Structural, optical, dielectric, and magnetic properties of iron-sillenite Bi 25 FeO 40

The iron-sillenite Bi 25 FeO 40 has been synthesized using the solid-state reaction route. The elaborated material crystallizes in a cubic structure. The studied material exhibits an anomaly, noticed via the DSC analysis and dielectric measurements at 671 K. This anomaly can be attributed to the occurrence of a thermally activated relaxation in the Bi 25 FeO 40 sample. Besides, the magnetic study revealed the antiferromagnetic behaviour of γ-Bi 25 FeO 40 sillenite, with a 240 K of Neel temperature T N , Curie constant of 9.18 10 –8 m 3 .K/mol, resulting in a magnetic moment of 6.37 μ B . Furthermore, the band gap of Bi 25 FeO 40 is about 2.02 eV and the magnetic behavior makes it an appropriate candidate as a photocatalyst for water and/or wastewater treatment, and degradation of pollutants, that can be simply recycled by magnetic separation.