Thermodynamic representation of nonstoichiometric lanthanum manganite

Harumi Yokokawa, Teruhisa Horita, Natsuko Sakai, Masayuki Dokiya, Tatsuya Kawada

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

The thermodynamic properties of the lanthanum manganites, La1-xMn1-yO3-z, have been reevaluated within the ideal association model to simultaneously account for excess oxygen and lanthanum nonstoichiometry of LaMnO3+δ, La0.95MnO3+δ and La0.9MnO3+δ. It has been found that a new set of parameters can reproduce the essential features of the thermogravimetric results reported in literature; that is, the averaged manganese valence at P(O2) = 1 atm does not depend largely on the lanthanum nonstoichiometry between LaMnO3+δ and La0.9MnO3+δ. Beyond this composition, however, the thermodynamic model has predicted that the averaged manganese valence increases with decreasing lanthanum stoichiometry and has confirmed the key idea for explaining the chemical reactivity of the lanthanum manganite such as the La2Zr2O7 formation and the Mn3O4 precipitation.

Original languageEnglish
Pages (from-to)1161-1165
Number of pages5
JournalSolid State Ionics
Volume86-88
Issue numberPART 2
DOIs
Publication statusPublished - 1996 Jul

Keywords

  • Defects
  • Lanthanum manganite
  • Perovskite
  • SOFC
  • Thermodynamic properties

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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