Synthesis of BiFeO3-Powders by Sol-Gel Process S.A. Khakhomov 1 , V.E. Gaishun 1 , D.L. Kovalenko 1 , A.V. Semchenko 1 , V.V. Sidsky 1 , W. Strek 2 , D. Hreniak 2 , A. Lukowiak 2 , N.S. Kovalchuk 3 , A.N. Pyatlitski 3 , V.A. Solodukha 3 , D. V. Karpinsky 4 1 F. Skorina Gomel State University, Sovetskaya 104, Gomel, 246019, Belarus 2 Institute of Low Temperature and Structures Research PAS, 2 Okolna St., Wroclaw, Poland 3 JSC “INTEGRAL”, Korjenevsky str., 12, Minsk, 220108, Belarus 4 Scientific-Practical Materials Research Centre of National Academy of Sciences of Belarus semchenko@gsu.by Abstract. The present work aims to design and study novel functional materials with multiferroic properties required in electric applications, such as magnetic and magnetoresistive sensors, actuators, microwave electronic devices, phase shifters, mechanical actuators etc. Complex oxides BiFeO3 for analysis of its magnetic properties were synthesized by sol-gel method as powders. The size, shape and degree of crystallinity of the nanoparticles formed by sol-gel method can be controlled by varying the temperature and the ratio of the concentrations of the initial reactants and the stabilizer. To stop the growth of particles in all cases, it is usually enough to cool quickly the reaction mixture. To isolate the nanoparticles, the precipitating solvent is added, which mixes with the reaction system, but poorly dissolves the "protective shells" of the nanoparticles and, therefore, destabilizes the suspension. As a result, the nanoparticles precipitate as powder, which can be separated by centrifugation. The sol-gel method makes it possible to obtain practically monodisperse nanoparticles of various metals oxides. Keywords: sol-gel, film, powder, ferromagnets Introduction Multiferroics have been known as materials exhibiting ferromagnetic and ferroe- lectric properties at the same time, which have exhibited interesting physical proper- ties as well as a possibility of practical applications. The rhombohedrally distorted simple perovskite structure of BiFeO3 is one of the representative multiferroic materi- als and has been much interested due to the antiferromagnetic behavior with a rela- tively high Neel temperature and the ferroelectric behavior with a high Curie tempera- ture. Multiferroic materials, owing to the coexistence of ferroelectricity, ferromag- netism and even ferroelasticity in the same phase, have shown promising applications in nonvolatile information storages, spintronic devices and magnetoelectric sensors. Among the multiferroic materials studied so far, BiFeO3 (BFO) is known to have a rhombohedrally distorted perovskite structure described by space group R3c. It has two order parameters at room temperature: a ferroelectric ordering with high Curie