| People | Locations | Statistics |
|---|---|---|
| Naji, M. |
| |
| Motta, Antonella |
| |
| Aletan, Dirar |
| |
| Mohamed, Tarek |
| |
| Ertürk, Emre |
| |
| Taccardi, Nicola |
| |
| Kononenko, Denys |
| |
| Petrov, R. H. | Madrid |
|
| Alshaaer, Mazen | Brussels |
|
| Bih, L. |
| |
| Casati, R. |
| |
| Muller, Hermance |
| |
| Kočí, Jan | Prague |
|
| Šuljagić, Marija |
| |
| Kalteremidou, Kalliopi-Artemi | Brussels |
|
| Azam, Siraj |
| |
| Ospanova, Alyiya |
| |
| Blanpain, Bart |
| |
| Ali, M. A. |
| |
| Popa, V. |
| |
| Rančić, M. |
| |
| Ollier, Nadège |
| |
| Azevedo, Nuno Monteiro |
| |
| Landes, Michael |
| |
| Rignanese, Gian-Marco |
|
Hess, Kai-Uwe
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2024The glass transition temperature of anhydrous amorphous calcium carbonate
- 2024The glass transition temperature of anhydrous amorphous calcium carbonatecitations
- 2023Glass transition temperatures and crystallization kinetics of a synthetic, anhydrous, amorphous calcium-magnesium carbonatecitations
- 2022The glass transition and the non-Arrhenian viscosity of carbonate meltscitations
- 2022The glass transition and the non-Arrhenian viscosity of carbonate meltscitations
- 2018The physico-chemical properties of volcanic ash: Does size matter?
- 2016Raman spectra of Martian glass analogues: A tool to approximate their chemical compositioncitations
- 2016Models for the estimation of Fe 3+ /Fe tot ratio in terrestrial and extraterrestrial alkali- and iron-rich silicate glasses using Raman spectroscopykcitations
- 2015Eruption and emplacement timescales of ignimbrite super-eruptions from thermo-kinetics of glass shards
- 2013The influence of thermal-stressing (up to 1000 °C) on the physical, mechanical, and chemical properties of siliceous-aggregate, high-strength concretecitations
Places of action
| Organizations | Location | People |
|---|
article
The glass transition and the non-Arrhenian viscosity of carbonate melts
Abstract
<jats:title>Abstract</jats:title><jats:p>We report the first calorimetric observation of the glass transition for a carbonate melt. A carbonate glass [55K2CO3–45MgCO3 (molar)] was quenched from 780 °C at 0.1 GPa. The activation energy of structural relaxation close to the glass transition was derived through a series of thermal treatments comprising excursions across the glass transition at different heating rates. Viscosities just above the glass transition temperature were obtained by applying a shift factor to the calorimetric results. These viscosity measurements (in the range of 109 Pa·s) at supercooled temperatures (ca. 230 °C) dramatically extend the temperature range of data for carbonates, which were previously restricted to super-liquidus viscosities well below 1 Pa·s. Combining our calorimetrically derived results with published alkaline-earth carbonate melt viscosities at high temperatures yields a highly non-Arrhenian viscosity-temperature relationship and confirms that carbonate liquids are “fragile.” Based on simulations, fragile behavior is also exhibited by Na2CO3 melt. In both cases, the fragility presumably relates to the formation of temperature-dependent low-dimensional structures and Vogel-Fulcher-Tammann (VFT) curves adequately describe the viscosity-temperature relationships of carbonate melts below 1000 °C.</jats:p>