Aqueous Synthesis of Ru Doped Hematite Nanostructures: A Morphological, Structural, Optical, and Magnetic Study

Table 2

Mössbauer parameters (isomer shift (CS), quadrupole splitting (QS), hyperfine field (H), line width (HWHM), and area fraction (A)) extracted from the fits to the spectra displayed in Figures 6 and 7, of the Ru doped α-Fe₂O₃ samples synthesized with the precursor concentrations shown. The isomer shifts are expressed relative to α-Fe.

Sample	Component	CS	QS/e	H	G/2	A
		(mm/s)	(mm/s)	(T)	(mm/s)	(%)
(a) As-synthesized
0.006 g	D1	0.37 (1)	0.70 (5)	—	0.32	59 (3)
	B1	0.5 (1)	−0.2 (1)	3.66 (2)	0.70	41 (4)
0.018 g	D1	0.37 (1)	0.68 (1)	—	0.34	78 (4)
	B1	0.3 (1)	−0.1 (1)	3.25 (8)	0.60	22 (4)
0.030 g	D1	0.37 (1)	0.40 (4)	—	0.38	69 (2)
	D2	0.38 (2)	1.28 (5)	—	0.30	31 (3)
α-Fe2O3	B1	0.355 (6)	−0.11 (1)	5.156 (3)	0.18	100
Annealed at 500°C
0.006 g	B1	0.36 (1)	−0.12 (1)	5.16 (1)	0.17	100
0.018 g	B1	0.36 (1)	0.02 (2)	5.11 (2)	0.19	49 (2)
	B2	0.33 (2)	0.16 (2)	5.24 (2)	0.14	19 (2)
	B3	0.43 (2)	0.36 (3)	4.20 (6)	0.35	18 (2)
	B4	0.26 (2)	−0.06 (3)	4.22 (6)	0.35	14 (2)
0.030 g	B1	0.36 (4)	0.34 (2)	5.12 (2)	0.15	70 (2)
	B2	0.30 (4)	−0.05 (6)	5.26 (2)	0.14	30 (2)