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(a) Schematic of the crystal structure of pure SrFe12O19 hexaferrite. (b) XRD patterns of SrFe12–xNbxO19 (x = 0.00 and 0.03) ceramics within the selected 30–60° range; indexing was performed based on the reference standard SrFe12O19 (ICSD no. 69022). Inset: enlarged view of XRD patterns within 30–40°. (c, d) SEM images of the thermally etched ceramics with x = 0.00 and 0.03 ceramics, respectively.
