Preparation of γ-Fe₂O₃/Ni₂O₃/FeCl₃(FeCl₂) Composite Nanoparticles by Hydrothermal Process Useful for Ferrofluids

Table 2

The elemental analysis from XPS for the precursor (a) and the processed sample in 0.25 M (b), 0.50 M (c), and 1.00 M (d) FeCl₂ solution.

Fe	Ni	Cl	Fe : Ni
(a) 55.22	44.78		1.23 : 1
(b) 66.51	23.92	9.57	2.78 : 1
(c) 70.05	13.96	15.99	5.02 : 1
(d) 65.37	10.46	24.17	6.25 : 1