Heat treatment induced phase transformations in zirconia and yttria-stabilized zirconia monolithic aerogels

Jorge Torres-Rodríguez, József Kalmár, Melita Menelaou, Ladislav Čelko, Karel Dvořak, Jaroslav Cihlář, Jaroslav Cihlař, Jozef Kaiser, Enikő Győri, Péter Veres, I. Fábián, István Lázár

Research output: Contribution to journalArticle

Abstract

Monolithic, structurally stable zirconia (ZrO 2 ) 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 ZrO 2 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 ZrO 2 aerogels, and a single tetragonal phase forms in YSZ aerogels.

Original languageEnglish
Pages (from-to)54-63
Number of pages10
JournalJournal of Supercritical Fluids
Volume149
DOIs
Publication statusPublished - Jul 1 2019

Fingerprint

Aerogels
Yttria stabilized zirconia
aerogels
yttria-stabilized zirconia
zirconium oxides
Zirconia
phase transformations
heat treatment
Phase transitions
Heat treatment
Calcination
roasting
gels
High temperature applications
Crystallite size
Crystallites
drying
crystallites
Sol-gels
zirconium oxide

Keywords

  • Aerogel
  • Heat treatment
  • Phase transformation
  • Yttria-stabilized zirconia
  • Zirconia

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

Cite this

Torres-Rodríguez, J., Kalmár, J., Menelaou, M., Čelko, L., Dvořak, K., Cihlář, J., ... Lázár, I. (2019). Heat treatment induced phase transformations in zirconia and yttria-stabilized zirconia monolithic aerogels. Journal of Supercritical Fluids, 149, 54-63. https://doi.org/10.1016/j.supflu.2019.02.011

Heat treatment induced phase transformations in zirconia and yttria-stabilized zirconia monolithic aerogels. / Torres-Rodríguez, Jorge; Kalmár, József; Menelaou, Melita; Čelko, Ladislav; Dvořak, Karel; Cihlář, Jaroslav; Cihlař, Jaroslav; Kaiser, Jozef; Győri, Enikő; Veres, Péter; Fábián, I.; Lázár, István.

In: Journal of Supercritical Fluids, Vol. 149, 01.07.2019, p. 54-63.

Research output: Contribution to journalArticle

Torres-Rodríguez, J, Kalmár, J, Menelaou, M, Čelko, L, Dvořak, K, Cihlář, J, Cihlař, J, Kaiser, J, Győri, E, Veres, P, Fábián, I & Lázár, I 2019, 'Heat treatment induced phase transformations in zirconia and yttria-stabilized zirconia monolithic aerogels', Journal of Supercritical Fluids, vol. 149, pp. 54-63. https://doi.org/10.1016/j.supflu.2019.02.011
Torres-Rodríguez, Jorge ; Kalmár, József ; Menelaou, Melita ; Čelko, Ladislav ; Dvořak, Karel ; Cihlář, Jaroslav ; Cihlař, Jaroslav ; Kaiser, Jozef ; Győri, Enikő ; Veres, Péter ; Fábián, I. ; Lázár, István. / Heat treatment induced phase transformations in zirconia and yttria-stabilized zirconia monolithic aerogels. In: Journal of Supercritical Fluids. 2019 ; Vol. 149. pp. 54-63.
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