Oxygen nonstoichiometry, thermo-chemical stability and crystal structure of La0.6Sr0.4CoO3-δ and La 0.6Sr0.4FeO3-δ

M. Kuhn, Kazuhisa Sato, Keiji Yashiro, J. Mizusaki, Shinichi Hashimoto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Oxygen nonstoichiometry and thermo-chemical stability of the perovskite mixed-conductors La0.6Sr0.4FeO3-δ and La0.6Sr0.4CoO3-δ were investigated by coulometric titration and high-temperature gravimetry in the oxygen partial pressure range of log(pO2/bar)=-28 to 0 at 773 to 1173 K. For both materials, the oxygen content decreased with decreasing oxygen partial pressure and increasing temperature. In the range log(pO2/bar)=-24 to -10, the oxygen content of La0.6Sr0.4FeO3-δ reached a plateau at δ=[Sr]/2=0.2, corresponding to stoichiometric composition. At lower oxygen partial pressure, the oxygen content further decreased and the material decomposed. La0.6Sr0.4CoO 3-δ was found to easily decompose already at higher oxygen partial pressure. The crystal structure of La0.6Sr 0.4FeO3-δ and La0.6Sr 0.4CoO3-δ was characterized by high-temperature X-ray diffraction in air as a function of temperature. Lattice parameters were calculated for both materials.

Original languageEnglish
Title of host publicationMaterials Science and Technology Conference and Exhibition 2010, MS and T'10
Pages206-213
Number of pages8
Publication statusPublished - 2010 Dec 1
EventMaterials Science and Technology Conference and Exhibition 2010, MS and T'10 - Houston, TX, United States
Duration: 2010 Oct 172010 Oct 21

Publication series

NameMaterials Science and Technology Conference and Exhibition 2010, MS and T'10
Volume1

Other

OtherMaterials Science and Technology Conference and Exhibition 2010, MS and T'10
CountryUnited States
CityHouston, TX
Period10/10/1710/10/21

Keywords

  • High-temperature x-ray diffractometry
  • Oxygen nonstoichiometry
  • Strontium doped lanthanum cobaltite
  • Strontium doped lanthanum ferrite

ASJC Scopus subject areas

  • Materials Science (miscellaneous)

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