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Effect of Terbium Ion Substitution in Inverse Spinel Nickel Ferrite: Structural and Magnetic Study

1
Department of Physics, The University of Memphis, Memphis, TN 38152, USA
2
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37381, USA
3
Department of Physics, Kunsan National University, Gunsan 573-701, Korea
*
Author to whom correspondence should be addressed.
Magnetochemistry 2020, 6(1), 14; https://doi.org/10.3390/magnetochemistry6010014
Received: 30 January 2020 / Revised: 28 February 2020 / Accepted: 2 March 2020 / Published: 10 March 2020
Doping rare-earth ions into spinel ferrites can alter their electrical and magnetic properties. The present study delineates the structure–property relationship of the effect of rare-earth terbium doping in NiFe2O4 ferrite. X-ray diffraction analysis (XRD) showed unit cell lattice expansion with increased Tb3+ content. The Fourier transform infrared spectroscopy (FTIR) results indicate preferential occupancy of Tb3+ at the octahedral B site. The magnetic parameters derived from room temperature hysteresis loops where both the saturation magnetization, Ms, and coercivity, Hc, value decreased with the Tb3+ substitution and reached a minimum value of Ms ~30.6 emu/g at x = 0.1 and Hc ~102 Oe at x = 0.075. The temperature-dependent magnetocrystalline anisotropy derived from the magnetic isotherm was observed to be the highest for x = 0.1 at 5 K with the value K1 ~1.09 × 106 J/m3. The Tb3+ doping also resulted in the Curie temperature reduction from 938 K at x = 0.0 to 899 K at x = 0.1. View Full-Text
Keywords: nickel ferrite; spinel; coercivity; isotherm; rare-earth ion nickel ferrite; spinel; coercivity; isotherm; rare-earth ion
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Guragain, D.; Rai, B.K.; Yoon, S.; Poudel, T.P.; Bhandari, S.C.; Mishra, S.R. Effect of Terbium Ion Substitution in Inverse Spinel Nickel Ferrite: Structural and Magnetic Study. Magnetochemistry 2020, 6, 14.

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