Technological Conditions and Magnetic Properties of Y-type hexaferrite Prepared by chemical Co-Precipitation Method

The Y-type hexaferrite precursors was synthesized by co-precipitation, and the pivotal technological conditions, including pH value, temperature (T), rotate speed (R) and the flow velocity of salt solution (V) were discussed. The particles of precursors were studied by Laser particle size analyzer (LPS). The precursor calcined at 900 degrees C was characterized via X-ray Diffraction (XRD), the vibrating sample magnetometer (VSM) and HP4291A impedance analyzer were used to investigated magnetic properties. The results showed that the particle sizes were around 3 mu m (D50) and the distribution range was from 2.28 mu m to 4.47 mu m, in the optimized technological conditions: pH = 10.50, T = 50 degrees C, R = 300 rpm, V = 0.35 ml/min, SDBS = 0.3 g/L, the specific saturation magnetization, coercive force, residual magnetization, initial permeability and factor of quality of the sample were as approximate to 29.72A.m(2).kg(-1), H-c approximate to 4.11/kA.m(-1), sigma(r) approximate to 7.74 A.m(2).kg(-1), mu(i) approximate to 9 and Q approximate to 18 respectively.