Indexed on: 19 Jun '13Published on: 19 Jun '13Published in: Journal of Chemical Sciences
Polycrystalline manganites of composition La2/3Sr1/3Mn1 − xTxO3 (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 − xTxO3 (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.