Sublattice magnetizations and textures in SrFe12O19 ceramic compacts

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Abstract
57Fe Mössbauer spectroscopy has been used to determine the degree of orientation and magnetic hyperfine fields in SrFe12O19 ceramic compacts with known bulk magnetic properties. The controversy regarding the assignment of the spectrum to the different sites has been resolved and at 300 K the hyperfine fields for the 4f2, 4f1, 2a, 12k, and 2b sites are 515, 490, 490, 414, and 426 kOe, respectively. This assignment is slightly different from that in BaFe12O19. The 2b site quadrupole splitting of 2.6 mm s−1 is also larger than in BaFe12O19 in agreement with the relative anisotropy fields. Oriented specimens with BΓ and Hc of 3700 G and 3600 G, respectively, still show significant deviations from complete alignment, suggesting that the intrinsic material properties of these ceramic compacts are superior to those reported for individual crystallites of SrFe12O19.