Oxide Phases in Bismuth Ferrite (BFO)—Key for Photovoltaic Application

Iron oxides have gained recognition in the twenty-first century for their innumerable applications in a variety of sectors, including nano-biotechnology, biomedical engineering, and many more. Iron oxides’ super-paramagnetic characteristic and smaller size are the main factors in their widespread application. There are numerous polymorphic forms of iron oxide that display various magnetic properties, catalytic activity, biocompatibilities, and other multifunctional qualities. Iron oxide possesses five unpaired electrons and is ferromagnetic by nature, with Ms value 1.7 emu/g, according to magnetic experiments. Five are arranged in a 3D shell that is half filled in Fe3+. The Fe3+ magnetic moments are connected anti-ferromagnetically between adjacent planes and ferromagnetically inside the pseudo cubic (111) planes. A shifting magnetic field in the iron oxide-based materials allows an electric current to flow through conductive material. This induced electrical current can be measured with a magnetoelectric sensor. In ferromagnetic materials like Fe2O3, spin creation is introduced, which created the device application known as spintronics.