XPS study on the correlation of magnetic properties and site occupancy of Al doped SrFe12O19

Influence of post‐synthesis NaCl flux treatment on the magnetic properties of jet‐milled SrFe12O19 powders

“…Fe 2p 3/2 and 2p 1/2 are positioned around 711 and 725 eV with satellite peaks observed at 719 and 733 eV in all the samples. These values agree well with those reported for SrFe 12 O 19 41 and other Fe 3+ -based oxides. 42 The difference of 8 eV between Fe 2p 3/2 peak and the satellite peak confirms that Fe is present in 3+ oxidation state.…”

“…There is no signature of Fe 2+ in the spectrum indicating that the chemical nature of the compound remains unchanged even after NaCl flux treatment. The major peak at around 531 eV observed in O 1 s spectra of all the samples corresponds to the oxide ion in hexaferrite compound 41 . The other minor peaks at lower energies could be due to adsorbed species 43 .…”

“…The major peak at around 531 eV observed in O 1s spectra of all the samples corresponds to the oxide ion in hexaferrite compound. 41 The other minor F I G U R E 5 (Color online): Sr 3d, Fe 2p and O 1s core shell x-ray photoelectron spectra of (A) AS-CALC, (B) FX40-1050, (C) NOFX-1050, and (D) FX-CALC samples. Open circles represent the data, solid and dotted lines in the de-convoluted peaks are used to denoted different spectral components and satellite peaks peaks at lower energies could be due to adsorbed species.…”

Width-controlled M-type hexagonal strontium ferrite (SrFe12O19) nanoribbons with high saturation magnetization and superior coercivity synthesized by electrospinning

“…The calculated values are basically similar to the cell parameters ( a = 5. 869 Å, c = 23.007 Å and V = 686.307 Å 3 ) of SrFe 12 O 19 nanoparticles reported by R. K. Sahu 33 . It is also observed that there is a slight line broadening of some characteristic peaks from S1 to S3, which indicates a reduction in grain size.…”

“…No peaks of other additional phases are detected, indicating that these SrFe 12 O 19 samples are highly purified. Based on these diffraction peaks, the lattice parameters ( a , c and V ) of S1–S3 are calculated ( Table 1 ) by using the follow equations for the hexagonal crystal system 33 :…”