Modification of Bismuth Ferrite BiFeO3 Nanopowder under the Action of High-Power Pulsed Microwave Radiation of a Gyrotron

Microwave radiation of a gyrotron, during its interaction with powder mixtures, initiates plasma-chemical exothermic processes in air in which components of the initial powder mixture participate. In the experiments performed, use is made of bismuth ferrite (\({\text{BiFe}}{{{\text{O}}}_{3}}\)) nanopowders with a particle size of 40–50 nm, which are transformed into spheroid microparticles with a size up to 100 μm and a complicated structure and surface morphology. The surface of the synthesized particles has nanoinclusions and dips, due to which the surface area increases (by ~1.5 times). On the surface of the produced particles, two types of inclusions (grains) with an increased iron content and a size up to 3 μm are found against the background of bismuth ferrite, with their shape having the form of quadrangles and hexagons.