Detail VaV (43990) ▪ FSI VUT v Brně

Český název

Slinování gadoliniem dopovaného CeO2 připraveného mechanochemickou syntézou

Anglický název

Sintering of gadolinia-doped ceria prepared by mechanochemical synthesis

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

en

Originální abstrakt

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.

Český abstrakt

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.

Anglický abstrakt

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.

Klíčová slova česky

Slinování, Iontová vodivost, Gadoliniem dopovaný CeO2

Klíčová slova anglicky

Milling; Sintering; Ionic conductivity; Gadolinia-doped CeO2

Rok RIV

2007

Vydáno

16.04.2007

Nakladatel

Elsevier Science

Místo

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

ISSN

0955-2219

Časopis

Journal of the European Ceramic Society

Ročník

27

Číslo

13-15

Strany od–do

4345–4348

Počet stran

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"
}