Table 3.

Fe²⁺/Fe³⁺ molar ratio determined by elemental analysis and quantitative crystalline phases determined by the Rietveld method for the synthesized products.

Sample	Fe2+/Fe3+ Molar ratio	Magnetite (wt %)	Maghemite (wt %)	Hematite (wt %)
S1	0.48	98.0	1.5	0.5
S2	0.47	96.7	2.9	0.4
S3	0.45	95.5	4.2	0.3
S4	0.46	96.1	3.3	0.6
S5	0.43	93.9	5.8	0.4
F1Na	0.49	98.2	1.6	0.2
F3Na	0.44	94.0	5.5	0.5
F5Na	0.42	91.1	8.7	0.2
F3K	0.43	92.3	6.3	0.4
F3TEA	0.41	90.3	9.4	0.3