Dy³⁺掺杂CaMnO₃材料的微波吸收性能研究

Study on Microwave Absorption Properties of CaMnO₃ Samples Doped with Dy³⁺ Ions

摘要: 文章主要研究了不等价Dy³⁺离子掺杂的Ca_1-xDy_xMnO₃样品的微波吸收性能。利用固相反应法制备不同Dy³⁺浓度掺杂的Ca_1−xDy_xMnO₃ (x = 0%, 2%, 5%, 8%, 10%)样品，分析Dy³⁺离子掺杂对Ca_1−xDy_xMnO₃样品在晶体结构、微观形貌、电磁参数以及吸波性能等方面的影响。实验结果表明，随着Dy³⁺离子掺杂浓度的提高，样品颗粒尺寸减小，介电常数实部增大，吸波性能得到增强。当Dy³⁺离子掺杂浓度为5%时，样品吸波性能最佳，在频率2~18 GHz范围内，最大有效吸波带宽达到2.2 GHz，最小反射损耗可达−39.72 dB。文章利用不等价Dy³⁺离子掺杂有效提高吸波性能，拓宽了CaMnO₃材料在微波吸收领域的潜在应用。

Abstract: This paper mainly studies the microwave absorption properties of Ca_1−xDy_xMnO₃ samples doped with non-equivalent Dy³⁺ ions. Samples of Ca_1−xDy_xMnO₃ (x = 0%, 2%, 5%, 8%, 10%) doped with various concentrations of Dy³⁺ ions were prepared using the solid-state reaction method. The effects of Dy³⁺ ion doping on the crystal structure, micromorphology, electromagnetic parameters, and microwave absorption properties of the Ca_1−xDy_xMnO₃ samples were analyzed. The experimental results indicate that as the doping concentration of Dy³⁺ ions increases, the particle size of the samples decreases, the real part of the permittivity increases, and the microwave absorption properties are enhanced. When the doping concentration of Dy³⁺ ions is 5%, the samples exhibit the best microwave absorption performance, with a maximum effective absorption bandwidth of 2.2 GHz and a minimum reflection loss of −39.72 dB within the frequency range of 2~18 GHz. This paper effectively improves microwave absorption performance through the doping of non-equivalent Dy³⁺ ions, broadening the potential applications of CaMnO₃ materials in the field of microwave absorption.