High-frequency dielectric behaviour of gadolinium substituted Ni-Zn ferrites

摘要

Dielectric constant (ε) and dielectric loss tangent (tanδ) of gadolinium substituted Ni-Zn ferrites have been investigated in the high frequency range 1-15 MHz by an HP 4192A impedance analyser controlled by a PC. The values of complex dielectric constant (ε) have been computed from εand tan δ. Plot of ε and tanδ vs. Frequency show a normal dielectric behaviour of spinel ferrites. A qualitative explanation is given for the composition and frequency dependence of dielectric constant and dielectric loss tangent.