Millimeter-wave absorption properties of BaTiO3/Co3O4 composite powders controlled by high-frequency resonances of permittivity and permeability
Millimeter-wave absorption properties of BaTiO3/Co3O4 composite powders controlled by high-frequency resonances of permittivity and permeability
复制标题
BaTiO3/Co3O4复合粉末的毫米波吸收特性受介电常数和磁导率高频共振控制
DOI：
10.1039/c8tc04776f
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发表时间：
2018-12
影响因子：
6.4
通讯作者：
Du Piyi
中科院分区：
文献类型：
--
作者：
Tian Wei;Ma Ruoyang;Gu Jian;Wang Zongrong;Ma Ning;Du Piyi
发展高效的毫米波吸波材料，对于减少信息技术的快速发展带来的电磁污染，防御军事隐身技术的雷达探测具有重要意义。本研究采用溶胶-凝胶法成功制备了具有分层结构的BaTiO(BTO)/Co3O4毫米波吸收复合粉末。结果表明，当BTO/Co摩尔比接近1，烧结温度在900℃左右时，Co3O4相优先形成，而BTO在1000~1100℃的高温下优先形成BTO；当BTO/Co的摩尔比接近1，烧结温度在900℃左右时，复合材料的介电常数和磁导率出现典型的共振现象，Er和μr值较接近，在30~40 GHz的高频范围内，e‘和μ’‘较高。在BTO/Co摩尔比为4/6的复合材料中，在90 0℃烧结时，产生了具有合适频差的双吸收峰，获得了−4 0~−5 0d B的吸收强度和5 GHz的带宽，样品匹配厚度在35 GHz附近为1.8 mm。它完全覆盖了35 GHz的大气层窗口，这是毫米波透明度最强的地方。该复合材料可作为一种高效的毫米波吸收材料。
Development of high-efficiency millimeter-wave-absorbing materials is important to attenuate electromagnetic pollution occurring due to rapid development of information technology and to defend against radar detection for military stealth technology. In this study, BaTiO3 (BTO)/Co3O4 millimeter-wave absorption composite powders with hierarchical microstructures were successfully prepared by the sol–gel method. The results indicated that the Co3O4 phase was preferentially formed at low temperature of 800–900 °C and BTO was formed at high temperature of 1000–1100 °C. A composite with perfect crystallization of both constituent phases and uniform microstructure was obtained when its molar ratio of BTO/Co approached 1 and the sintering temperature was around 900 °C. Both permittivity and permeability resonances were generated typically in composites, due to which er and μr values were relatively closer and e′′ and μ′′ were high at high-frequency range of 30–40 GHz. In the composite with molar ratio of BTO/Co of 4/6 sintered at 900 °C, double absorption peaks with appropriate frequency difference were generated, and absorption intensity from −40 to −50 dB and bandwidth of 5 GHz were successfully obtained with sample matching thickness of 1.8 mm around 35 GHz. It completely covered the atmosphere window at 35 GHz, which has the strongest transparency of millimeter wave. This composite can be used as a highly efficient absorption material of millimeter-wave rays.
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影响因子：
5.2
作者：
Y. Zhou;T. Lei;Y. Lu
通讯作者：
Y. Zhou;T. Lei;Y. Lu
影响因子：
2.7
作者：
R. Bacsa;P. Ravindranathan;J. Dougherty
通讯作者：
R. Bacsa;P. Ravindranathan;J. Dougherty
影响因子：
9.5
作者：
Zhang, Yang;Qiu, Munan;Cheng, Lele
通讯作者：
Cheng, Lele
影响因子：
3.5
作者：
Dong-Geun Lee;Cheng-Lin Li;Yongtai Lee;X. Mi;Ye Wenjun
通讯作者：
Dong-Geun Lee;Cheng-Lin Li;Yongtai Lee;X. Mi;Ye Wenjun
影响因子：
3.9
作者：
Xiang‐qian Shen;Fu-zhan Song;Jun Xiang;Mingquan Liu;Y. Zhu;Yingde Wang
通讯作者：
Xiang‐qian Shen;Fu-zhan Song;Jun Xiang;Mingquan Liu;Y. Zhu;Yingde Wang