Z.F. Gu, Z.C. Yu, B. Hong, J.C. Xu, Y.B. Han, X.L. Peng, H.L. Ge, X.Q. Wang
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引用次数: 1
摘要
由于特殊的平面结构和极高的电阻率,[公式:见文]型六铁氧体具有较高的初始磁导率和截止频率,在高频器件中具有很大的应用潜力。采用溶胶-凝胶法成功制备了锶co2z六铁体(Sr 3 Co 2 Fe[公式:见文]O[公式:见文]),并在1175[公式:见文]C至1250[公式:见文]C的不同温度下进行了煅烧。研究了煅烧温度对样品微观结构、相结构、磁性能和微波吸收性能的影响。结果表明,锶六铁体从1175[公式:见文]C到1250[公式:见文]C,经历了[公式:见文]-、[公式:见文]-、[公式:见文]-、[公式:见文]-相变过程,确认S-1200(1200℃煅烧[公式:见文]C)为Co 2 z型六铁体。S-1200的虚磁导率最高,而所有样品的虚介电常数均接近于零,表明六铁体对锶co2z具有优异的微波吸附性能。根据阻抗匹配和四分之一波长理论,反射损耗结果表明,S-1200在4.72 GHz时表现出最佳的微波吸收性能,在4.0 mm厚度下的RL值为−32.4 dB。
Sol-gel synthesis, electromagnetic properties and microwave absorption behavior of strontium Co2Z hexaferrites
Owing to the special planar structure and very high resistivity, [Formula: see text]-type hexaferrites possess the high initial permeability and cut-off frequency, indicating great application potential in high-frequency devices. Strontium Co 2 Z hexaferrites (Sr 3 Co 2 Fe[Formula: see text]O[Formula: see text]) were successfully prepared by the sol–gel method and calcined at the different temperatures from 1175[Formula: see text]C to 1250[Formula: see text]C. The influence of the calcined temperatures on the microstructure, phase structures, magnetic properties and microwave absorption behavior of all samples was investigated in detail. All results indicated that strontium hexaferrites go through the [Formula: see text]-, [Formula: see text]-, [Formula: see text]-, and [Formula: see text]-phase transformation process from 1175[Formula: see text]C to 1250[Formula: see text]C, and S-1200 (calcined at 1200[Formula: see text]C) is confirmed to be Co 2 Z-type hexaferrites. S-1200 showed the highest imaginary permeability while the imaginary permittivity of all samples is close to zero, indicating the excellent microwave adsorption behavior of strontium Co 2 Z hexaferrites. The reflection loss results indicate that S-1200 exhibits the best microwave absorption performance with the RL value of − 32.4 dB for 4.0 mm thickness at 4.72 GHz, according to the impedance matching and quarter-wavelength theory.
期刊介绍:
Functional Materials Letters is an international peer-reviewed scientific journal for original contributions to research on the synthesis, behavior and characterization of functional materials. The journal seeks to provide a rapid forum for the communication of novel research of high quality and with an interdisciplinary flavor. The journal is an ideal forum for communication amongst materials scientists and engineers, chemists and chemical engineers, and physicists in the dynamic fields associated with functional materials.
Functional materials are designed to make use of their natural or engineered functionalities to respond to changes in electrical and magnetic fields, physical and chemical environment, etc. These design considerations are fundamentally different to those relevant for structural materials and are the focus of this journal. Functional materials play an increasingly important role in the development of the field of materials science and engineering.
The scope of the journal covers theoretical and experimental studies of functional materials, characterization and new applications-related research on functional materials in macro-, micro- and nano-scale science and engineering. Among the topics covered are ferroelectric, multiferroic, ferromagnetic, magneto-optical, optoelectric, thermoelectric, energy conversion and energy storage, sustainable energy and shape memory materials.