Effect of low sintering temperature on the structural and magnetic properties of M-type strontium hexaferrite

A pure M-type strontium hexaferrite with nominal composition SrFe12O19 has been prepared via the modified conventional citrate precursor method. The entire work emphasizes on improving the standard of hexagonal ferrite without undergoing high-temperature thermal treatments. By incorporating some adjustments in processing conditions, the prepared sample is sintered at 800 degrees C and 910 degrees C, identified through thermal gravimetric analysis (TGA/DTA). The impact of the low-temperature sintering process on structural, spectroscopic, and magnetic properties are investigated via using different characterization techniques like XRD, FESEM, FTIR, Raman spectroscopy (RS), and VSM respectively. The XRD confirmed the formation of the M-phase along with some impurities of Fe2O3 and these results are strongly supported via both FTIR and RS. Similarly, FESEM analysis confirmed the formation of densely packed grains some hexagonal platelets. The magnetic properties of SrM hexaferrites show the increment of saturation magnetization Ms from 81 emu/g to 92 emu/g as the sintering temperature increases from 800 degrees C to 910 degrees C. Apart from the higher Ms for SrM hexaferrite, the Hc values 107 Oe and 262 Oe respectively are the vital findings of this research. This rare nature of SrM hexaferrite signifies the erection of soft character in hard SrM hexaferrites. Moreover the abrupt increase in the squarenes ratio (SQR) from 0.26 to 0.54 represents the transformation from multidomains to single domain. Material with such properties can be utilized in switching devices, recording media, high frequency applications.

Automated summary

In this study, a pure M-type strontium hexaferrite has been prepared without high-temperature thermal treatments. The low-temperature sintering process has been investigated for its impact on the structural, spectroscopic, and magnetic properties. The results show an increase in saturation magnetization as the sintering temperature increases. The unique properties of this hexaferrite make it suitable for applications in switching devices, recording media, and high-frequency applications.