Detail publikace

Synthesis and oxygen transport properties of La0.2Sr0.8Fe1.xTixO3.(x = 0.2, 0.4) intended for syn-gas production

BARTONÍČKOVÁ, E. WIIK, K. MACA, K. LEIN, H. RUDBERG, E.

Originální název

Synthesis and oxygen transport properties of La0.2Sr0.8Fe1.xTixO3.(x = 0.2, 0.4) intended for syn-gas production

Anglický název

Synthesis and oxygen transport properties of La0.2Sr0.8Fe1.xTixO3.(x = 0.2, 0.4) intended for syn-gas production

Jazyk

en

Originální abstrakt

Perovskites in the system La0.2Sr0.8Fe1-xTixO3-d exhibit high stability at severe reducing conditions and high temperatures. Due to favourable transport properties they are possible candidates both in oxygen permeation applications and anodes in SOFCs. Here we report the processing and oxygen transport properties of two different compositions: La0.2Sr0.8Fe1-xTixO3-d (x = 0.2, 0.4). Single phase powders were synthesized by both spray pyrolysis (SP) and solid state reaction (SSR). The resulting average particle sizes (BET) ranged from 140 nm (SP) to 1090 nm (SSR). Bar shaped samples were prepared by cold isostatic pressing and pressure less sintered between 1200 and 1250oC for 8-12 hours. Final sintered densities ranged from 97 (SSR) to 99% (SP) and grain size was less than 1.5 um. The average thermal expansion coefficients (TEC) varied in the range (13.8 - 14.6) .10-6K-1 at 300-600C and (21.3 - 28.9) .10-6K-1 at 600-800C. Surface exchange coefficients (kchem) and bulk diffusion coefficients (Dchem) in terms of temperature and pO2 were assessed by the method of electrical conductivity relaxation. A simple defect model was applied to explain electrical conductivity- and bulk diffusion behaviour.

Anglický abstrakt

Perovskites in the system La0.2Sr0.8Fe1-xTixO3-d exhibit high stability at severe reducing conditions and high temperatures. Due to favourable transport properties they are possible candidates both in oxygen permeation applications and anodes in SOFCs. Here we report the processing and oxygen transport properties of two different compositions: La0.2Sr0.8Fe1-xTixO3-d (x = 0.2, 0.4). Single phase powders were synthesized by both spray pyrolysis (SP) and solid state reaction (SSR). The resulting average particle sizes (BET) ranged from 140 nm (SP) to 1090 nm (SSR). Bar shaped samples were prepared by cold isostatic pressing and pressure less sintered between 1200 and 1250oC for 8-12 hours. Final sintered densities ranged from 97 (SSR) to 99% (SP) and grain size was less than 1.5 um. The average thermal expansion coefficients (TEC) varied in the range (13.8 - 14.6) .10-6K-1 at 300-600C and (21.3 - 28.9) .10-6K-1 at 600-800C. Surface exchange coefficients (kchem) and bulk diffusion coefficients (Dchem) in terms of temperature and pO2 were assessed by the method of electrical conductivity relaxation. A simple defect model was applied to explain electrical conductivity- and bulk diffusion behaviour.

Dokumenty

BibTex


@article{BUT47338,
  author="Eva {Bartoníčková} and Kjell {Wiik} and Karel {Maca} and Hilde L. {Lein} and Espen A. {Rudberg}",
  title="Synthesis and oxygen transport properties of La0.2Sr0.8Fe1.xTixO3.(x = 0.2, 0.4) intended for syn-gas production",
  annote="Perovskites in the system La0.2Sr0.8Fe1-xTixO3-d exhibit high stability at severe reducing conditions and high temperatures. Due to favourable transport properties they are possible candidates both in oxygen permeation applications and anodes in SOFCs. Here we report the processing and oxygen transport properties of two different compositions: La0.2Sr0.8Fe1-xTixO3-d (x = 0.2, 0.4). Single phase powders were synthesized by both spray pyrolysis (SP) and solid state reaction (SSR). The resulting average particle sizes (BET) ranged from 140 nm (SP) to 1090 nm (SSR). Bar shaped samples were prepared by cold isostatic pressing and pressure less sintered between 1200 and 1250oC for 8-12 hours. Final sintered densities ranged from 97 (SSR) to 99% (SP) and grain size was less than 1.5 um. The average thermal expansion coefficients (TEC) varied in the range (13.8 - 14.6) .10-6K-1 at 300-600C and (21.3 - 28.9) .10-6K-1 at 600-800C. Surface exchange coefficients (kchem) and bulk diffusion coefficients (Dchem) in terms of temperature and pO2 were assessed by the method of electrical conductivity relaxation. A simple defect model was applied to explain electrical conductivity- and bulk diffusion behaviour.",
  address="ELSEVIER SCI LTD",
  chapter="47338",
  institution="ELSEVIER SCI LTD",
  journal="Journal of the European Ceramic Society",
  number="2",
  volume="30",
  year="2009",
  month="october",
  pages="605--611",
  publisher="ELSEVIER SCI LTD",
  type="journal article in Web of Science"
}