<p>Structural, electrical, magnetic, and <sup>57</sup>Fe Mössbauer studies on lanthanum (La)-doped DyFeO<sub>3</sub> (Dy<sub>1-x</sub>La<sub>x</sub>FeO<sub>3</sub>) are reported in this paper. X-ray diffraction measurements confirm the lattice expansion with La doping. Raman spectroscopic studies give insights into the doping of La into Dy in DyFeO<sub>3</sub>. The temperature-dependent magnetization studies of samples show that there is a shift in the spin-reorientation transition temperature (<i>T</i><sub>SR</sub>) towards the lower temperatures with the increase of La-doping concentration for pure DyFeO<sub>3</sub> (DFO), Dy<sub>0.8</sub>La<sub>0.2</sub>FeO<sub>3</sub> (La2), and Dy<sub>0.6</sub>La<sub>0.4</sub>FeO<sub>3</sub> (La4) samples which could be due to the weakening of Fe<sup>3+</sup>-Dy<sup>3+</sup> exchange interaction. Isothermal magnetization data and magnetically split sextet <sup>57</sup>Fe Mossbauer spectra of all the samples confirm the presence of antiferromagnetic ordering at room temperature. In addition, the observed magnetization data of LaFeO<sub>3</sub> (<i>x</i> = 1.0) sample indicates the presence of spin-glasslike behavior. It is also observed that with the increase of La doping, porosity increases resulting in the enhancement of leakage current density. Ohmic and space charge limited conduction (SCLC) mechanisms explain the conduction mechanism present in the samples.</p>

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Exploring the Effect of La Substitution on Magnetic and Electrical Behavior of DyFeO3

  • S. Shravan Kumar Reddy,
  • S. Shanmukharao Samatham,
  • T. Sowmyya,
  • M. Sreenath Reddy,
  • G. R. Turpu,
  • Ch. Gopal Reddy,
  • P. Yadagiri Reddy,
  • V. Raghavendra Reddy

摘要

Structural, electrical, magnetic, and 57Fe Mössbauer studies on lanthanum (La)-doped DyFeO3 (Dy1-xLaxFeO3) are reported in this paper. X-ray diffraction measurements confirm the lattice expansion with La doping. Raman spectroscopic studies give insights into the doping of La into Dy in DyFeO3. The temperature-dependent magnetization studies of samples show that there is a shift in the spin-reorientation transition temperature (TSR) towards the lower temperatures with the increase of La-doping concentration for pure DyFeO3 (DFO), Dy0.8La0.2FeO3 (La2), and Dy0.6La0.4FeO3 (La4) samples which could be due to the weakening of Fe3+-Dy3+ exchange interaction. Isothermal magnetization data and magnetically split sextet 57Fe Mossbauer spectra of all the samples confirm the presence of antiferromagnetic ordering at room temperature. In addition, the observed magnetization data of LaFeO3 (x = 1.0) sample indicates the presence of spin-glasslike behavior. It is also observed that with the increase of La doping, porosity increases resulting in the enhancement of leakage current density. Ohmic and space charge limited conduction (SCLC) mechanisms explain the conduction mechanism present in the samples.