite Glass Ceramics Studied with X-ray Scattering

Bras, Wim; Clark, S. M.; Greaves, G. Neville; Kunz, Martin; Beek, Wouter van; Radmilović, Velimir

doi:10.1021/cg070562v

Cited by 16 publications

(13 citation statements)

References 32 publications

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“…Techniques such as synchrotron X‐ray scattering have yielded a great deal of insight into the crystallization mechanisms. For instance, the combined use of synchrotron X‐ray and neutron small angle scattering (SAXS and SANS), as well as X‐ray absorption fine structure (XAFS) have allowed elucidating the kinetics of nucleation and growth in a cordierite glass‐ceramic . It was found that in this system surface crystallization takes place first, as opposed to the usual bulk crystallization.…”

Section: Introductionmentioning

confidence: 99%

Nucleation and Growth of Nanocrystals in Glass‐Ceramics: An In Situ SANS Perspective

et al. 2012

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We studied the nucleation and growth of nano-sized crystals on two glass-ceramic systems: a conventional lithium-aluminosilicate (LAS) and a (Mg,Zn) spinel. We combined several techniques: in situ Small Angle Neutron Scattering (SANS), Differential Scanning Calorimetry (DSC), Scanning Electron Microscopy (SEM), and laboratory X-ray diffraction (XRD). We observed by SANS, and confirmed by DSC, that during a temperature ramp, transient phenomena occur between the regions of nucleation and growth in the LAS, which do not follow classic kinetic theories. In contrast, the spinel material shows a smooth transition during the temperature ramp between the nucleation and the growth stages, and follows a more conventional growth pattern. In the spinel system the initial phase separation plays a very important role in determining the crystalline phase distribution in the glassy matrix, as crystallites are confined only in one phase.W. Lee-contributing editor Manuscript No. 30287. J ournal aluminosilicate nucleated by TiO 2 alone. In both cases nucleation and crystallization mechanisms appear very complex, and involve three-phase immiscibility. In magnesium aluminosilicate, spinel crystallites form together with magnesium-aluminum-titanate. In zinc aluminosilicate the crystalline phases are gahnite (Zn-spinel) and two metastable forms of TiO 2 : anatase and brookite. Incidentally, we notice that these mechanisms are different than that observed in LAS glassceramics nucleated by TiO 2 alone, studied in Ref. (15). h

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Section: Introductionmentioning

confidence: 99%

Nucleation and Growth of Nanocrystals in Glass‐Ceramics: An In Situ SANS Perspective

et al. 2012

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“…Usually, the glass was subjected to a two-step thermal treatment to form homogeneous GCs. That is, the samples were first kept at a lower nucleation (or soak) temperature, and then at a higher crystal growth temperature [1,12]. In contrast, we treated our samples by a one-step annealing.…”

Section: Resultsmentioning

confidence: 99%

Highly efficient broadband near-infrared luminescence in Ni2+-doped glass ceramics films containing cordierite nanocrystals

Sun

Shimaoka

Ruan

et al. 2009

Journal of Non-Crystalline Solids

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“…The temperatures required are found by empirical means but in this way it is possible to create crystallites which from the onset are monodisperse and grow at the same rate till the later stages where either Ostwald ripening can take over or where the crystalline volume becomes space filling. Part of the results obtained have been published before [17,28] and will be only briefly summarised here. After that we focus here on some later insights and also show some later results.…”

Section: Chromium Containing Cordierite Glassmentioning

confidence: 99%

Influence of dopant metal ions on the formation of cordierite using combined SAXS/WAXS and EXAFS/WAXS techniques

Sankar

Dent

Dobson

et al. 2016

Journal of Non-Crystalline Solids

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Time-resolved combined scattering and spectroscopic techniques were used to understand in detail the formation of cordierite ceramic from two sources, (a) zeolite B and (b) cordierite glass systems. Time-resolved in situ combined EXAFS/XRD (at the Zn K-edge) investigation of the zinc oxide mixed zeolite B reveal that a series of transformations occur before the formation of cordierite ceramic. In particular the study revealed that addition of small amounts of zinc oxide promote the transformation of cordierite, through the formation of ZnAl2O4, at lower temperatures compared to the system without zinc oxide. Using in situ time-resolved SAXS/WAXS technique chromium doped in the cordierite glass system was investigated which revealed that, in addition to the formation of phase pure cordierite phase some amount of MgCr2O4 spinel phase are also produced.

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Nanocrystal Growth in Cordierite Glass Ceramics Studied with X-ray Scattering

Cited by 16 publications

References 32 publications

Nucleation and Growth of Nanocrystals in Glass‐Ceramics: An In Situ SANS Perspective

Nucleation and Growth of Nanocrystals in Glass‐Ceramics: An In Situ SANS Perspective

Highly efficient broadband near-infrared luminescence in Ni2+-doped glass ceramics films containing cordierite nanocrystals

Influence of dopant metal ions on the formation of cordierite using combined SAXS/WAXS and EXAFS/WAXS techniques

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