Fe3O4 crystallizes in the orthorhombic Cmcm space group. Firstly, Fe3O4 gave strong magnetic properties to nanocomposites, which made them easy to manipulate and to observe by using various techniques, such as magnetic-resonance imaging. We have investigated the structure of an ultrathin iron oxide phase grown on Ag(100) using surface x-ray diffraction in combination with Hubbard-corrected density … The Fe3O4 hollow nanospheres showed single-c … Figure 2 reveals that the absorption peaks of the prepared Fe 3 O 4 nanoparticles was found within the average UV-vis absorption region [5, 17], the average lower absorption wavelength of 262.13nm and 230 nm is observed in all the samples. A pristine magnetite (Fe3O4) specimen was studied by means of Neutron Powder Diffraction in the 273–1,073 K temperature range, in order to characterize its structural and magnetic behavior at high temperatures. Magnetite crystallizes in the inverse cubic spinel structure (Fd-3m [Fe 3 +] A [Fe 2 + Fe 3 +] B O 4), where A is the tetrahedral and B the octahedral side ().The energy bands of the Fe 3 O 4 nanoparticles were described by Sadat et al. The optical properties of Fe 3 O 4 nanoparticles are associated with their crystal structure. Therefore, the magnetic Fe3O4@graphene nanocomposites have great potential Secondly, graphene has a large specific surface area for carrying drugs [ 29 ]. The structure is three-dimensional. An accurate analysis of the collected data allowed the understanding of the behavior of the main structural and magnetic features of magnetite as a function of temperature. there are two inequivalent Fe+2.67+ sites. Magnetite (Fe3O4) hollow nanospheres with an average diameter of 300 nm and an average shell thickness of 40 nm were synthesized by a surfactant-free solvothermal reduction method, and their structure and electromagnetic (EM) properties were investigated. Secondly, graphene has a large specific surface area for carrying drugs [29]. The structure of the Fe3O4(110)-(1 × 3) surface was studied with scanning tunneling microscopy (STM), low-energy electron diffraction (LEED), and reflection high energy electron diffraction (RHEED). In the first Fe+2.67+ site, Fe+2.67+ is bonded in a 6-coordinate geometry to six O2- atoms. Fe3O4 gave strong magnetic properties to nanocompos-ites, which made them easy to manipulate and to observe by using various techniques, such as magnetic-resonance imaging. The UV-visible spectroscopy was used to characterize the structure of Fe 3 O 4 nanoparticles. There are two shorter (2.13 Å) and four longer (2.29 Å) Fe–O bond lengths.