Crystal Structure, Magnetic Properties and Thermal Behavior of BaFe_11.9In_0.1O₁₉ Ferrite

Herein, the crystal structure, surface morphology, and magnetic and thermal properties of the BaFe_11.9In_0.1O₁₉-substituted M-type hexaferrite are investigated. This solid solution is fabricated using “two-step” topotactic reactions. It is determined through the X-ray diffraction method that the crystal structure of this solid solution under normal conditions has hexagonal symmetry with P6₃/mmc space group (No. 194) with the unit cell parameters a = 5.8992(1) Å and c = 23.2275(7) Å. It is determined by the scanning electron microscope (SEM) researches that the average size of the grains is (Formula presented.) = 6 μm. It is determined by the vibration magnetometry that the ferrimagnet–paramagnet phase transition happens at around T _C = 420 °C. Using differential scanning calorimetry (DSC), it is found that air and water molecules leave the sample surface up to 420 °C and the resulting oxygen anions appearing as a result of a solvothermal reaction fill the oxygen vacancies in the crystal structure at high temperatures up to 800 °C. The thermal transitions repeated in the high temperatures are established. The oxidation behavior of this compound is determined from thermogravimetric analysis (TGA) in a wide temperature range.