Article
Materials Science, Ceramics
Lanchao Wen, Jiaxin Zhang, Li Guan, Yujie Zhu, Biao Zhao, Limeng Song, Xinkai Zhu, Rui Zhang
Summary: Transition metal carbides (TMCs) are promising materials for high temperature electromagnetic wave absorption (EWA) due to their excellent dielectric properties and thermal stability. However, the high dielectric constant and electrical conductivity of TMCs often result in impedance mismatch and their high density limits practical applications. To overcome these issues, lightweight and impedance matching NbC nanowires (NbCnws) were prepared using bamboo powder as a carbon source. The NbCnws exhibited low density and superior EMA performance, with a minimum reflection loss of -43.03 dB at 5.92 GHz and a matching thickness of only 3.7 mm at a sintering temperature of 1500 degrees C. The excellent EWA performance was attributed to good impedance matching and dielectric loss. This research provides a prospect for the development and utilization of one-dimensional TMC materials in the field of microwave absorption materials.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Hui Gao, Fa Luo
Summary: In this study, SiC interphase was prepared using a precursor infiltration-pyrolysis process. The effects of dipping concentrations on the mechanical, high-temperature dielectric, and microwave absorption properties of SiCf/SiC/Mu composites were investigated. It was found that the SiC interphase prepared with 5 wt% PCS/xylene solution had a smooth and homogeneous morphology and greatly improved the mechanical properties of the composite. The SiCf/SiC/Mu composites also showed enhanced dielectric properties and microwave absorption at high temperatures.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Feng Shi, En-Cai Xiao
Summary: Single phase LiZnPO4 (LZP) microwave dielectric ceramics were synthesized at different temperatures via a conventional solid-state ceramic route. The sintering behavior, crystal structures, phonon characteristics, and dielectric properties were studied in detail, revealing a significant influence of sintering temperature on the properties of LZP ceramics.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Materials Science, Ceramics
Lu Gao, Ruiduan Zhang, Cuoke Wei, Yichao Yin, Hang Zhang
Summary: The research focused on the dielectric and microwave absorption properties of La0.5Sr0.5CoO3 ceramics at different temperatures, aiming to develop a microwave absorbing material that can be used at 500 degrees C. It was found that the characteristics of the La0.5Sr0.5CoO3 powder remained stable even after sintering, and the La0.5Sr0.5CoO3/Al2O3 ceramic showed good microwave absorption properties in Ku band at 500 degrees C. Additionally, frequency selective surfaces (FSS) were designed to enhance the microwave absorption performance of the La0.5Sr0.5CoO3/Al2O3 ceramic in X band.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Xi Wang, Shicheng Zhou, Kaiyang Liu, Shan Deng, Yaqi Xiao, Xiuli Chen, Huanfu Zhou
Summary: Extensive research has been conducted on microwave dielectric materials for their application in 5G and 6G communication technologies. This study broadened the sintering temperature range of MT-C ceramics using a composite of CeO2 and Mg2TiO4 ceramics, and stabilized their microwave dielectric performance. The prepared MT-C ceramics exhibited low loss and uniform density, making them suitable for industrial applications in the field of communication.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Ruyi Han, Huimin Cao, Bo Li
Summary: The addition of H3BO3 to Ca2V2O7 ceramics significantly affects the microstructure, sintering mechanism, and microwave dielectric properties, resulting in reduced sintering temperature and improved performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Fang -Fang Wu, Di Zhou, Song Xia, Ling Zhang, Feng Qiao, Li-Xia Pang, Shi-Kuan Sun, Tao Zhou, Charanjeet Singh, Antonio Sergio Bezerra Sombra, Moustafa Adel Darwish, Ian M. Reaney
Summary: Low sintering temperature BVFWx ceramics prepared by solid-state reaction exhibit promising microwave dielectric properties and are suitable for low-temperature cofired ceramic technology and microwave device applications.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
Meikang Han, Yury Gogotsi
Summary: The rapid development of communication and electronic technologies has generated new demands for electromagnetic radiation protection. MXenes, a type of two-dimensional transition metal carbides and nitrides, have quickly reshaped the field since their introduction in 2016. This article provides a perspective on the recent progress and challenges of MXenes in electromagnetic jamming protection, specifically electromagnetic interference shielding and microwave absorption. It discusses the intrinsic properties and design strategies of MXenes for optimizing their performance in electromagnetic protection, aiming to clarify misconceptions and objectively assess reported materials. Finally, it examines the future opportunities and challenges in the development of MXenes for electromagnetic radiation protection.
