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No.1(pp.1-25)

Home > Issues > Volume 5 (2000) > No.1(pp.1-25)

Synthesis and Mössabuer Spectroscopy Studies of Nd_1-xBi_xY₂Fe₅O₁₂Nano-Particles

Journal of Magnetics, Volume 5, Number 1, 31 Mar 2000, Pages 16-18

Young Rang Uhm(Department of Physics Kookmin University), Jae-Gwang Lee(Department of Applied Physics, Konkuk University), Chul Sung Kim(Department of Physics Kookmin University)

Abstract

The garnets Nd_1-xBi_xY₂Fe₅O₁₂ (x=0.0, 0.25, 0.5, 0.75 and 1.0) have been studied by x-rays, electron microscopy, ferromagnetic resonance, vibrating sample magnetometer and Mössbauer spectroscopy, Ultra-fine polycrystalline cubic samples have been prepared by a melt-salt routed sol-gel method. The Mössbauer spectra consist of two sets of six-line patterns corresponding Fe³⁺ to at the tetrahedral 24(d) and octahedral 16(a) sites. Magnetic hyperfine fields of Nd_0.5Bi_0.5Y₂O₁₂ at 12 K are found to be 548 kOe (octahedral site) and 475 kOe (tetrahedral site), respectively, It is found that Debye temperatures for the tetrahedral and octahedral sites of Nd_0.75Bi_0.25Y₂Fe₅O₁₂ are θ_oct=285 K, respectively, The iron ions at both sites are highly covalent ferric. The Nel temperature decreases linearly with Bi concentration, from 630 K for =0.0 to 600 K for =1.0, suggesting that the superexchange interaction for the Nd-O-Fe link is stronger than that for the Bi-O-Fe link. As a consequence, the coercivity of Nd_1-xBi_xY₂Fe₅O₁₂ drastically decreases and the magnetization remains almost constant as x increases.

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