Influence of Zinc Doping on the Structural and Magnetic Properties of α-Fe2O3

Magnetic and structural properties of pure and Cr-doped haematite: α-Fe2−xCr x O3 (0 ≤ x ≤ 1)

“…Due to its high Neel temperature (T N = 965 K) and possibly a high effective anisotropy constant, the Mössbauer spectrum at room temperature appears as a sextet with a hyperfine field of about 51 T and a quadruple shift of about 0.2 mm/s. We have calculated these parameters using NORMOS-SITE program for all prepared samples, which are in good agreement with reported results [22,24]. From these two results of -Fe 2 O 3…”

“…The Mössbauer parameters are derived from the spectra using the single symmetric Lorentzianshaped sextet model, and an additional quadruple model is required for Cr doping (x  0.50). The obtained hyperfine parameters are with respect to natural iron consistent with the earlier experimental data [22,[26][27][28]. Though -Fe 2 O 3 is a very common iron oxide in solids, it is particularly interesting due to its two magnetic phases namely week ferromagnetism (WF, at ambient condition, ~300 K) and antiferromagnetic (AF, at non-ambient condition, ~265 K).…”

“…The magnetic properties of doped haematite are completely altered as compared to that of bulk haematite. However, few investigations of the magnetic properties of doped haematite have been reported [22,23].…”

“…On the other hand, non-magnetic cation as Zn-substituted haematites prepared by coprecipitation method is less studied and Zn 2+ -doped haematites document an additional doublet pattern apart from single sextet and doublet. The hyperfine parameters are affected for Zn 2+ substitution in haematites, and the decreasing magnetic ordering results in weak ferromagnetic nature [22].…”

Prospects for the incorporation of cobalt into α-Fe2O3 nanorods during hydrothermal synthesis

“…manganese, nickel or zinc, have been investigated, by means of thermal treatment [26,27], HS [28] or sol-gel processing [29,30], with the aim of enhancing further the magnetic performance of a-Fe 2 O 3. In particular, it is suggested that the doping of iron oxide thin films with ferromagnetic cobalt can improve the magnetic coercivity [31], although definitive evidence for the incorporation of cobalt into a-Fe 2 O 3 NRs is still required.…”