Magnetic Properties and Magnetic Structure of Amorphous Oxides in the Fe3O4-CaO-SiO2 System

Magnetic properties of amorphous Fe
3
O
4
-CaO-SiO
2
are described in terms of the microscopic structure. The amorphous region and magnetization strengths for the system were determined, while measurements of the temperature dependence of magnetization revealed no clear Curie temperature; this was attributed to thermal decomposition of the ferrimagnetic crystalline phase. Mossbauer spectra indicated that the material was paramagnetic at room temperature and ferrimagnetic at 4.2 K. It was concluded that Fe
³⁺
in octahedral sites, Fe
³⁺
in tetrahedral sites and Fe
²⁺
interact paramagnetically.