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MMM 2022

November 07, 2022

Minneapolis, United States

Understanding of the Phase Evolution with Temperature in Pure SrM, BaM and CaM

Structural changes and evolution taking place in ferrites with increasing processing temperature are crucial from their performance point of view. Three M-type hexaferrites were prepared using solid-state reaction at 650-1250 °C: SrFe12O19 (SrM), BaFe12O19 (BaM), and CaFe12O19 (CaM). The evolution of phases was studied with X-ray powder diffraction and thermogravimetry investigation. The structural studies reveal that the formation M-type phase begins at 820, 850, and 1200 °C, respectively, and different mid-phases of SrFe3-x, BaFe2O4, and CaFe2O4 were formed. The structural studies in all cases were successfully refined using the P63/mmc (No.194) space group but Ca2+ shrank the hexaferrite crystal lattice. Their magnetic properties were studied with respect to their composition and microstructure by scanning electron microscopy (SEM). The different phase evolution leading to the different magnetic properties of M-type hexaferrite were discussed in the present work.

Table 1 The phase evolution with the temperature of SrM, BaM and CaM

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