BaMnZnCoTiW型铁氧体微波吸收特性的研究

Studies of Microwave Absorbing Properties of BaMnZnCoTi W Type Ferrite

对用Ｃｏ２＋ 、Ｔｉ４＋ 置换Ｆｅ３＋ 的ＢａＭｎＺｎＷ 型铁氧体的制备和微波吸收性能进行了分析研究。发现涂层厚为１．０６ｍ ｍ 在７．０～１２．０ＧＨｚ 频率范围内有三个损耗吸收峰，峰值最高达３４ｄＢ以上；同时测量了复数磁导率μ～ （＝ μ′－ ｊμ″） ，复介电常数ε～ （＝ ε′－ ｊε″） ，求出了磁损耗角正切ｔｇδｍ 和介电损耗角正切ｔｇδｅ ，初步分析了三个损耗吸收峰可能产生的机制；比较了在相同工艺条件下，随Ｃｏ２＋ 、Ｔｉ４＋ 含量增加。

In this paper, the preparation of BaMnZn W type hexagonal plane crystal microwave absorbing materials and their absorption properties have been studied and analysized by substituting Fe 3+ ions with Co 2+ and Ti 4+ ions. It is found that when the coat thickness is 1.06 mm, three loss absorption peaks appear in the range of 7～12GHz frequencies and the maximum absorption is above 34dB. In the meantime, the complex permeability μ～(=μ′- j μ″) and the complex permittivity ε～(=ε′- j ε″) are measured, and the magnetic loss  tg δ m  and the dielectric loss  tg δ e  have been determined, by which the possible origin of the three loss absorption peaks has been preliminarily discussed. With increasing the contents of Co 2+ and Ti 4+ ions in the materials prepared with the same process the frequency and coat thickness dependence of absorption properties has also been compared.