【摘要】 以金属离子的柠檬酸盐为前驱体,通过sol-gel自燃烧的合成方法制备了镍锌铁氧体(Ni0.8Zn0.2Fe2O4)纳米晶体.采用FT-IR、DSC-TG、XRD、TEM波导等方法对产物以及产物的电磁性能进行了表征.结果表明,在前驱体中,金属离子与柠檬酸以络合物的形式存在.凝胶在220℃完成自燃烧反应.随着热处理温度的升高,粉体的粒径逐渐增大.纳米晶体在8-12GHz的测试条件下具有介电损耗与磁损耗.随着涂层厚度的增加,混合媒质的微波反射率逐渐增加,反射率吸收峰随着厚度的增加向低频移动.更多还原

【Abstract】 The nanocrystalline Ni0.8Zn0.2Fe2O4 was synthesized by a sol-gel auto-combustion method using citric acid as the chelating agents. The analysis methods of FT-IR, XRD, DSC-TG, TEM, wave-guide were used to character the gel and the products. The phenomena of melt, combustion and forming crystal for gel were investigated in the processes of thermo-decomposition. The results show that metal ions and carboxyl are coordinated by the oriented manner. The temperature of decomposition for the gel is 220℃, and the nanocrystalline is formed after the combustion of the gel. The mixture, which consists of Ni0.8Zn0.2Fe2O4 nanocrystalline and paraffin, has both dielectric loss and magnetic loss in the frequency range of 8-12GHz. The reflectivity of spinel nanocrystalline increases and the reflectivity absorption peaks shift from high frequency to low frequency with the increase of thickness.更多还原