Detail publikace

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.

Originální název

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

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

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.

Klíčová slova

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

Autoři

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.

Vydáno

1. 7. 2019

Nakladatel

Elsevier

Místo

Nizozemsko

ISSN

0896-8446

Periodikum

JOURNAL OF SUPERCRITICAL FLUIDS

Ročník

149

Číslo

1

Stát

Nizozemsko

Strany od

54

Strany do

63

Strany počet

10

URL

https://www.sciencedirect.com/science/article/pii/S089684461830771X

Plný text v Digitální knihovně

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"
}