Optical, X-Ray Diffraction, and Magnetic Properties of the Cobalt-Substituted Nickel Chromium Ferrites (CrCo_𝑥Ni_1−𝑥FeO₄, 𝑥=0,0.2,0.4,0.6,0.8,1.0) Synthesized Using Sol-Gel Autocombustion Method

Table 1

Lattice parameters, saturation magnetization, coercivity, and energy band gap of the ferrites after annealing at 1000°C.

Ferrites composition	Lattice parameter, a (Å)	Volume; (Å)	Saturation magnetization, Ms  (emu/ g)	Coercivit; Hc (Oe)	Energy band gap, Eg (eV)
CrNiFeO4	8.2974	571.24	4.32	1500	2.30
CrNi0.8Co0.2FeO4	8.3026	572.32	9.75	290	2.27
CrNi0.6Co0.4FeO4	8.3143	574.75	14.86	240	2.73
CrNi0.4Co0.6FeO4	8.3321	578.45	17.70	190	2.82
CrNi0.2Co0.8FeO4	8.3567	583.59	19.85	130	2.62
CrCoFeO4	8.3736	587.13	13.28	38	2.50