Table 1: Refinement by Rietveld of A-I, A-II and A-III ferrites calcineds at 1100 ℃/3h.

Phase % of Phase Lat. Par. (a)(Å) Cs (µm) Rw Sig
A-I NiZn Ferrite 95 ± 2.1 8.39 1.03 ± 0.08 26.16 1.22
Hematite 5.0 ± 0.2 5.43 0.54 ± 0.06
A-II NiZnMn Ferrite 100 8.41 0.61 ± 0.03 26.05 1.25
A-III MnZn Ferrite 88 ± 1.3 8.45 1.14 ± 0.10 29.51 1.32
Hematite 12 ± 0.32 5.42 0.49 ± 0.05