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Electronic Conductivity, Seebeck Coefficient, and Defect Structure of La 1‐x Sr x FeO 3 ( x =0.l, 0.25)
Author(s) -
MIZUSAKI JUNICHIRO,
SASAMOTO TADASHI,
CAN W. ROGER,
BOWEN H. KENT
Publication year - 1983
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1983.tb15707.x
Subject(s) - seebeck coefficient , electrical resistivity and conductivity , thermoelectric effect , materials science , analytical chemistry (journal) , partial pressure , thermal conduction , conductivity , atmospheric temperature range , thermoelectric materials , oxygen , condensed matter physics , chemistry , thermodynamics , electrical engineering , composite material , physics , organic chemistry , engineering , chromatography
The electrical conductivity and Seebeck coefficients of La 1‐x Sr x FeO 3 ( x =0.1, 0.25) were measured as a function of oxygen partial pressure, P O2 , at T =900° to 1300°C. The electrical conduction was p type in the higher P O2 range, and n type in the lower P O2 range. The Seebeck coefficient indicated that the conduction was due to electron hopping between Fe × Fe and Fe Fe , in the higher P O2 range and electron hopping between Fe′ Fe and Fe × Fe in the lower range. The carrier concentrations were calculated from the values of electrical conductivity and Seebeck coefficient. From the P O2 dependences of the carrier concentrations, the defect structure of La 1‐x Sr x FeO 3 was determined. It was found that the electrical properties can be described by considering the imperfections Sr La , Vo , Fe Fe , and Fe′ Fe .