A Simple and Reliable Synthesis of Superparamagnetic Magnetite Nanoparticles by Thermal Decomposition of Fe(acac)₃

Table 2

Isomer shift (IS), quadrupolar splitting (QS), hyperfine field (), and full width at half maximum (WID) values obtained from the fittings of the Mossbauer spectra of the study samples. %Fe denotes the obtained ratio of the resonant areas among Fe³⁺ A sites and the Fe^2+/3+ B sites of the magnetite.

(a)

(K)	MNP-I
	Position	IS (mm/s)	QS (mm/s)	(T)	WID (mm/s)	%Fe
295	Magnetite Fe^3+ (A)	0.32 (1)	0.00 (1)	47.0 (1)	0.61 (1)	34 (1)
	Magnetite Fe^2+Fe^3+ (B)	0.59 (1)	-0.02 (1)	43.1 (1)	1.00 (1)	66 (1)
150	Magnetite Fe^3+ (A)	0.38 (1)	0.00 (1)	48.9 (2)	0.53 (1)	37 (1)
	Magnetite Fe^2+Fe^3+ (B)	0.64 (1)	-0.03 (1)	45.5 (1)	0.90 (1)	63 (1)

(b)

(K)	MNP-II
	Position	IS (mm/s)	QS (mm/s)	(T)	WID (mm/s)	%Fe
295	Magnetite Fe^3+ (A)	0.30 (1)	0.00 (3)	48.1 (1)	0.41 (1)	34 (1)
	Magnetite Fe^2+Fe^3+ (B)	0.62 (1)	-0.01 (1)	44.9 (1)	0.65 (1)	66 (1)
150	Magnetite Fe^3+ (A)	0.37 (1)	0.02 (1)	49.7 (1)	0.43 (1)	33 (1)
	Magnetite Fe^2+Fe^3+ (B)	0.69 (1)	0.00 (1)	46.7 (1)	0.70 (1)	67 (1)