Oxygen non-stoichiometry, redox thermodynamics, and structure of LaFe1 - xCoxO3 - δ

Mehdi Pishahang*, Egil Bakken, Svein Stølen, Christopher Ian Thomas, Paul Inge Dahl

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

11 Sitaatiot (Scopus)

Abstrakti

The oxygen non-stoichiometry and redox thermodynamic properties of the LaFe1 - xCoxO3 - δ system (x = 0.25 and 0.75) are studied. At low temperatures, the LaCoO3 and LaFeO3 systems show partial solid solubility. At 1,273 K (in air), both compounds are single phases and are orthorhombic and rhombohedral for x = 0.25 and 0.75, respectively. Thermogravimetry has been used to measure the oxygen non-stoichiometry versus oxygen partial pressure at three temperatures, 1,223, 1,273, and 1,323 K. Redox thermodynamic quantities are extracted directly from the oxygen non-stoichiometry curves. The extracted enthalpies of oxidation do not vary significantly with stoichiometry, and for x = 0.25 and 0.75, they are -640 ± 60 and -440 ± 60 kJ (mol O2)-1, respectively. Ideal solid solution thermodynamic models are used to analyze the redox mechanisms.

AlkuperäiskieliEnglanti
Sivut869-878
Sivumäärä10
JulkaisuIONICS
Vuosikerta19
Numero6
DOI - pysyväislinkit
TilaJulkaistu - kesäk. 2013
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

Sormenjälki

Sukella tutkimusaiheisiin 'Oxygen non-stoichiometry, redox thermodynamics, and structure of LaFe1 - xCoxO3 - δ'. Ne muodostavat yhdessä ainutlaatuisen sormenjäljen.

Siteeraa tätä