Observation and practical implications of nano‐scale phase separation in aluminosilicate glass optical fibers

Cavillon, Maxime; Dragic, Peter D.; Greenberg, B.; Garofalini, Stephen H.; Ballato, John

doi:10.1111/jace.16099

Cited by 15 publications

(6 citation statements)

References 25 publications

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“…A measurement of 29 Si MAS NMR for the AS33 glass was used to confirm the coordination number of Si and to probe the nearest cation neighbors of these Q 4 Si atoms. NMR revealed two distinct peaks (Figure 3) at −91.4 and −108.2 ppm.…”

Section: Glassesmentioning

confidence: 99%

“…Our estimates of the endmembers (AS7 and AS62) would predict AS33 glass with 74% of Si atoms in the Si-rich phase, which is slightly higher than the NMR measurement, but within the expected range of uncertainty in the values derived from 29 Si NMR. It is also possible that attribution of Si to these two discrete environments is not strictly correct, as SiO x polyhedra having different numbers of Al neighbors exhibit a range of overlapping chemical shifts in 29 Si NMR, 55 and thus, the fitting results in Figure 3 do not capture additional Q 4 Si environments that would alter the fraction of Si atoms in the two phases. In spite of this possibility, fitting the 29 Si NMR data with additional peaks is unwarranted, considering the excellent signal to noise and resolution of the two 29 Si resonances.…”

Section: Glassesmentioning

confidence: 99%

“…[1][2][3] A crucial aspect in designing these materials is to understand and control the tendency of the SiO 2 -Al 2 O 3 system to phase separate during melt processing. For optical communications, phase separation must be avoided to minimize transmission losses, 4 while for glass-ceramic applications, the phase separation can be controlled and manipulated to obtain crystalline phases that improve material toughness.…”

Section: Introductionmentioning

confidence: 99%

“…I G U R E 329 Si magic-angle spinning nuclear magnetic resonance (MAS NMR) spectrum of the AS33 glass. Peaks at −91.4 and −108.2 ppm correspond to Q4 Si atoms with 3 and 1 Al next-nearest neighbors, respectively. Uncertainties in chemical shift and full width half maximum (FWHM) are on the order of ±0.5 ppm; uncertainties in peak area are approximately ±5%.…”

mentioning

confidence: 99%

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Revisiting metastable immiscibility in SiO₂–Al₂O₃: Structure and phase separation of supercooled liquids and glasses

et al. 2023

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Understanding and controlling liquid-liquid phase separation in aluminosilicates is crucial for optimizing glass properties. However, the metastable nature of aluminosilicates' phase separation has made it difficult to study experimentally, and uncertainty persists regarding the compositional and temperature extents of the miscibility gap. Here, we present new experimental evidence that suggests a consolute temperature between 1440 and 1590 • C and endmember compositions of 7 and 62 mol.% Al 2 O 3 for the phase-separated glasses. Using containerless melt processing, deeply supercooled liquids over the 0-60 mol.% Al 2 O 3 range are probed with in situ small-and wide-angle X-ray scattering, which simultaneously reveals changes in nanoscale density heterogeneity and atomic structure. Correlations between phase separation and atomic coordination environments are compared for liquids and glasses. Pair distribution function analysis shows mean O-(Si + Al) coordination increases with Al 2 O 3 content and decreases with temperature.

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Section: Glassesmentioning

confidence: 99%

Section: Glassesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Revisiting metastable immiscibility in SiO₂–Al₂O₃: Structure and phase separation of supercooled liquids and glasses

et al. 2023

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“…Numerical tools are also under development to simulate the formation of the nanoparticles. For instance, molecular dynamics allow simulating the formation of phase-separated nanoparticles in oxide [68], aluminosilicate [69], and oxyfluoride [70] glass optical fibers. Reviews on the preparation methods and properties of transparent glass-ceramics can be found in [71,72].…”

Section: Preparation Of Particle-containing Glassesmentioning

confidence: 99%

Nano-Structured Optical Fibers Made of Glass-Ceramics, and Phase Separated and Metallic Particle-Containing Glasses

