Production, structure and magnetic properties of nanocomposites based on the perovskite phase LaFeO3

The phase relations in the La2O3-Fe2O3 2 O 3 -Fe 2 O 3 system at 1300 degrees C were studied in the whole concentration range by Xray diffraction (XRD) and scanning electron microscopy (SEM). The samples were prepared with a concentration step of 1-5 mol %. The isothermal cross-sections of the La2O3-Fe2O3 2 O 3 -Fe 2 O 3 phase diagram at 1300 degrees C are characterized by the presence of three single-phase (A-La2O3 , 2 O 3 , LaFeO3 , 3 , Fe2O3), 2 O 3 ), two two-phase (A-La2O3+LaFeO3 , 2 O 3 +LaFeO 3 , LaFeO3+Fe2O3) 3 +Fe 2 O 3 ) regions. The composition corresponding to the perovskite phase is 49 mol % La2O3-51 2 O 3 -51 mol % Fe2O3. 2 O 3 . Nanocomposites based on the perovskite phase (LaFeO3) 3 ) were obtained by the Pechini method and heterogeneous precipitation from nitrate solutions. Solutions of La3+ 3+ nitrates, which were obtained by dissolving lanthanum oxide with a content of the main component of 99.99 % in nitric acid. The influence of the production method on the microstructure, morphology, and magnetic properties of nanopowders (LaFeO3) 3 ) was studied. According to XRD, infrared spectroscopy, SEM, and TEM, the synthesized perovskite LaFeO3 3 is single-phase with a particle size of 50-60 nm. The morphology of powder particles primarily depends on the method of material synthesis. The powder showed ferrimagnetic magnetic properties and had a specific magnetization 0.2 and 0.15 emu/g.