Nucleation and Growth of Nanocrystals in Glass‐Ceramics: An <i>In Situ </i><scp>SANS</scp> Perspective

Fernandez-Martin, Cristina; Bruno, Giovanni; Crochet, Anne; Ovono, D. Ovono; Comte, Monique; Hennet, Louis

doi:10.1111/j.1551-2916.2012.05093.x

Cited by 25 publications

(14 citation statements)

References 22 publications

(39 reference statements)

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“…(b). This is consistent with the common glass to crystalline transition after heat treatment . The fast cooling rate as shown in Fig.…”

Section: Resultssupporting

confidence: 89%

Nanoscaled Interface Between Microgold Particles and Biphase Glass‐Ceramic Matrix

Ichim

et al. 2013

J. Am. Ceram. Soc.

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This article presents a detailed study on the nanoscaled interface between microelongated gold particles (GP) and biphase leucite/feldspar glass-ceramic matrix. The glass-ceramic composite with a nonuniform GP distribution was processed through hot-pressing under vacuum using a commercial dental ceramic furnace for glass-ceramic dental crown manufacturing. Heat treatments at 900°C, 1100°C, and 1300°C were conducted, and microstructural features along the interface were used to verify the chemical reactions between GP and glass-ceramic matrix. It was observed that the amorphous glass-ceramic matrix had nanoscaled biphase structures, and the distributed nanoscaled amorphous leucite phase was attracted to GP during hot-pressing, and was more reactive with GP than the feldspar phase. The thickness of the interfacial phase formed through chemical reactions between GP and glass-ceramic matrix is around 30 nm. The chemically bonded interface has contributed significantly toward the substantial improvements in both strength and toughness of the GP-reinforced glass-ceramic matrix composite. Characterization techniques, including X-ray diffraction and field-emission scanning electron Microscopy, incorporating X-ray microanalysis using energy dispersive spectrometry, have been employed in this study.

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“…(b). This is consistent with the common glass to crystalline transition after heat treatment . The fast cooling rate as shown in Fig.…”

Section: Resultssupporting

confidence: 89%

Nanoscaled Interface Between Microgold Particles and Biphase Glass‐Ceramic Matrix

Ichim

et al. 2013

J. Am. Ceram. Soc.

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“…Nevertheless, although a number of studies delivered considerable insights into aspects of nucleation in LAS glasses in recent years 20–24 , the complex mechanisms of the crystallisation of nucleation agents and the subsequent growth of the crystalline LAS phases are still not fully understood 25 . In the past, we have shown that it is possible to determine and describe the crystallization mechanism of the nucleation agent ZrTiO 4 in LAS glass ceramics, with a combination of X-ray absorption near edge structure spectroscopy (XANES) and analytical transmission electron microscopy (TEM) 26 .…”

Section: Introductionmentioning

confidence: 99%

The formation of nanocrystalline ZrO2 nuclei in a Li2O-Al2O3-SiO2 glass – a combined XANES and TEM study

Kleebusch

Patzig

Krause

et al. 2017

Sci Rep

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The high economic importance of glass ceramics based on Li2O/Al2O3/SiO2 (LAS) is mainly due to their low coefficients of thermal expansion (CTE), which make these materials suitable candidates for a number of applications. The exact mechanism of the crystallization processes in LAS glasses is still not fully understood. The present work focuses on the formation and development of nanocrystalline ZrO2 within an LAS base composition which contains only ZrO2 as nucleating agent. Using a combination of transmission electron microscopy and X-ray absorption spectroscopy techniques, the temporal evolution of the ZrO2 nanocrystal formation is described. It is found that the formation of ZrO2 is initiated by liquid-liquid phase separation droplets with high Zr content, which eventually evolve into the nanocrystalline ZrO2 precipitations. This process is accompanied by a gradual change of the coordination of the tetravalent Zr ions from sixfold in the glass to eightfold in the crystals. The diameters of the ZrO2 crystals stay well below 4 nm, even at late stages. The degree of crystallization at each step of the crystallization process is deduced, and from that, the Avrami coefficient n is determined to be n ≈ 1, which describes a barrier-limited crystal growth process.

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“…Fe-Cu and Fe-Cu-B-N alloys 142 and the growth of nanocrystals in glass-ceramics 143 have all been investigated. A particular benefit of TR-SANS is the ability to separately visualize the organic template and the forming structure, both of which have a vital role in the growth mechanism.…”

Section: Time-resolved Sans (Tr-sans)mentioning

confidence: 99%

Practical applications of small-angle neutron scattering

Hollamby

2013

Phys. Chem. Chem. Phys.

120

116

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Recent improvements in beam-line accessibility and technology have led to small-angle neutron scattering (SANS) becoming more frequently applied to materials problems. SANS has been used to study the assembly, dispersion, alignment and mixing of nanoscale condensed matter, as well as to characterise the internal structure of organic thin films, porous structures and inclusions within steel.Using time-resolved SANS, growth mechanisms in materials systems and soft matter phase transitions can also be explored. This review is intended for newcomers to SANS as well as experts. Therefore, the basic knowledge required for its use is first summarised. After this introduction, various examples are given of the types of soft and hard matter that have been studied by SANS. The information that can be extracted from the data is highlighted, alongside the methods used to obtain it. In addition to presenting the findings, explanations are provided on how the SANS measurements were optimised, such as the use of contrast variation to highlight specific parts of a structure. Emphasis is placed on the use of complementary techniques to improve data quality (e.g. using other scattering methods) and the accuracy of data analysis (e.g. using microscopy to separately determine shape and size). This is done with a view to providing guidance on how best to design and analyse future SANS measurements on materials not listed below.

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

Cited by 25 publications

References 22 publications

Nanoscaled Interface Between Microgold Particles and Biphase Glass‐Ceramic Matrix

Nanoscaled Interface Between Microgold Particles and Biphase Glass‐Ceramic Matrix

The formation of nanocrystalline ZrO2 nuclei in a Li2O-Al2O3-SiO2 glass – a combined XANES and TEM study

Practical applications of small-angle neutron scattering

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