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首页> 外文期刊>Physica, B. Condensed Matter >The microwave electromagnetic characteristics of manganese dioxide with different crystallographic structures
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The microwave electromagnetic characteristics of manganese dioxide with different crystallographic structures

机译：不同晶体结构的二氧化锰的微波电磁特性

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摘要

MnO2 with different morphologies and crystal structures were prepared via a low-temperature hydrothermal method in a stainless-steel autoclave at 120 degrees C at different dwell times. The products were characterized by powder X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electromagnetic and microwave-absorption properties of the as-obtained MnO2 were reported. The results show that the different dwell times play a crucial role in the phase purity, the crystal structure, the morphology, and the electromagnetic properties of the products. The real and imaginary parts of the complex permittivity of the as-prepared MnO2 increased systematically with increasing dwell times, while the complex magnetic permeability values showed the contrary. The absorbing peak value of the reflection loss of the MnO2/paraffin wax visibly shifted to the lower frequency band with the increase in the reaction times of the MnO2 products. The microwave absorption properties of the MnO2 products were mainly attributed to both the dielectric and magnetic losses. In the total loss, however, the dielectric loss played the more important role, especially in the dielectric polarization loss versus frequency test.
机译：通过低温水热法在不锈钢高压釜中于120摄氏度，不同的停留时间制备出具有不同形态和晶体结构的MnO2。通过粉末X射线衍射（XRD）和扫描电子显微镜（SEM）表征产物。报道了所获得的MnO2的电磁和微波吸收特性。结果表明，不同的停留时间对产品的相纯度，晶体结构，形态和电磁性能起着至关重要的作用。所制备的MnO2的复介电常数的实部和虚部随停留时间的增加而系统地增加，而复磁导率值却相反。随着MnO 2产物反应时间的增加，MnO 2 /石蜡的反射损失的吸收峰值明显移至较低频带。 MnO2产品的微波吸收特性主要归因于介电损耗和磁损耗。然而，在总损耗中，介电损耗起着更重要的作用，尤其是在介电极化损耗与频率测试中。

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