Effects of Milling Atmosphere and Increasing Sintering Temperature on the Magnetic Properties of Nanocrystalline Ni_0.36Zn_0.64Fe₂O₄

Table 1

Lattice parameter, theoretical density, experimental density, porosity, and grain size for milled samples in air, argon, and oxygen atmospheres sintered in the range temperature of 500–900°C.

Mill atmosphere	Sintering temperature (°C)	Lattice parameter (Å)	Theoretical density (X-ray density) (g/cm^3),	Experimental density; (g/cm^3),	Porosity (%); 1 − (/)  ×  100%	Grain size; (μm)
Argon	500	8.4023	5.12	4.78	6.64	0.075
	600	8.4030	5.12	4.80	6.25	0.110
	700	8.4016	5.12	4.85	5.27	0.161
	800	8.3998	5.12	4.88	4.69	0.195
	900	8.4025	5.12	4.92	3.91	0.243
Air	500	8.4086	5.12	4.72	7.81	0.083
	600	8.4027	5.12	4.76	7.03	0.127
	700	8.4022	5.12	4.79	6.44	0.176
	800	8.4025	5.12	4.84	5.47	0.211
	900	8.4031	5.12	4.90	4.30	0.284
Oxygen	500	8.3813	5.15	4.68	9.13	0.105
	600	8.3885	5.14	4.74	7.78	0.138
	700	8.3945	5.14	4.79	6.81	0.199
	800	8.3959	5.14	4.81	6.42	0.224
	900	8.3948	5.13	4.85	5.46	0.302