Effects of Chromium(III) Ion Doping on Structural, Optical, and Magnetic Properties of Nickel–Cobalt Ferrite Nanoparticle

Table 1

Values of crystallite size (D), lattice parameters, X-ray density, and tolerance factor.

Sample	Tolerance factor, t	Crystallite size, D (nm)	Lattice parameters, a = b = c (nm)	Volume of a unit cell (nm^3)	X-ray density (g/cm^3)
Ni0.5Co0.5Fe2O4	0.8499	39.54	0.8324	0.5767	5.322
Ni0.5Co0.5Cr0.1Fe1.9O4	0.8462	37.57	0.8320	0.5759	5.461
Ni0.5Co0.5Cr0.2Fe1.8O4	0.8422	30.42	0.8314	0.5745	5.603