Journal of Materials Science

, Volume 30, Issue 5, pp 1245–1250 | Cite as

Nonstoichiometry and physical properties of the perovskite BaxLa1−xFeO3−y system

  • K. S. Roh
  • K. H. Ryu
  • C. H. Yo


A series of samples in the BaxLa1−xFeO3−ysystem (x=0.00, 0.25, 0.50, 0.75, and 1.00) have been prepared at 1200°C under an atmospheric air pressure. The solid solutions of the system were analysed from the X-ray diffraction spectra and thermal analyses. X-ray diffraction studies assigned the compositions of the x=0.00 and 1.00 to the orthorhombic system and the compositions of the x=0.25, 0.50, and 0.75 to the cubic system. The reduced lattice volume increased with the x value in the system. The mole ratios of the Fe4+ ion in the solid solutions, or τ values, were determined by Mohr salt analyses and the non-stoichiometric chemical formulae of the system were formulated from the x, τ, and y values. From the results of the Mössbauer spectroscopy, the coordination and the magnetic property of the iron ion have been discussed. The electrical conductivities were measured as a function of temperature under atmospheric air pressure. The activation energy was minimum at the composition of x=0.50. The conduction mechanism can be explained by the hopping model between the mixed valences of the Fe3+ and Fe4+ ions.


Activation Energy Electrical Conductivity Solid Solution Thermal Analysis Perovskite 
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Copyright information

© Chapman & Hall 1995

Authors and Affiliations

  • K. S. Roh
    • 1
  • K. H. Ryu
    • 1
  • C. H. Yo
    • 1
  1. 1.Department of ChemistryYonsei UniversitySeoulKorea

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