Kinetics and mechanism of crystallization of gehlenite glass pure and doped with Co2+, Eu3+, Cr3+ and Th4+
| Autor: | B. Prochowska-Klisch, A. Małecki, R. Gajerski, Stanisław Łabuś, Jan Obłąkowski |
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| Rok vydání: | 1997 |
| Předmět: |
Materials science
Mineralogy chemistry.chemical_element Activation energy engineering.material Condensed Matter Physics Electronic Optical and Magnetic Materials law.invention Avrami equation Chromium chemistry law Differential thermal analysis Materials Chemistry Ceramics and Composites engineering Physical chemistry Gehlenite Crystallization Europium Cobalt |
| Zdroj: | Journal of Non-Crystalline Solids. 212:55-58 |
| ISSN: | 0022-3093 |
| Popis: | The crystallization of glasses of gehlenite composition, 2CaO · Al2O3 · SiO2, pure and doped with 0.02 mol cobalt, europium, chromium and thorium per one mole of gehlenite, was studied using differential thermal analysis. The kinetics of crystallization of all examined glasses are described by the Avrami equation: α = 1 − exp(−ktn). The activation energy of the crystallization process of the undoped glass is 740 kJ/mol and the parameter n is equal to 1.5. The activation energies of crystallization of doped glasses are 645, 670, 680 and 800 kJ/mol and the parameters n are 1.21, 1.38, 1.41 and 1.54 for europium, thorium, cobalt and chromium as dopants, respectively. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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