o C after a pre-firing at a temperature of 650 o C. Various characterizations using T C set up, BH loop tracer were carried out on the sintered samples. The X-ray diffraction pattern confirmed the formation of spinel phase. Magnetic properties such as Curie temperature using T C set up, BH loop parameter and complex permeability using BH loop tracer were studied. Experimental results show that the Curie temperature, saturation magnetization and initial permeability decreases with the increase in the Ni 2+ concentration. The complex permeability measured as a function of frequency in the range of 20Hz-2MHz show dispersion. Possible mechanism contributing to the above process is being discussed.
Ni substituted Li-Zn ferrites with compositional formula Li 0.4-0.5x Zn 0.2 Ni x Fe 2.4-0.5x O 4 where 0.02 ≤ x ≤ 0.1 in steps of 0.02 was synthesized by using citrate precursor method. X-ray diffraction was used to confirm the spinel phase. A series of sample was given sintering at 1080°C and another series given sintering at 1080°C after a presintering at a temperature of 600°C. The dielectric constant was investigated as a function of composition and frequency for the two series. Room temperature dielectric constant showed a decrease with addition of Ni 2+ ions. It was explained in terms of space charge polarization and koops two layer model. For both the series the variation in dielectric constant with frequency showed dispersion. The possible mechanism responsible for the above behavior is being discussed.
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