In Situ ESEM Experiment Applied to the Description of Chemical Processes during Glass Elaboration

Podor, Renaud; Schuller, S.; Ravaux, Johann; Monteiro, A.; Boucetta, Hassiba; Delattre, Olivier; Nicoleau, Elodie; Régnier, E.

doi:10.1016/j.mspro.2014.10.015

Cited by 3 publications

(3 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The microscope used is a FEI QUANTA 200 ESEM FEG equipped with a heating stage (25-1500°C) (40), (41) and a measurement thermocouple of S type. The difference between the set and measured temperatures is estimated at 25°C between 600 and 800°C.…”

Section: In Situ Electron Microscopymentioning

confidence: 99%

Liquid-Liquid Phase Separation in Borosilicate Glass Enriched in Moo3 – Experimental Investigations and Thermodynamic Calculations

Schuller

Benigni²,

Gossé³

et al. 2022

SSRN Journal

View full text Add to dashboard Cite

Section: In Situ Electron Microscopymentioning

confidence: 99%

Liquid-Liquid Phase Separation in Borosilicate Glass Enriched in Moo3 – Experimental Investigations and Thermodynamic Calculations

Schuller

Benigni²,

Gossé³

et al. 2022

SSRN Journal

View full text Add to dashboard Cite

“…In this paper, we used high-temperature environmental scanning electron microscopy (HT-ESEM) to obtain direct experimental evidence about the morphology evolution during the melting of nuclear waste feeds. [32][33][34] Thus far, such morphological analysis was limited to high-temperature in situ visual and X-ray observation methods, 26,29 each with their own advantages and drawbacks, or to ex-situ analysis of samples quenched to room temperature. 28 HT-ESEM allows us to directly observe, as a function of temperature, the microstructure and phase evolutions, including the formation of low-temperature liquids (eutectic salt melt and glass-forming borate melt), intermediate crystal phases, and the onset of foaming.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, we used high‐temperature environmental scanning electron microscopy (HT‐ESEM) to obtain direct experimental evidence about the morphology evolution during the melting of nuclear waste feeds 32–34 . Thus far, such morphological analysis was limited to high‐temperature in situ visual and X‐ray observation methods, 26,29 each with their own advantages and drawbacks, or to ex‐situ analysis of samples quenched to room temperature 28 .…”

Section: Introductionmentioning

confidence: 99%

Transient melt formation and its effect on conversion phenomena during nuclear waste vitrification – HT‐ESEM analysis

Pokorný,

Vernerová,

Kloužek

et al. 2023

J Am Ceram Soc.

View full text Add to dashboard Cite

Although the vitrification of nuclear waste has a decades‐long history, numerous opportunities still exist to improve its efficiency and to increase the waste loading in glass. This is especially true for the vitrification of low‐activity waste (LAW), which has been historically treated by other immobilization technologies and is less mature than high‐level waste (HLW) vitrification. In this work, we address one of the least understood phenomena during the conversion of nuclear waste feeds to glass—the formation of molten salt and transient glass‐forming melt. Using high‐temperature environmental scanning electron microscopy (HT‐ESEM) in combination with X‐ray diffraction, thermogravimetry, and evolved gas analysis, we have analyzed the complex chemical reactions and phase transitions as they occur during melting of representative HLW and LAW melter feeds. We evaluated the compositions of amorphous phases and the fractions of salt components, and estimated the fractions of molten salt phases present in the feeds as a function of temperature. We show that the maximum fraction of molten salts is ∼4 % and ∼28 % during HLW and LAW feed melting, respectively, and discuss the possibility of molten salt migration in LAW feeds. We also argue that the presence of significant fractions of molten salt phase can hinder the retention of rhenium (and, hence, radioactive technetium), and discuss how the properties of molten salt phase and transient glass‐forming melt are related to primary foam formation and behavior. Finally, we summarize key unanswered questions requiring further research to increase the understanding of the conversion process and enhance the nuclear waste vitrification efficiency.

show abstract

Liquid-liquid phase separation in borosilicate glass enriched in MoO3 – experimental investigations and thermodynamic calculations

Schuller

Benigni

Gossé

et al. 2023

Journal of Non-Crystalline Solids

View full text Add to dashboard Cite

In Situ ESEM Experiment Applied to the Description of Chemical Processes during Glass Elaboration

Cited by 3 publications

References 41 publications

Liquid-Liquid Phase Separation in Borosilicate Glass Enriched in Moo3 – Experimental Investigations and Thermodynamic Calculations

Liquid-Liquid Phase Separation in Borosilicate Glass Enriched in Moo3 – Experimental Investigations and Thermodynamic Calculations

Transient melt formation and its effect on conversion phenomena during nuclear waste vitrification – HT‐ESEM analysis

Liquid-liquid phase separation in borosilicate glass enriched in MoO3 – experimental investigations and thermodynamic calculations

Contact Info

Product

Resources

About