Table 1.

Physicochemical features of Zn(Fe)O bare nanoparticles (NPs). Composition, size, cell parameters and proposed stoichiometry. Rietveld refinements for NPs with R_Fe = 0.35 and 0.50 have been performed with the stoichiometry established from chemical analysis. For R_Fe,i = 0.50, weight ratio of crystal phases = W/S = 55.1/44.9, volume ratio of crystal phases = 33.4/66.6.

RFe,i	RFe,f a	TEM		XRD		Stoichiometry b
		Size (nm)	PDI	Size (nm)	Lattice Parameters
0.05	0.06	7.0 ± 0.8	0.11	5.9 ± 0.2	Wurtzite a: 0.325839 ± 6.68 × 10−5 c: 0.53225 ± 2.05 × 10−5	Fe0.06Zn0.94O
0.15	0.18	7.0 ± 1.0	0.14	6.7 ± 0.2	Wurtzite a: 0.327126 ± 4.6 × 10−5 nm c: 0.52281 ± 1.156 × 10−5 nm	Fe0.18Zn0.82O
0.35	0.42	6.3 ± 0.2	0.03	5.8 ± 0.2	Wurtzite a: 0.327094 ± 2.83 × 10−5 nm c: 0.531681 ± 2.83 × 10−5 nm	Fe0.42Zn0.58O
0.50	0.57	4.2 ± 0.6	0.14	4.1 ± 0.1	Wurtzite a: 0.32499 ± 1.78 × 10−4 nm c: 0.530024 ± 3.87 × 10−4 nm	Fe0.54Zn0.46O c 44.9% (w/w)
				3.8 ± 0.4	Cubic a: 0.84752 ± 1.15 × 10−4 nm	ZnFe2O4 d 55.1% (w/w)

^a obtained by atomic absorption (±0.01), ^b see ESI for the determination of stoichiometry, ^c wurtzite phase (W), ^d spinel phase (S).