Publication detail

Heat treatment induced phase transformations in zirconia and yttriastabilized zirconia monolithic aerogels

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"
}