Structural relaxation mechanisms in hydrous sodium borosilicate glasses

Behrens, Harald; Bauer, Ute; Reinsch, Stefan; Kiefer, P.; Müller, Ralf; Deubener, Joachim

doi:10.1016/j.jnoncrysol.2018.05.025

Cited by 19 publications

(9 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The temperature was controlled with an S-type thermocouple (Pt-PtRh) placed at ~2 mm from the sample surface. The temperature error is estimated at ±5 °C considering the accuracy of the S-type thermocouple and its distance from the sample 194 . We followed standard procedures 195 to achieve thermal equilibration of the sample at the target measuring temperature: a heating rate of 0.17 K s −1 (10 K min −1 ) was imposed up to 100 °C less than the desired temperature, which was then approached with a slower heating rate of 0.08 K s −1 (5 K min −1 ).…”

Section: Methodsmentioning

confidence: 99%

A chemical threshold controls nanocrystallization and degassing behaviour in basalt magmas

Scarani

Zandonà

Fiore

et al. 2022

Commun Earth Environ

View full text Add to dashboard Cite

An increasing number of studies are being presented demonstrating that volcanic glasses can be heterogeneous at the nanoscale. These nano-heterogeneities can develop both during viscosity measurements in the laboratory and during magma eruptions. Our multifaceted study identifies here total transition metal oxide content as a crucial compositional factor governing the tendency of basalt melts and glasses towards nanolitization: at both anhydrous and hydrous conditions, an undercooled trachybasalt melt from Mt. Etna readily develops nanocrystals whose formation also hampers viscosity measurements, while a similar but FeO- and TiO2-poorer basalt melt from Stromboli proves far more stable at similar conditions. We therefore outline a procedure to reliably derive pure liquid viscosity without the effect of nanocrystals, additionally discussing how subtle compositional differences may contribute to the different eruptive styles of Mt. Etna and Stromboli.

show abstract

Section: Methodsmentioning

confidence: 99%

A chemical threshold controls nanocrystallization and degassing behaviour in basalt magmas

Scarani

Zandonà

Fiore

et al. 2022

Commun Earth Environ

View full text Add to dashboard Cite

show abstract

“…silicate or borosilicate glasses), it has been demonstrated that the presence of volatile species influences Tg. For instance, H2O provokes a dramatic decrease in Tg [26][27][28][29] whereas CO2 only weakly decreases Tg. 30,31 Currently, the effect of halogens on borosilicate glasses Tg is poorly understood.…”

Section: Introductionmentioning

confidence: 99%

The influence of iodide on glass transition temperature of high‐pressure nuclear waste glasses

et al. 2020

View full text Add to dashboard Cite

The glass transition temperature (T g) is a key parameter to investigate for application in nuclear waste immobilization in borosilicate glasses. T g for several glasses containing iodine (I) has been measured in order to determine the I effect on T g. Two series of glass composition (ISG and NH) containing up to 2.5 mol% I and synthesized under high pressure (0.5 to 1.5 GPa) have been investigated using differential scanning calorimetry (DSC). The I local environment in glasses has been determined using X-ray photoelectron spectroscopy and revealed that I is dissolved under its iodide form (I −). Results show that T g is decreased with the I addition in the glass in agreement with previous results. We also observed that this T g decrease is a strong function of glass composition. For NH, 2.5 mol% I induces a decrease of 24°C in T g , whereas for ISG, 1.2 mol% decreases the T g by 64°C. We interpret this difference as the result of the I dissolution mechanism and its effect on the polymerization of the boron network. The I dissolution in ISG is accompanied by a depolymerization of the boron network, whereas it is the opposite in NH. Although ISG corresponds to a standardized glass, for the particular case of I immobilization it appears less adequate than NH considering that the decrease in T g for NH is small in comparison to ISG.

show abstract

“…For this purpose, oxide glasses containing up to 8 wt% water were synthesized by melting at high pressure according to Behrens and Stuke (2003). In this way, water speciation and its influence on glass network structure could be investigated for numerous hydrous glasses including soda-lime-borate, sodium borosilicate (Bauer et al, 2017;Behrens et al, 2018), silicoborate (Balzer et al, 2019a), phosphate (Balzer et al, 2019b), and microscope slide glasses (Kiefer et al, 2019). Analogous studies on other soda-lime glasses have been published previously (Behrens and Stuke, 2003).…”

Section: Introductionmentioning

confidence: 87%

“…Water was also proved to increase internal friction as e.g., shown for low water bearing (<0.3 wt%) phosphate (Day and Stevels, 1974), sodium silicate and borate glasses (Day, 1974). More recently, internal friction studies on high water bearing (<8 wt%) soda-lime silicate glasses (Reinsch et al, 2013) and sodium borosilicate glasses (Behrens et al, 2018) demonstrated that water strongly affects the temperature range and the intensity of sub-T g relaxation.…”

Section: Introductionmentioning

confidence: 89%

Crack Growth in Hydrous Soda-Lime Silicate Glass

et al. 2020

View full text Add to dashboard Cite

Stable crack growth was measured for nominal dry and water-bearing (6 wt%) soda-lime silicate glasses in double cantilever beam geometry and combined with DMA studies on the effects of dissolved water on internal friction and glass transition, respectively. In vacuum, a decreased slope of logarithmic crack growth velocity versus stress intensity factor is evident for the hydrous glass in line with an increase of β-relaxation intensity indicating more energy dissipation during fracture. Further, inert crack growth in hydrous glass is found to be divided into sections of different slope, which indicates different water related crack propagation mechanism. In ambient air, a largely extended region II is observed for the hydrous glass, which indicates that crack growth is more sensitive to ambient water.

show abstract

Structural relaxation mechanisms in hydrous sodium borosilicate glasses

Cited by 19 publications

References 62 publications

A chemical threshold controls nanocrystallization and degassing behaviour in basalt magmas

A chemical threshold controls nanocrystallization and degassing behaviour in basalt magmas

The influence of iodide on glass transition temperature of high‐pressure nuclear waste glasses

Crack Growth in Hydrous Soda-Lime Silicate Glass

Contact Info

Product

Resources

About