Abstract
Hematite has been applied for many fields because of its excellent characteristics. It shows various magnetic characteristics such as weak-ferromagnetic, anti-ferromagnetic and superparamagnetic characters. Doping to hematite with other transition metal is one method to maintain one of magnetic properties. Nb5+ was used as a dopant for hematite to know the influence of pentavalent dopant toward the structure and characteristics of hematite. PXRD showed that Nb was incorporated to hematite lattice, while at higher calcination temperature Nb was excluded to the surface forming FeNbO4. The sample calcined at 600 °C mainly showed a hematite structure, but it was attracted to magnet. This is maybe because of ferrimagnetic interaction due to the introduction of Nb. The attraction to magnet became weak for the sample calcined at 700 °C, maybe due to the exclusion of Nb as FeNbO4. By exclusion of Nb, ferrimagnetic character changed to pure weak-ferromagnetism. Mӧssbauer spectrum measurement at 78 K (− 195 °C) showed that two sites in hematite crystal structure for sample calcined at 700 °C. The Mӧssbauer parameters showed that the weak-ferromagnetism partially exists even at lower temperature. Nb-doped (≥ 3.8 at. %) hematite calcined at 600 °C showed weak-ferromagnetism both at 78 and 298 K.
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Rahman, H., Nakashima, S. 57Fe Mössbauer spectroscopic study on the magnetic structure of niobium-doped hematite. Appl. Phys. A 128, 564 (2022). https://doi.org/10.1007/s00339-022-05691-x
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DOI: https://doi.org/10.1007/s00339-022-05691-x