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采用固相反应法制备了ZnO前驱体,在不同煅烧温度和保温时间分解得到ZnO粉体。用扫描电镜和X射线衍射仪表征合成粉体。采用矢量网络分析仪测试ZnO粉体在8.2～12.4 GHz的微波介电性能。结果表明:在不同煅烧温度和保温时间,前驱体均分解生成ZnO粉体。低温时,得到的样品颗粒大小均匀一致:随着温度的升高,颗粒逐渐长大,但均匀性变差。保温时间对样品颗粒大小的影响不明显。样品介电常数的实部(ε′)和虚部(ε″)随温度的升高先增大后减小,700℃时,达到最大;而随保温时间的增加,(ε′)和(ε″)的变化不显著。对产生介电损耗的机理进行了讨论,并提出改善介电性能的途径。
ZnO precursors were prepared by solid-state reaction method, and ZnO powders were decomposed at different calcination temperature and holding time. The synthesized powders were characterized by scanning electron microscopy and X-ray diffraction. The microwave dielectric properties of ZnO powder at 8.2 ~ 12.4 GHz were measured by a vector network analyzer. The results show that the precursors decompose to ZnO powder at different calcination temperature and holding time. At low temperatures, the particle size of the resulting sample was uniform: as the temperature increased, the particles grew larger but the uniformity deteriorated. Insulation time on the sample particle size is not obvious. The real part (ε ') and the imaginary part (ε ") of the permittivity firstly increase and then decrease with the increase of temperature, and reach the maximum at 700 ℃. However, with the increase of holding time, (ε' ) Did not change significantly. The mechanism of dielectric loss is discussed, and the ways to improve the dielectric properties are proposed.