Abstract
We report the crystallographic and magnetic effects on inverse spinel Fe1−x Ni x Ga2O4 (0.0 ≤ x ≤ 0.9) due to doped Ni cations. The crystalline structures of Fe1−x Ni x Ga2O4 (0.0 ≤ x ≤ 0.9) were examined by using a Philips X’Pert diffractometer with a Cu Kα radiation (λ = 1.5406 Å) source and analyzed with the Rietveld refinement method. The crystal structures were found to be inverse spinel with space group Fd-3m. From the Rietveld analysis, with increasing Ni concentration, the ratio of magnetic Fe2+ cations, compared to the total number of Fe2+ cations on A-site (tetrahedron) decreased from 43 to 7%, and that on B-site (octahedron) increased from 57 to 93%. The lattice constants a 0, and bond length \(d_{Ga^{3+}-Fe^{2+}[Ni^{2+}]}\) on A-site and B-site decreased linearly with increasing Ni concentration. From the temperature dependence of susceptibility χ in zero-field-cooled and field-cooled magnetization under 400 Oe, with increasing Ni concentration, the sample showed a decrease in the freezing temperature T f . Mössbauer spectra of all samples at room temperature showed 2-sets (A-site, and B-site) with large electric quadrupole splitting. The Mössbauer absorption area ratio of A-site decreased, while that of B-site increased with increasing Ni concentration, which is accord with the Rietveld refinement analysis of the XRD results.
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Myoung, B.R., Lim, J.T. & Kim, C.S. Crystallograhic and magnetic properties of Fe1−x Ni x Ga2O4 . Journal of the Korean Physical Society 70, 85–88 (2017). https://doi.org/10.3938/jkps.70.85
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DOI: https://doi.org/10.3938/jkps.70.85