Magnetic properties of nickel-zinc ferrites prepared by the citrate precursor method

Magnetic properties such as Curie temperature, saturation magnetisation, hysteresis loop and permeability loss factor of various compositions of NiZn ferrites prepared by the non-conventional citrate precursor method are reported. The optimum properties are obtained for samples sintered at 1200 degrees C. The significant advantages of this method of preparation are: (i) the low relative loss factor, tan delta/mu(i), of the order of 10(-4)-10(-5) in the frequency range 100 kHz to 8 MHz, depending upon the composition, (ii) reduction in the sintering temperature by atleast 100 degrees C and(iii) reduction in the sintering time from more than 3 h for the conventional method to Ih in the present method. (C) 2000 Elsevier Science B.V. All rights reserved.