Přístupnostní navigace
E-application
Search Search Close
Publication detail
TORRES RODRÍGUEZ, J. KALMÁR, J. MENELAOU, M. ČELKO, L. DVOŘÁK, K. CIHLÁŘ, J. CIHLÁŘ, J. KAISER, J. GYŐRI, E. VERES, P. FÁBIÁN, I. LÁZÁR, I.
Original Title
Heat treatment induced phase transformations in zirconia and yttriastabilized zirconia monolithic aerogels
Type
journal article in Web of Science
Language
English
Original Abstract
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.
Keywords
Aerogel, Zirconia, Yttria-stabilized zirconia, Heat treatment, Phase transformation
Authors
TORRES RODRÍGUEZ, J.; KALMÁR, J.; MENELAOU, M.; ČELKO, L.; DVOŘÁK, K.; CIHLÁŘ, J.; CIHLÁŘ, J.; KAISER, J.; GYŐRI, E.; VERES, P.; FÁBIÁN, I.; LÁZÁR, I.
Released
1. 7. 2019
Publisher
Elsevier
Location
Nizozemsko
ISBN
0896-8446
Periodical
JOURNAL OF SUPERCRITICAL FLUIDS
Year of study
149
Number
1
State
Kingdom of the Netherlands
Pages from
54
Pages to
63
Pages count
10
URL
https://www.sciencedirect.com/science/article/pii/S089684461830771X
Full text in the Digital Library
http://hdl.handle.net/11012/195642
BibTex
@article{BUT156507, author="Jorge Alberto {Torres Rodríguez} and József {Kalmár} and Melita {Menelaou} and Ladislav {Čelko} and Karel {Dvořák} and Jaroslav {Cihlář} and Jaroslav {Cihlář} and Jozef {Kaiser} and Enikő {Győri} and Péter {Veres} and István {Fábián} and István {Lázár}", title="Heat treatment induced phase transformations in zirconia and yttriastabilized zirconia monolithic aerogels", journal="JOURNAL OF SUPERCRITICAL FLUIDS", year="2019", volume="149", number="1", pages="54--63", doi="10.1016/j.supflu.2019.02.011", issn="0896-8446", url="https://www.sciencedirect.com/science/article/pii/S089684461830771X" }