Article
Materials Science, Ceramics
Minghu Wei, Zhonghua Fan, Jiamao Li, Dong Xu
Summary: The study demonstrated that codoping with B2O3 and CuO as sintering aids can significantly reduce the sintering temperature of 6NZCT-4NNT ceramics, with minimal impact on the phase purity of the ceramics, but noticeable effects on the surface morphology and grain size.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Wentao Hao, Panpan Xu, Li Sun, Ensi Cao
Summary: CuO addition reduces the sintering temperature of TiO2 ceramics and potentially enhances the formation of Ti3+ ions to optimize their giant dielectric properties. However, excessive Cu+ ions inhibit the formation of Ti3+ ions leading to the disappearance of giant dielectric properties. Annealing increases the concentration of Ti3+ ions in the ceramics and restores their giant dielectric properties.
CERAMICS INTERNATIONAL
(2023)
Review
Materials Science, Ceramics
P. Harshapriya, Deepak Basandrai
Summary: Bismuth titanate (BTO) and its composites are considered as prominent candidates for microwave absorption applications due to their high dielectric constant and losses. Doping with V, La, Sm, and Nd can enhance the ferroelectric and dielectric characteristics of BTO, while V-doped BTO exhibits the highest dielectric loss suitable for high temperature applications.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Wei Luo, Mengya Wang, Kangjing Wang, Peng Yan, Jilong Huang, Jie Gao, Tao Zhao, Qi Ding, Pengpeng Qiu, Haifeng Wang, Ping Lu, Yuchi Fan, Wan Jiang
Summary: By utilizing an ultralow temperature sintering strategy, a hierachical aluminosilicate glass composite with highly oriented MXene has been successfully fabricated, exhibiting excellent electromagnetic properties and mechanical performance.
Article
Materials Science, Ceramics
Qian Zhou, Heqiang Liu, Yue Gu, Wenyan Duan, Xingmin Liu, Fang Ye, Xiaomeng Fan, Lifei Du
Summary: The permittivity of PyC/Al2O3 ceramics was effectively controlled by designing micro-channels with different orientations and sizes using 3D printing. The absorption bandwidth was expanded, achieving over 90% EM wave absorption in the frequency range of 6-18 GHz.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Chemistry, Physical
Taishi Ano, Shuntaro Tsubaki, Satoshi Fujii, Yuji Wada
Summary: Microwave heating promoted by supported platinum nanoparticles on metal oxide substrates is influenced by the transparency of the substrate, with low relative permittivities and conductivities leading to considerable heating. The size and loading of the platinum nanoparticles, as well as the conductivity of the supported metal and the frequency of the microwaves, all play significant roles in the effectiveness of microwave heating. The synergy between metal nanoparticles and metal oxide support results in targeted microwave heating of the supported metal catalyst.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Zhigang Mu, Guoke Wei, Hang Zhang, Lu Gao, Yue Zhao, Shaolong Tang, Guangbin Ji
Summary: LaMnO3 perovskite has great potential in microwave absorption at high temperature due to its complex doping effect and super stability. The temperature dependence of Mn ion spin state has a significant impact on the high temperature dielectric behavior. The introduction of magnetic loss in a cellular array structure can further improve the operating temperature of LaMnO3.