Experimental Evidence of Self-Limited Growth of Nanocrystals in Glass

Bhattacharyya, Somnath; Bocker, Christian; Heil, Tobias; Jinschek, Joerg R.; Höche, Thomas; Rüssel, Christian; Kohl, Helmut

doi:10.1021/nl901283r

Cited by 146 publications

(110 citation statements)

References 16 publications

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“…When the viscosity of the layer is lower than that of the bulk, this leads to an increase in the crystal growth. When the viscosity of the layer increases, the layer acts as a barrier and decelerates the crystal growth as reported earlier [40][41][42]44]. The glass transition temperatures of binary sodium silicate glasses containing 2 -5 mol % of Na 2 O, which is the supposed composition of the shell, are between 500 and 510 °C [36].…”

Section: Discussionsupporting

confidence: 54%

Structural analysis of Fe–Mn–O nanoparticles in glass ceramics by small angle scattering

Raghuwanshi

Harizanova

Tatchev

et al. 2015

Journal of Solid State Chemistry

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Magnetic nanocrystals containing Fe and Mn were obtained by annealing of silicate glasses with the composition 13.6Na 2 O-62.9SiO 2 -8.5MnO-15.0Fe 2 O 3-x (mol %) at 580 °C for different periods of time. Here, we present Small Angle Neutron Scattering using Polarized neutrons (SANSPOL) and Anomalous Small Angle X-ray Scattering (ASAXS) investigation on these glass ceramic samples. Analysis of scattering data from both methods reveals the formation of spherical core-shell type of nanoparticles with mean sizes between 10 nm and 100 nm. ASAXS investigation shows the particles have higher concentration of iron atoms and the shell like region surrounding the particles is enriched in SiO 2 . SANSPOL investigation shows the particles are found to be magnetic and are surrounded by a nonmagnetic shell-like region.

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Section: Discussionsupporting

confidence: 54%

Structural analysis of Fe–Mn–O nanoparticles in glass ceramics by small angle scattering

Raghuwanshi

Harizanova

Tatchev

et al. 2015

Journal of Solid State Chemistry

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“…CaF 2 ) at various treating temperatures. As reported elsewhere, the formation of a viscous silica-enriched layer around the precipitated fluoride crystal was supposed [28] and was confirmed by transmission electron microscopy as well as electron-energy loss spectrometry [29]. The silica-rich layer then acts as a diffusion barrier that hinders the further growth of fluoride crystallites.…”

Section: Xrd Analysissupporting

confidence: 69%

Effect of substitution of SiO2 by CaO/CaF2 on structure and synthesis of transparent glass-ceramics containing CaF2 nanocrystals

Wang

Cheng

2015

J Mater Sci

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Oxyfluoride glass ceramics with varied composition in system SiO 2 -Al 2 O 3 -CaO-CaF 2 with fixed content of alumina were synthesized by isothermal heattreatment of melt-quenched glasses. The as-prepared glasses and glass-ceramics were characterized in thermodynamics, microstructure, crystalline phase, and morphology and optical properties. The results show that substitution of SiO 2 by CaO and/or CaF 2 leads to rupture of Si-O network and hence escalating disorder of glass structure. Glass transition temperature increases with substituting SiO 2 by CaO but decreases by CaF 2 . Depending on glass composition and treating temperature, the initial crystalline phase CaF 2 and the secondary phase anorthite can successively crystallized. Substitution of SiO 2 by CaO and/or CaF 2 may facilitate the precipitation of CaF 2 crystal but suppress the crystallization of anorthite. Transparent glass ceramic containing nanosized CaF 2 can be synthesized using glass with a molar ratio of SiO 2 to (CaO ? CaF 2 ) approaching 1.3 via heat-treatment close to the initial crystallization temperature. Elevating treating temperature improves the crystallization of CaF 2 but in return decreases transparency of the glass ceramics (GC).

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“…41,79 From this composition, Bhattacharyya et al 90 studied the mechanism by advanced analytical TEM techniques, including simulations, in which the formation of a 1 nm wide SiO 2 shell around the crystals is confirmed (Fig. 7).…”

mentioning

confidence: 95%

Nanocrystallisation in oxyfluoride systems: mechanisms of crystallisation and photonic properties

Pablos-Martín

Durán

Pascual

2012

International Materials Reviews

154

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Rare earth (RE) doped oxyfluoride glass ceramics possess interesting optical properties with applications in telecommunications and optoelectronics, such as solid state lasers, optical amplifiers, etc. These materials combine the transparency and mechanical and chemical resistance of aluminosilicate glasses with the low phonon energy and facile incorporation of RE ions in the fluoride crystals. The incorporation of RE ions in the crystalline phases enhances the laser emission intensity, a major property of these materials. Transparency is achieved when crystal size is in the nanometric scale, usually below 40 nm, which avoids light scattering. A strict control of the nucleation and crystal growth processes is therefore necessary which requires a deep knowledge of the crystallisation mechanisms. The great activity and publications in this field in the last decades merit a review providing a comparative study of the different nanoglass ceramic systems, their structural and optical characterisation and their main properties and applications. This is the objective of this review paper which includes 232 references. A general discussion on glass nucleation and crystallisation theories and more relevant crystallisation parameters and characterisation techniques are put forward in the first section of the review, focused on nanocrystallisation processes in oxyfluoride systems. In the second section, the principal RE doped glass ceramics are presented. After a general introduction about the luminescence processes, including up-and down-conversion, the behaviour of RE elements in glasses and crystals are discussed. Glass ceramic compositions have been divided as follows: glass ceramics with a glass composition following Wang and Ohwaki's oxyfluoride glass ceramic, 1 ; and glass ceramics with different matrix compositions, arranged by crystalline phases. Relevant properties, mainly optical and laser, are described in each system along with the most relevant applications of these materials.

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Experimental Evidence of Self-Limited Growth of Nanocrystals in Glass

Cited by 146 publications

References 16 publications

Structural analysis of Fe–Mn–O nanoparticles in glass ceramics by small angle scattering

Structural analysis of Fe–Mn–O nanoparticles in glass ceramics by small angle scattering

Effect of substitution of SiO2 by CaO/CaF2 on structure and synthesis of transparent glass-ceramics containing CaF2 nanocrystals

Nanocrystallisation in oxyfluoride systems: mechanisms of crystallisation and photonic properties

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