Veber

Vermillac

et al. 2019

Fibers

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For years, scientists have been looking for different techniques to make glasses perfect: fully amorphous and ideally homogeneous. Meanwhile, recent advances in the development of particle-containing glasses (PCG), defined in this paper as glass-ceramics, glasses doped with metallic nanoparticles, and phase-separated glasses show that these "imperfect" glasses can result in better optical materials if particles of desired chemistry, size, and shape are present in the glass. It has been shown that PCGs can be used for the fabrication of nanostructured fibers-a novel class of media for fiber optics. These unique optical fibers are able to outperform their traditional glass counterparts in terms of available emission spectral range, quantum efficiency, non-linear properties, fabricated sensors sensitivity, and other parameters. Being rather special, nanostructured fibers require new, unconventional solutions on the materials used, fabrication, and characterization techniques, limiting the use of these novel materials. This work overviews practical aspects and progress in the fabrication and characterization methods of the particle-containing glasses with particular attention to nanostructured fibers made of these materials. A review of the recent achievements shows that current technologies allow producing high-optical quality PCG-fibers of different types, and the unique optical properties of these nanostructured fibers make them prospective for applications in lasers, optical communications, medicine, lighting, and other areas of science and industry.Made of glass, optical fibers inherited all positive and negative properties of this material. Glasses are easy and inexpensive to produce on any scale and in any shape, they can possess high chemical stability and mechanical strength, and have high transparency. However, they could hardly compete, for example, with crystalline materials in thermal conductivity, or rare-earth elements' absorption, emission cross-sections, and available transparency range. Recent advances in glass science showed that properties of this material can be significantly improved if some additional phases are formed or impregnated in the glass. In particular, advances have been achieved in the development of particle-containing glasses: glass-ceramic materials, glasses doped with metallic nanoparticles, and phase-separated glasses. To date, these particle-containing glasses have become quite common and actively used in case of the bulk materials, but are still rather new for fiber optics.The purpose of this review is to summarize recent advances in the fabrication of structured fibers made of particle-containing glasses, their potential benefits, their actual properties, and their potential applications. The review covers three types of particle-containing glasses (PCG): crystalline dielectric particles, i.e., glass-ceramics; metallic nanoparticles (MeNPs); and dielectric amorphous particles, i.e., phase-separated glasses.First, we consider properties of the PCG bulk materials, their potenti...

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Nanoparticle doping and molten-core methods towards highly thulium-doped silica fibers for 0.79 μm-pumped 2 μm fiber lasers – A fluorescence lifetime study

Vařák,

Leich,

Kamrádek

et al. 2024

Journal of Luminescence

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Observation and practical implications of nano‐scale phase separation in aluminosilicate glass optical fibers

Cited by 15 publications

References 25 publications

Revisiting metastable immiscibility in SiO₂–Al₂O₃: Structure and phase separation of supercooled liquids and glasses

Revisiting metastable immiscibility in SiO₂–Al₂O₃: Structure and phase separation of supercooled liquids and glasses

Nano-Structured Optical Fibers Made of Glass-Ceramics, and Phase Separated and Metallic Particle-Containing Glasses

Nanoparticle doping and molten-core methods towards highly thulium-doped silica fibers for 0.79 μm-pumped 2 μm fiber lasers – A fluorescence lifetime study

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Observation and practical implications of nano‐scale phase separation in aluminosilicate glass optical fibers

Cited by 15 publications

References 25 publications

Revisiting metastable immiscibility in SiO2–Al2O3: Structure and phase separation of supercooled liquids and glasses

Revisiting metastable immiscibility in SiO2–Al2O3: Structure and phase separation of supercooled liquids and glasses

Nano-Structured Optical Fibers Made of Glass-Ceramics, and Phase Separated and Metallic Particle-Containing Glasses

Nanoparticle doping and molten-core methods towards highly thulium-doped silica fibers for 0.79 μm-pumped 2 μm fiber lasers – A fluorescence lifetime study

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Revisiting metastable immiscibility in SiO₂–Al₂O₃: Structure and phase separation of supercooled liquids and glasses

Revisiting metastable immiscibility in SiO₂–Al₂O₃: Structure and phase separation of supercooled liquids and glasses