ε-Phase of iron oxide out of thermally treated magnetite nanoparticles

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:497

Article

Klekotka, Urszula¹  Satula, Dariusz²  Kalska-Szostko, Beata¹ 

[1] Univ Bialystok, Inst Chem, Ciolkowskiego 1K, PL-15245 Bialystok, Poland

[2] Univ Bialystok, Fac Phys, Ciolkowskiego 1L, PL-15245 Bialystok, Poland

关键词: epsilon-Fe2O3;    Magnetic nanoparticles;    Mossbauer spectroscopy;    Phase transformation;   

DOI  :  10.1016/j.jmmm.2019.165999

来源: Elsevier

【 摘 要 】

In this paper, epsilon-Fe2O3 phase was achieved by the thermal treatment of magnetite nanoparticles. Magnetite was synthesized, with or without silica shell, and treated with different annealing procedures in oxygen or argon atmospheres. Therefore, the necessary conditions for Fe3O4 transformation to epsilon-Fe2O3 were studied. Before and after thermal treatment, the physicochemical and magnetic properties of starting materials were investigated. The size and morphology of obtained nanostructures were characterized using Transmission Electron Microscopy. Crystalline structure and presence of gamma-, alpha-, epsilon-Fe2O3 phases were examined by X-ray diffraction. Magnetic properties were studied by the Mossbauer effect with and without the presence of an external magnetic field. Obtained results show that epsilon-Fe2O3 phase can be achieved from magnetite nanoparticles coated with silica shell in oxygen rich environment only.

【 授权许可】

Free