Ni0.6Zn0.4Fe2O4铁氧体纳米晶与微米晶300MHz～2GHz的磁导率比较

摘要

用水热法制备了平均晶粒尺寸为40 nm 的Ni0.6Zn0.4Fe2O4铁氧体八面体颗粒，同时采用溶胶-凝胶高温烧结法合成 Ni0.6Zn0.4Fe2O4微米晶颗粒。用矢量网络分析仪测试了铁氧体/石蜡混合材料在300MHz~2GHz频段的复磁导率和复介电常数。实验结果表明Ni0.6Zn0.4Fe2O4铁氧体纳米晶粒样品与微米晶样品相比具有更高的磁导率（实部 rµ′在3.3～1.65之间，磁导率虚部 rµ′在1.1左右）、更大的磁损耗以及更优异的微波吸收特性。%Ni0.6Zn0.4Fe2O4 ferrite octahedral nanoparticles with mean crystallite size of about 40 nm were synthesized via hydrothermal route, and the Ni0.6Zn0.4Fe2O4 microcrystalline particles were also synthesized by sol-gel high temperature sintering method. In 300MHz-2GHz frequency range, the complex permeability and permittivity for Ni0.6Zn0.4Fe2O4/wax composites were measured by vector network analyzer. The results showed that Ni0.6Zn0.4Fe2O4 nanoparticle sample presents higher microwave permeability, magnetic loss tangent and more excellent microwave absorption property than microcrystalline sample.