Co-Doped Rare-Earth (La, Pr) and Co-Al Substituted M-Type Strontium Hexaferrite: Structural, Magnetic, and Mossbauer Spectroscopy Study — Oak Academic Publishing
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Co-Doped Rare-Earth (La, Pr) and Co-Al Substituted M-Type Strontium Hexaferrite: Structural, Magnetic, and Mossbauer Spectroscopy Study
Department of Physics, Virginia Commonwealth University, Richmond, VA, USA
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Department of Physics, Kent State University, Kent, OH, USA
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Department of Physics and Astronomy, Truman State University, Kirksville, MO, USA
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Department of Physics and Materials Science, The University of Memphis, Memphis, TN, USA
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Department of Physics, Gunsan National University, Gunsan, South Korea
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Department of Physics and Materials Science, The University of Memphis, Memphis, TN, USA
1 Department of Physics, Virginia Commonwealth University, Richmond, VA, USA
2 Department of Physics, Kent State University, Kent, OH, USA
3 Department of Physics and Astronomy, Truman State University, Kirksville, MO, USA
4 Department of Physics and Materials Science, The University of Memphis, Memphis, TN, USA
5 Department of Physics, Gunsan National University, Gunsan, South Korea
6 Department of Physics and Materials Science, The University of Memphis, Memphis, TN, USA
The present study investigates the influence of La 3+ and Pr 3+ doping on the structural, magnetic properties, and hyperfine fields of Sr 0.7 RE 0.3 Fe 12-2x Co x Al x O 19 , (RE: La 3+ and Pr 3+ , 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 Pr 3+ doped Sr 0.7 Pr 0.3 Fe 12-2x Co x Al x O 19 (Pr 3+ -SrM), the magnetization value monotonically decreases while for La 3+ doped Sr 0.7 La 0.3 Fe 12-2x Co x Al x O 19 (La 3+ -SrM) magnetization value shows a noticeable increase in magnetization value with x . The coercivity of the Pr 3+ -SrM compound was observed to decrease while that of the La 3+ -SrM compound showed a marked 40% increase at x = 0.2 (~5829 Oe) in comparison to undoped SrFe 12 O 19 (~3918 Oe). A difference in Curie temperature was also observed, with Tc ~ 525 ° C at x = 0.4 for Pr 3+ -SrM and Tc = 505 ° C for x = 0.4 for La 3+ -SrM compound. The observed differences in magnetic properties have been explained on the basis of the site occupancy of Co 2+ and Al 3+ in the presence of rare-earth ions. The presence of non-magnetic rare-earth ion, La 3+ , improved saturation magnetization, and coercivity and deemed suitable replacement for Sr 2+ . The hyperfine parameters namely quadrupole shift showed a decrease with the La3 + or Pr 3+ doping independent of (Co 2+ -Al 3+ ) ions doping. Overall, the Mossbauer analysis suggests that the (Co 2+ -Al 3+ ) impurities prefer occupancy at 2 a site.
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