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Co-doped Rare-Earth (La, Pr) and Co-Al Substituted M-Type Strontium hexaferrite: Structural, Magnetic, and Mossbauer Spectroscopy Study

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Materials Sciences and Applications 2020年第7期11卷 474-493页

作者： Madhav L. Ghimire Dom L. Kunwar Jiba N. Dahal Dipesh Neupane Sunghyun Yoon Sanjay R. Mishra Department of Physics and Materials Science The University of Memphis Memphis TN USA Department of Physics Virginia Commonwealth University Richmond VA USA Department of Physics Kent State University Kent OH USA Department of Physics and Astronomy Truman State University Kirksville MO USA Department of Physics Gunsan National University Gunsan South Korea

The present study investigates the influence of La3+ and Pr3+ doping on the structural, magnetic properties, and hyperfine fields of Sr0.7RE0.3Fe12-2x CoxAlxO19, (RE: La3+ and Pr3+, x = 0.0 - 0.8) hexaferrite compounds prepared via auto-combustion technique. The XRD analysis shows a linear decrease in a and c lattice and unit cell volume contraction with the content x. The room temperature magnetic study shows that for the Pr3+ doped Sr0.7Pr0.3Fe12-2x CoxAlxO19 (Pr3+-SrM), the magnetization value monotonically decreases while for La3+ doped Sr0.7La0.3Fe12-2xCoxAlxO19 (La3+-SrM) magnetization value shows a noticeable increase in magnetization value with x. The coercivity of the Pr3+-SrM compound was observed to decrease while that of the La3+-SrM compound showed a marked 40% increase at x = 0.2 (~5829 Oe) in comparison to undoped SrFe12O19 (~3918 Oe). A difference in Curie temperature was also observed, with Tc ~ 525°C at x = 0.4 for Pr3+-SrM and Tc = 505°C for x = 0.4 for La3+-SrM compound. The observed differences in magnetic properties have been explained on the basis of the site occupancy of Co2+ and Al3+ in the presence of rare-earth ions. The presence of non-magnetic rare-earth ion, La3+, improved saturation magnetization, and coercivity and deemed suitable replacement for Sr2+. The hyperfine parameters namely quadrupole shift showed a decrease with the La3+ or Pr3+ doping independent of (Co2+-Al

关键词： doped hexaferrite M-Type hexaferrite X-Ray Diffraction Mossbauer

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