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https://hdl.handle.net/20.500.14279/29988
Τίτλος: | Heat treatment induced phase transformations in zirconia and yttria-stabilized zirconia monolithic aerogels |
Συγγραφείς: | Torres-Rodríguez, Jorge Alberto Kalmár, József Menelaou, Melita Čelko, Ladislav Dvořak, Karel Cihlář, Jaroslav Kaiser, Jozef Győri, Enikő Veres, Péter Fabian, Istvan Lázár, István |
Major Field of Science: | Engineering and Technology |
Field Category: | Chemical Engineering |
Λέξεις-κλειδιά: | Aerogel;Heat treatment;Phase transformation;Yttria-stabilized zirconia;Zirconia |
Ημερομηνία Έκδοσης: | 1-Ιου-2019 |
Πηγή: | Journal of Supercritical Fluids, 2019, vol. 149, pp. 54 - 63 |
Volume: | 149 |
Start page: | 54 |
End page: | 63 |
Περιοδικό: | Journal of Supercritical Fluids |
Περίληψη: | Monolithic, structurally stable zirconia (ZrO2) aerogels can be used in high temperature applications and as medical implants. The macroscopic properties of these solids can be fine-tuned by the appropriate thermal treatment of the amorphous aerogels. Herein, we investigate the thermally induced phase transitions of ZrO2 and yttria-stabilized zirconia (YSZ) monolithic aerogels. All aerogels were produced by an acid-catalyzed sol-gel technique and subsequent supercritical drying (SCD). A complete reaction mechanism is proposed for the formation of the wet gel network. Also, the phase transformations taking place during calcination were followed as function of temperature by in-situ X-ray diffraction measurements. Composition and size of the forming crystallites were calculated from the XRD data. Phase transition is controlled by the temperature-dependent growth of crystallite size during calcination up to 1200 °C. Both tetragonal and monoclinic zirconia form in pure ZrO2 aerogels, and a single tetragonal phase forms in YSZ aerogels. |
URI: | https://hdl.handle.net/20.500.14279/29988 |
ISSN: | 08968446 |
DOI: | 10.1016/j.supflu.2019.02.011 |
Rights: | © Elsevier B.V. Attribution-NonCommercial-NoDerivatives 4.0 International |
Type: | Article |
Affiliation: | Brno University of Technology University of Debrecen MTA-DE Redox and Homogeneous Catalytic Reaction Mechanisms Research Group |
Publication Type: | Peer Reviewed |
Εμφανίζεται στις συλλογές: | Άρθρα/Articles |
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