The dielectric constants and dielectric loss tangents of Li-Ti ferrites of different composition were measured at room temperature using a capacitance bridge at low frequencies. It was observed that the lower concentration of titanium (<0.6 mole of Ti) had minimal effect on the value of the dielectric constant, while for higher (>0.6 mol. of Ti) titanium dopants, the value of dielectric constant decreased very rapidly. For some compositions, the dielectric loss tangent curves exhibited a maximum at frequencies between 3 and 15 kHz. A qualitative explanation for the observed behaviour is given.
Electrical conductivity of some LiTi mixed ferrites is studied as a function of composition and temperature. Electrical conductivity of all the ferrites is found to increase with increasing temperature with a change of the slope at magnetic transition temperature (Tc). Activation energies of all the samples are found to be very high. An attempt is made to explain the conduction mechanism in these samples.
Dielectric measurements of cobalt substituted W-type barium–zinc hexagonal ferrites are undertaken both as a function of frequency and temperature. The dielectric constant is found to decrease continuously with increasing frequency while it increases continuously with increasing temperature. The variation of dielectric constant with dopants concentration is explained on the basis of magnetic cation orientation. From the temperature variation of dielectric constant two transitions, one due to the spin reorientation in the temperature range 450–500 K and the other one due to a ferri to paramagnetic transition have been observed. Suitable explanations for the observed behavior are given.
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