Crystallographic, Morphological, Magnetic, and Thermal Characterization of Superparamagnetic Magnetite Nanoparticles (Fe₃O₄) Synthesized by Chemical Coprecipitation Method and Calcined at 250°C for 4 hr

Table 1

Crystallographic properties of Fe₃O₄ nanoparticles.

S. no.	2θ (°)	h k l	d (Å)	Lattice parameter (Å)	Crystallite size (nm)	Dislocation density (line/m^2)	Microstrain (ppm)
1	30.25	220	2.952	8.349	19.534	2.620 × 10^15	0.0071
2	35.65	311	2.516	8.344	34.862	8.227 × 10^14	0.0033
3	36.37	222	2.468	8.549	2.599	1.480 × 10^17	0.0446
4	43.15	400	2.095	8.380	12.057	6.878 × 10^15	0.0081
5	62.78	440	1.479	8.366	19.439	2.646 × 10^15	0.0035
Average				8.398	17.698	3.219 × 10^16	0.0133