关键词: Cu-Zn ferrite, dielectric behavior, Si additive

Abstract: Since ferrites are highly sensitive to the additives present in or added to them, extensive work, to improve the properties of basic ferrites, has been carried out on these aspects. The present paper reports the effects of composition, frequency, and temperature on the dielectric behavior of a series of Cu_xZn_1-xFe₂O₄ ferrite samples prepared by the usual ceramic technique. In order to improve the properties of the samples, low cost Fe₂O₃ having 0.5 wt.% Si as an additive is selected to introduce into the system. The dielectric constant increases by increasing the Cu content, as the electron exchange of Cu²⁺<=>Cu⁺ is responsible for the conduction and the polarization. However, the addition of Si could decrease the dielectric constant as it suppresses the ceramic grain growth and promotes the quality factor at higher frequencies. Dielectric constant ε' and loss tangent tanδ of the mixed Cu-Zn ferrite decrease with increasing frequency, attributed to the Maxwell-Wagner polarization, which increases as the temperature increases.

Key words: Cu-Zn ferrite, dielectric behavior, Si additive