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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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