Effect of sintering temperature and soaking time on the magnetic properties and transmission behavior of nano crystalline Mg0.8Mn0.2Al0.1Fe1.9O4

In this study, Mg-Mn-Al ferrite with a chemical composition of Mg0.8Mn0.2Al0.1Fe1.9O4 was synthesized via the sol-gel auto-combustion method. The effects of the sintering time and temperature on the magnetic properties and transmission behaviors were investigated in detail. X-ray diffraction (XRD) results revealed that the powders in the as auto-combusted state were in an amorphous state. Moreover, based on the differential thermal analysis (DTA) curve, the calcination temperature was calculated to be similar to 900 degrees C. According to the Archimedes equation, the highest density was obtained for the specimen sintered at 1250 degrees C for 5 h (94% of the theoretical density). In addition, permagraph results revealed the average magnetic properties of the mentioned samples are as follows: H-c = 7.0 Oe and M-s = 1400 G. According to vector network analyzer (VNA) results, the samples with qualified transmission behaviors showed low scattering parameters in a wide range of frequencies.