Nanosized NiFe2O4 powders were prepared by a novel sol-gel route. The powders calcined at 1200°C and quenched to liquid nitrogen temperature showed a mixed spinel phase, with a saturation magnetization of 49 emu/g, crystallite size of 67 nm and hyperfine magnetic field B
1 = 520 kOe, B
2 = 484 kOe and A = 488 kOe.
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