【摘要】 通过对多晶Li系铁氧体和YIG的微波介电损耗的研究,认为固有电偶极子取向极化弛豫和介面极化弛豫是多晶铁氧体微波介电损耗的主要来源。同时,指出降低多晶铁氧体微波介电损耗的主要途径是:①抑制晶格中离子空位的产生、高价或低价杂质离子的混入,以及防止高导电相的出现;②减少宏观或微观的不均匀性(如气孔、另相等)。更多还原

【Abstract】 Through the research of Microwave Dielectric Loss of polycrystalline ferrites of Lithium System and Yittrium Iron Garnet, we find that the directional polariza-tion relaxation of intrinsic electric dipole and interfacial polarization relaxation are the main resources of Microwave Dielectric Loss of the polycrystalline ferrites, and point out that the chief way of lowering the Microwave Dielectric Loss of polycrys-talline ferrites, is. 漏to restrain the production of vacancies in the crystal and the entering of impurity ions of higher and lower valency into the crystal, and to prevent the occurring of high conductive phases; (2) to reduce the macroscopic or microscopic heterogeneity (e.g.pore and inclusion etc. )更多还原