Structural and Static Magnetic Behavior of Antiferromagnetic Compounds La0.67Sr0.33−xCaxMn0.75Fe0.25O3 (x = 0.00 and 0.17) View Full Text


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Article Info

DATE

2016-08

AUTHORS

Za. Mohamed, Mounira Abassi, E. Tka, J. Dhahri, E. K. Hlil

ABSTRACT

We investigated the structural and magnetic properties of polycrystalline La0.67Sr0.33−xCaxMn0.75Fe0.25O3 (x = 0.00 and 0.17) samples. Rietveld refinement of X-ray powder diffraction (XRD) patterns shows that the samples adopt a rhombohedral structure with the R3¯c space group. The average particle size of each sample was estimated from the most intense peak (104) of XRD pattern using Debye–Scherrer’s formula. The average sizes are 73 and 82 nm. Static magnetic measurements, viz., hysteresis loops, field-cooled and zero field-cooled magnetization versus temperature curves of some samples carried out by BS1 and BS2 magnetometers in the temperature range of 400 to 5 K, clearly indicate the presence of a superparamagnetic (SPM) relaxation in the samples. Samples with x = 0.00 and x = 0.17 show an antiferromagnetic–paramagnetic (AFM–PM) transition at Neel temperature (TN) and a charge ordering transition, characterized by an extra peak (or shoulder) at TCO. The magnetocrystalline anisotropy, average particle size, and its distribution were calculated from the analysis of the static magnetic data. The results are in good agreement with those obtained from XRD observations. More... »

PAGES

2109-2117

References to SciGraph publications

  • 2012-05. Structural and Magnetic Studies of Ca2−xSmxMnO Compounds (x=0–0.4) in JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
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