| 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 |
|
Lima, Maria Margarida Rolim Augusto
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (17/17 displayed)
- 2018Thermal characteristics and crystallization behavior of zinc borosilicate glasses containing Nb2O5citations
- 2016Formation and crystallization of zinc borosilicate glassescitations
- 2015Crystallization of lithium disilicate-based multicomponent glasses - effect of silica/lithia ratiocitations
- 2014Crystallization kinetics of a barium-zinc borosilicate glass by a non-isothermal methodcitations
- 2014Phase transformation and microstructural evolution after heat treatment of a terbium-doped lithium–aluminum phosphate glasscitations
- 2014Synthesis of Niobium Doped Zinc Borosilicate Glass-ceramics
- 2014Crystallization and microstructure of Eu3+-doped lithium aluminophosphate glasscitations
- 2014Glass transition and crystallization kinetics of a barium borosilicate glass by a non-isothermal methodcitations
- 2014A novel dental restorative glass-ceramic based on fluorcanasite
- 2013Rare-earth doped phosphate glasses
- 2013Crystallization kinetics terbium-doped aluminophosphate glass studied by DSC, XRD and SEM
- 2013Effect of Phosphogypsum on the Clinkerization Temperature of Portland Cement Clinkercitations
- 2012Sintering,Crystallization and Dielectric Behavior of Barium Zinc Borosilicate Glasses - Effect of Barium Oxide substitution for Zinc Oxidecitations
- 2012Structural, electrical and thermal properties of borosilicate glass-alumina compositescitations
- 2008Mechanical characteristics of clay structural ceramics containing coal fly ashcitations
- 2004Recycling of coal fly ash by ceramic processing
- 2000Pressureless sintering of alumina-glass compositescitations
Places of action
| Organizations | Location | People |
|---|
document
Crystallization kinetics terbium-doped aluminophosphate glass studied by DSC, XRD and SEM
Abstract
Crystallization kinetics and thermal transformation analysis were investigated for a transparent Tb-doped aluminophosphate glass, with a composition based on the system Tb2O3-Li2O-BaO-Al2O3-La2O3-P2O5, which was prepared by a wet non-conventional raw materials preparation method, followed by a melt-quenching process. The crystallization parameters (crystallization activation energy (Ec) and Avrami exponent (n)) were evaluated from the experimental data obtained by differential scanning calorimetry (DSC) performed at different heating rates. DSC curves exhibited an endothermic peak associated with the glass transition and an exothermic crystallization peak. The glass dependence of the transition (Tg) and of the crystallization (Tp) temperatures on the heating rate (b) were evaluated by Lasocka method. There was a close agreement between the values of the glass transition (Eg) and crystallization (Ec) activation energies determined by Kissinger, Moynihan and Ozawa methods. Considering the variation of the fraction of crystallization (c), 0.1 ≤ c ≤ 0.9, calculated from the thermal analysis experimental data for the exothermic peak, the value of activation energy (Ec(c)) slightly decreased from 360 to 310 kJ/mol, and the Avrami exponent (n(c)) varied from 0.85 to 1, suggesting a surface nucleation mechanism in the crystallization process. X-ray diffraction analysis (XRD) indicated the formation of a predominant aluminium metaphosphate phase, Al(PO3)3, that was present with some aluminium phosphate (AlPO4). Observation by scanning electron microscopy (SEM) of the microstructures of bulk glass samples, after heat-treatment at 600 ºC, revealed the presence of spherulitic-shaped crystals in the glass matrix and confirmed that crystallization was predominantly initiated from the surface of the samples.