Viscosity profiles of phosphate glasses through combined quasi-static and bob-in-cup methods

Parsons, Andrew J.; Sharmin, Nusrat; Shaharuddin, Sharifah Imihezri Syed; Marshall, Martyn

doi:10.1016/j.jnoncrysol.2014.10.014

Cited by 16 publications

(18 citation statements)

References 17 publications

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“…However, the trend followed with composition is expected to be similar even if the values may vary. As discussed in the work where these data are published [11], fragility results are somewhat unexpected. Lower network connectivity and thus a larger concentration of NBO together with a decrease in the phosphate chain length with increasing modifier content, would give rise to an increase of the kinetic fragility since it would take less time for the shorter chains to rearrange and relax.…”

Section: Kinetic Fragility and Fibre Drawing Abilitymentioning

confidence: 90%

“…The fragility values that are going to be discussed here in terms of the structural features have been calculated from experimental viscosity data as determined by rotation and quasi-static viscosity methods along the high and low temperature range, respectively [11]. The values are reproduced in Figure 9 for convenience.…”

Section: Kinetic Fragility and Fibre Drawing Abilitymentioning

confidence: 99%

“…But only a few works have been published about structural studies performed directly on the fibres due to the complexity of their determination [7]. More recently, several works have been published on the improvement of processing conditions for fibre drawing based on kinetic fragility determination [10,11], enhancing the important role of the structure to predict the behaviour of bioactive glasses during processing [12].…”

Section: Introductionmentioning

confidence: 99%

“…In a previous work, the thermal properties and the viscosity behaviour of these glasses were studied through combined quasistatic and rotation methods and the theoretical fibre drawing points and fragility of the glasses were determined [11].…”

Section: Introductionmentioning

confidence: 99%

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Structure–properties relationships in fibre drawing of bioactive phosphate glasses

et al. 2017

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New bioactive phosphate glasses suitable for continuous fibre production are investigated in this work. The structure of both bulk and fibres from Na 2 O-CaO-MgO-P 2 O 5 glasses has been studied by means of Raman and 31 P and 23 Na Nuclear Magnetic Resonance spectroscopies, and the structural results have been correlated with the mechanical properties of the fibres and the dissolution rate of the bulk glasses. It has been observed that the mechanical properties of the phosphate glass fibres are influenced by the glass network connectivity, whilst the dissolution rates are governed by the Q i speciation of the PO 4 units. As seen in previous studies, molar volume seems to play an important role in the fragility behaviour of phosphate glasses. Here, a lower molar volume resulting from the increase in the oxygen packing density, hinders the cooperative flow of the PO 4 units throughout the glass network and, therefore, causes a reduction in the kinetic fragility.

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Section: Kinetic Fragility and Fibre Drawing Abilitymentioning

confidence: 90%

Section: Kinetic Fragility and Fibre Drawing Abilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structure–properties relationships in fibre drawing of bioactive phosphate glasses

et al. 2017

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“…As material parameters, we have used T m ¼ 950 K (Ref. 19) and those provided by the manufacturer at room temperature (q ¼ 2700 kg m…”

Section: -9mentioning

confidence: 99%

Melt front propagation in dielectrics upon femtosecond laser irradiation: Formation dynamics of a heat-affected layer

García-Lechuga

Solı́s

Siegel

2016

Applied Physics Letters

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Several studies in dielectrics have reported the presence of a thin heat-affected layer underneath the ablation crater produced by femtosecond laser irradiation. In this work, we present a time-resolved microscopy technique that is capable of monitoring the formation dynamics of this layer and apply it to the study of a phosphate glass exposed to single pulses below the ablation threshold. A few nanoseconds after laser excitation, a melt front interface can be detected, which propagates into the bulk, gradually slowing down its speed. By means of image analysis combined with optical modeling, we are able to determine the temporal evolution of the layer thickness and its refractive index. Initially, a strong transient decrease in the refractive index is observed, which partially recovers afterwards. The layer resolidifies after approximately 1 μs after excitation, featuring a maximum thickness of several hundreds of nanometers.

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Phosphate Glasses

Parsons¹

2021

Encyclopedia of Glass Science, Technology, History, and Culture

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Viscosity profiles of phosphate glasses through combined quasi-static and bob-in-cup methods

Cited by 16 publications

References 17 publications

Structure–properties relationships in fibre drawing of bioactive phosphate glasses

Structure–properties relationships in fibre drawing of bioactive phosphate glasses

Melt front propagation in dielectrics upon femtosecond laser irradiation: Formation dynamics of a heat-affected layer

Phosphate Glasses

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