Table 1.

XRD analysis and magnetic measurement results of produced samples.

Sample (S)	Gd Content, mol %	Preparation Conditions		X-Ray Phase Analysis Results		Magnetic Measurement Results
		T, °C	tanneal, min	Phase Composition	d, nm	Magnetization at 10 kOe, emu/g	Coercivity Hc, Oe
S1	0	350	30	Fe3O4/γ-Fe2O3 Admixture phase: α-Fe2O3	23 –	55.9	127
S2	0	450	30	Fe3O4/γ-Fe2O3 α-Fe2O3	36 39	19.2	144
S3	0	550	30	α-Fe2O3	45	0.40	1331
S4	0		60	α-Fe2O3	50	0.42	1481
S5	0.5			α-Fe2O3	45	0.89	120
S6	2.5			α-Fe2O3 Fe3O4/γ-Fe2O3	45 30	32.7	87
S7	12.5			Fe3O4/γ-Fe2O3	21	45.7	84
S8	50			Fe3O4/γ-Fe2O3, Gd2O3, Fe2GdO4	– –	18.3	134
S9	75			Fe3O4/γ-Fe2O3, Gd2O3, Fe2GdO4	– –	6.7	120