Structural, magnetic and electrochemical characterization of La(0.83)A(0.17)Fe(0.5)Cr(0.5)O(3-delta) (A = Ba, Ca) perovskites
Journal article, 2009
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.
temperature electrical-conductivity
la1-xsrxfeo3-delta
Crystal structure
Electrochemical properties
Magnetic properties
Chemical synthesis
Impedance spectroscopy
transport-properties
transport
nonstoichiometry
oxides
diffraction
oxygen
Oxides
ionic
films
Author
A. K. Azad
University of St Andrews
Sten Eriksson
Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry
J. T. S. Irvine
University of St Andrews
Materials Research Bulletin
0025-5408 (ISSN)
Vol. 44 7 1451-1457Subject Categories (SSIF 2011)
Other Materials Engineering
DOI
10.1016/j.materresbull.2009.03.008