Journal of Chemistry

Research Article

Formation of Fe(0)-Nanoparticles via Reduction of Fe(II) Compounds by Amino Acids and Their Subsequent Oxidation to Iron Oxides

Table 2

Spectral parameters derived from Mössbauer spectra of the investigated samples: —spectral area, —isomer shift, —hyperfine field (only for sextets).


Sample	Component	(mm s⁻¹)	B _hf (T)	A (%)

(1) Gly	α-Fe₃O₄ (magnetite)	0.42	49.0	12
	β-Fe₃O₄ (magnetite)	0.45	44.6	6
	γ-Fe₂O₃ (maghemite)	0.42	47.0	18
	α-FeOOH (goethite)	0.52	33.9	41
	high spin Fe³⁺	0.35	0.60*	11
	low spin Fe(III)	0.42	1.10*	12

(2) Ala	α-Fe₃O₄ (magnetite)	0.35	49.4	12
	β-Fe₃O₄ (magnetite)	0.45	45.8	19
	γ-Fe₂O₃ (maghemite)	0.32	47.8	15
	α-FeOOH (goethite)	0.39	32.6	53
	high spin Fe³⁺	0.35	0.60*	1

(3) Glu	α-Fe₃O₄ (magnetite)	0.26	49.0	4
	β-Fe₃O₄ (magnetite)	0.67	46.0	3
	γ-Fe₂O₃ (maghemite)	0.32	47.7	21
	α-FeOOH (goethite)	0.36	33.5	55
	high spin Fe³⁺	0.34	0.60*	17

(4) Phe	γ-Fe₂O₃ (maghemite)	0.32	48.2	18
	α-FeOOH (goethite)	0.35	33.3	44
	high spin Fe³⁺	0.36	0.53*	29
	low spin Fe(III)	0.36	0.97*	9

(5) Trp	γ-Fe₂O₃ (maghemite)	0.30	47.6	9
	α-FeOOH (goethite)	0.40	32.3	56
	high spin Fe³⁺	0.36	0.58*	35
	-Fe₂O₃ (maghemite)	0.32	47.8	10
	-FeOOH (goethite)	0.27	29.7	32

Quadrupole splitting (mm s⁻¹).