Abstract
Polycrystalline manganites of composition La2/3Sr1/3Mn1 − x T x O3 (T = Cr3 + or Fe3 + , x = 0.0–0.10) were obtained by the Pechini method. Their magnetic properties exhibited a marked dependence on Fe/Cr content, with significant reduction of the magnetic moment per formula unit and their Curie temperatures. In addition, the magnetocaloric effect, determined by isothermal magnetization measurements, displayed a decreasing tendency with increasing Fe/Cr concentration. Results were interpreted on the basis of a deleterious effect on the double exchange interaction provoked by the presence of Fe3 + and Cr3 + ions within the crystal structure. Polycrystalline mixed valence manganites of composition La2/3Sr1/3Mn1 − x T x O3 (T= Cr3 + or Fe3 + , x = 0.0–0.10) were obtained by the amorphous citrate process known as Pechini method. Their magnetic properties (Curie temperature and spontaneous magnetization) exhibited a marked dependence with Fe or Cr content, together with magnetic entropy variations of up to 2.0 J/kgK.
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