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Structural, magnetic and electrochemical characterization of La0.83A0.17Fe0.5Cr0.5O3_δ (A = Ba, Ca) perovskites

Research output: Contribution to journalArticle

Author(s)

AK Azad, CG Eriksson, John Thomas Sirr Irvine

School/Research organisations

Abstract

The structural, magnetic and electrical properties of the perovskite-type compound La(0.83)A(0.17)Fe(0.5)Cr(0.5)O(3-delta) (A = Ba, Ca) have been investigated by neutron diffraction, magnetization measurements and conductivity measurements. Rietveld refinement of X-ray and neutron diffraction data shows that the compound adopts an orthorhombic crystal structure with Pbnm symmetry with a random positioning of the iron and chromium cations on the B sublattice. The magnetic structures at 10 K are collinear antiferromagnetic with the magnetic moment per site being equal to 2.91(2)mu(B) (for Ba) and 3.05(2)mu(B) (for Ca). Magnetization measurements confirm the overall antiferromagnetic behavior. The magnetic structure is based Oil a unit cell related to that of the nuclear structure and the magnetic cell can be considered the same as nuclear cell. Barium doped samples show lower oxygen deficiency and higher conductivity than calcium doped samples. At low oxygen pressure, both compounds show p-type electronic conduction. (c) 2009 Elsevier Ltd. All rights reserved.

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Details

Original languageEnglish
Pages (from-to)1451–1457
Number of pages7
JournalMaterials Research Bulletin
Volume44
Issue number7
Early online date26 Mar 2009
DOIs
Publication statusPublished - 1 Jul 2009

    Research areas

  • Oxides, Chemical synthesis, Impedance spectroscopy, Crystal structure, Electrochemical properties, Magnetic properties, TEMPERATURE ELECTRICAL-CONDUCTIVITY, TRANSPORT-PROPERTIES, IONIC TRANSPORT, LA1-XSRXFEO3-DELTA, OXYGEN, NONSTOICHIOMETRY, DIFFRACTION, OXIDES, FILMS

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