Rietveld refinement parameters of annealed CoFe₂O₄ nanoparticles at 300 °C, 500 °C, 700 °C and 900 °C.

Sample	χ2	R B	R F	R WP	R exp	R P	V (Å3)	a = b = c (Å)
a	1.08	0.189	0.124	46.5	44.72	48.4	577.748 (±0.392)	8.328
b	1.48	3.925	2.483	45.0	37.02	34.6	581.657 (±0.000)	8.347
c	1.79	5.660	3.696	52.0	38.87	40.0	585.413 (±0.193)	8.365
d	1.90	5.538	4.016	54.2	39.31	41.8	586.475 (±0.077)	8.370