Publication detail

Sintering of gadolinia-doped ceria prepared by mechanochemical synthesis

MACA, K. CIHLÁŘ, J. ČÁSTKOVÁ, K. ZMEŠKAL, O. HADRABA, H.

Czech title

Slinování gadoliniem dopovaného CeO2 připraveného mechanochemickou syntézou

English title

Sintering of gadolinia-doped ceria prepared by mechanochemical synthesis

Type

journal article in Web of Science

Language

en

Original abstract

Gadolinia-doped ceria (GDC) ceramics were prepared by mechanochemical synthesis of ceria and gadolinia (10mol.%) powders with subsequent uniaxial pressing and pressureless sintering. The mechanochemical synthesis was conducted in an attritor with different dispersion media: neutral (distilled water), basic (aqueous solution of ammonia), acidic (aqueous solution of propionic acid), and non-polar medium (xylene with stearic acid). The effect of suspension composition and attritor milling time on the sintering behaviour and ionic conductivity of GDC was studied. An attritor milling time of 3 to 6 hours was evaluated as the optimum milling time from the viewpoint of further sintering behaviour. Longer milling times resulted in nanometre-sized powders, whose sintering behaviour deteriorated due to powder agglomeration. The appearance of agglomerates in the non-polar medium was reduced. The ionic conductivity of the samples was evaluated by impedance spectroscopy and correlated with their microstructure.

Czech abstract

V práci je popsán způsob přípravy iontově vodivé keramiky CeO2 + 10mol%Gd2O3 pomocí atritorového mletí směsi čistých oxidů v různých prostředích. Bylo prokázáno, že s rostoucí dobou mletí klesala velikost částic a při době mletí 48 hodin byly získány částice o velikosti cca 20nm. Na druhou stranu dlouhé doby mletí vedly k velkému stupni aglomerace prášků, což mělo negativní vliv na dosažené konečné hustoty těles po slinování. Bylo ukázáno, že s klesající hustotou těles klesala i jejich iontová vodivost. Jako nejslibnější z hlediska eliminace aglomerace při dlouhých dobách mletí se ukázalo mletí v prostředí nepolárního rozpouštědla.

English abstract

Gadolinia-doped ceria (GDC) ceramics were prepared by mechanochemical synthesis of ceria and gadolinia (10mol.%) powders with subsequent uniaxial pressing and pressureless sintering. The mechanochemical synthesis was conducted in an attritor with different dispersion media: neutral (distilled water), basic (aqueous solution of ammonia), acidic (aqueous solution of propionic acid), and non-polar medium (xylene with stearic acid). The effect of suspension composition and attritor milling time on the sintering behaviour and ionic conductivity of GDC was studied. An attritor milling time of 3 to 6 hours was evaluated as the optimum milling time from the viewpoint of further sintering behaviour. Longer milling times resulted in nanometre-sized powders, whose sintering behaviour deteriorated due to powder agglomeration. The appearance of agglomerates in the non-polar medium was reduced. The ionic conductivity of the samples was evaluated by impedance spectroscopy and correlated with their microstructure.

Keywords in Czech

Slinování, Iontová vodivost, Gadoliniem dopovaný CeO2

Keywords in English

Milling; Sintering; Ionic conductivity; Gadolinia-doped CeO2

RIV year

2007

Released

16.04.2007

Publisher

Elsevier Science

Location

THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND

ISSN

0955-2219

Journal

Journal of the European Ceramic Society

Volume

27

Number

13-15

Pages from–to

4345–4348

Pages count

4

BIBTEX


@article{BUT43990,
  author="Karel {Maca} and Jaroslav {Cihlář} and Klára {Částková} and Oldřich {Zmeškal} and Hynek {Hadraba},
  title="Sintering of gadolinia-doped ceria prepared by mechanochemical synthesis",
  journal="Journal of the European Ceramic Society",
  year="2007",
  volume="27",
  number="13-15",
  month="April",
  pages="4345--4348",
  publisher="Elsevier Science",
  address="THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND",
  issn="0955-2219"
}