Studies of the Magnetic Properties of Ni-Zn-Cu Ferrite and its Synthesis by Using Metal Nitrate Salts

Ni-Zn-Cu ferrite was synthesized by decomposing the metal nitrates Ni(NO3)26H2O, Cu(NO3)23H2O, Zn(NO3)26H2O, and Fe(NO3)39H2O at 200 C for 20 hours. The ferrite powder was calcined at 400 C and pulverized for 3, 6, 9, or 12 hours in a steel ball mill. Then, it was sintered from 700 C to 1000 C in 100 C steps for 1 hour at each step. Thus, we could study the eects of the synthesis conditions on the microstructure and magnetic properties of Ni-Zn-Cu ferrite. We could chemically bond initial specimens in liquid at a low-temperature of 150 C owing to the low melting points, less than 200 C, of the metal nitrates instead of mechanical ball-mill pulverization, thus narrowing the distance between the particles a molecular one and lowering the sintering point at least by 200 C to 300 C. The initial permeability was 50 to 470, and the maximum magnetic induction and coercive force were 0.2410 T and 39.79 A/m to 95.496 A/m, respectively, which are similar to values for Ni-Zn-Cu ferrite synthesized using a conventional process. KCI Citation Count: 2