Indium ion doped hexagonal crystal system M-type barium ferrite gyromagnetic material and preparation method thereof

Abstract

The invention provides an indium ion doped hexagonal crystal system M-type barium ferrite gyromagnetic material and a preparation method thereof. The chemical formula of the material is BaFe<12-2x>In<x>O<19>, wherein x = 0.1, 0.2, 0.25, 0.3, 0.4, 0.5, 0.6, 0.7, 0.75, 0.8, 0.9, 1, 1.2, 1.3 and 1.4. The method comprises the following steps: (1) taking BaCO3, Fe2O3 and In2O3 as raw materials; (2) adding a prepared sample mixture, water and large and small balls for ball milling into a ball milling tank, and carrying out ball milling for the first time; (3) drying and sieving the slurry obtained by ball milling in the previous step, then putting the slurry into a sagger for compaction, and pre-sintering the slurry; (4) mixing the pre-sintered material obtained in the previous step with water for secondary ball milling; (5) drying, granulating and sieving the slurry obtained in the previous step, and pressing into rings and sheets by virtue of a mold; (6) sintering the pressed blank. According to the invention, the technical process parameters of a traditional solid-phase reaction method are optimized, so that the method is reliable, and the sample obtained through the method is stablein performance and suitable for large-scale production in factories.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials, specifically In 3+ Doped hexagonal M-type barium ferrite gyromagnetic material and preparation method thereof. Background technique [0002] In recent years, wireless communication technology is changing with each passing day. In order to realize the miniaturization and integration of electronic communication systems, it is required that passive devices be smaller in size and lighter in weight. And in these applications, the radio antenna is one of the important components. Therefore, how to effectively reduce the size of the antenna has become a key factor for its application in mobile devices or small-scale systems. An effective way to reduce the size of the antenna is to find a high dielectric constant and high resistivity material. [0003] Ferrite materials generally have relatively high magnetic permeability and relatively high resistivity, and are suitable materials for miniat...

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Problems solved by technology

Among the ferrite materials for antennas, although spinel ferrite has relatively high magnetic permeability, its cut-off frequency is lower than 300MHz due to the limitation of Sneok constant rate, which greatly limits its application frequency. , generally cannot exceed 100MHz

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