Article
Materials Science, Ceramics
Jiaojiao Du, Wenjie Dai, Haijiang Kou, Pengfei Wu, Weiliang Xing, Yuzhuo Zhang, Chao Zhang
Summary: In this paper, AlN coatings were deposited on Cu substrates for the first time to maintain high thermal conductivity and obtain excellent electrical properties. By adjusting the duty cycles, the microstructure, thermal conductivity, and electrical properties of the AlN/Cu systems were controlled. The AlN/Cu systems improved the thermal conductivity of Cu and exhibited high resistivity and low dielectric loss. The minimum dielectric constant of the coating at 2000 kHz frequency was 5.6. These systems meet the requirements for high-power integrated circuit packaging.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Rayko Simura, Kyosuke Sawamura, Hisanori Yamane
Summary: Single crystals of Ba4Zn2Al2O9 were obtained by heating a mixture of BaCO3, ZnO, and Al2O3 at 1413 K in a dry air atmosphere. The crystalline structure is characterized by a substitution of Zn/AlO4 tetrahedra for B-cation-centered O octahedra and occupied by Ba atoms. The physical properties like melting temperature, electrical conductivity, relative permittivity, and thermal expansion coefficient were measured for a polycrystalline bulk sample.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Materials Science, Ceramics
Steven M. Smith, Lun Feng, William G. Fahrenholtz, Gregory E. Hilmas, Laura Silvestroni
Summary: The thermal and electrical properties of TiB2 ceramics were significantly affected by the addition of varying amounts of CrB2, showing a decrease in thermal diffusivity, an increase in anisotropy in thermal expansion coefficients, and a decrease in electrical conductivity with increasing Cr content.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Physics, Condensed Matter
Tekeste Dankala, K. Vijaya Babu, Paulos Taddesse
Summary: A series of Ce-doped Li0.5+xLa0.5-xCe2xTi1-xO3 crystalline oxides were synthesized by a solid-state reaction. The effects of Ce-doping on the thermal, structural, electrical, and dielectric properties of Li0.5La0.5TiO3 were investigated. The results showed that the incorporation of Ce ions improved the electrical conductivity of Li0.5La0.5TiO3.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Materials Science, Multidisciplinary
Sora-at Tanusilp, Masaya Kumagai, Yuji Ohishi, Hideki Furusawa, Motoomi Suwabe, Ken Kurosaki
Summary: In this study, a highly dense bulk sample of ZrW2O8 was synthesized using spark plasma sintering technique, and its thermal conductivity, mechanical properties, and other physical properties were investigated. It was found that ZrW2O8 exhibited unique thermal properties and could be potentially used in thermal management areas.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
M. Naseem Siddique, P. Tripathi
Summary: Ni1-xLaxO (x = 0.00, 0.01, and 0.03) nanostructures were synthesized using the sol-gel method, and their electrical conduction and thermal stability were investigated. The presence of oxygen vacancies resulted in high dielectric constant and dielectric relaxation behavior at high temperatures.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Polymer Science
Stepan V. V. Lomov, Iskander S. S. Akmanov, Qiang Liu, Qi Wu, Sergey G. G. Abaimov
Summary: The temperature dependence of the electrical conductivity/resistivity of CNT networks is observed to be negative, especially for aligned CNTs (A-CNTs). This study investigates the role of three phenomena, namely the temperature dependence of the intrinsic conductivity of CNTs, the tunnelling resistance of their contacts, and thermal expansion of the network, on the temperature coefficient of resistance (TCR). The results show that the TCR of the CNTs themselves is the main factor influencing the TCR of the film, while the TCR of the tunnelling contacts and film thermal expansion have marginal effects.
Article
Materials Science, Composites
Xiaotao Zhu, Zeming Fang, Ying Yi, Zeru Wang, Yeqiao Meng, Qianfa Liu, Ke Wang
Summary: This study successfully reduced the coefficient of thermal expansion (CTE) and improved the dielectric properties of polymer composites by incorporating Zr2WP2O12 (ZWP) particles. The performance of the PPO/ZWP composites was superior to that of traditional PPO/silica composites. Therefore, PPO/ZWP composites may be promising materials for high-frequency applications in electronic packaging fields.
POLYMER COMPOSITES
(2023)
Article
Materials Science, Multidisciplinary
Zhendong Shi, Jie Sheng, Zhaoyuan Liu, Ziyue Yang, Changsheng Xing, Jie Li, Wanxiaonan Chen, Miao Wang, Lidong Wang, Weidong Fei
Summary: In this study, high-strength, high-conductivity, and low-thermal expansion GNS/Cu composites were successfully prepared by pyrolysis and spark plasma sintering. The introduction of trimesic acid improved the volume fraction and order degree of carbon in the composites, resulting in excellent combined performance. This work offers an effective solution for the design of GNS/Cu composites with superior properties.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Ceramics
Kang Du, Mengdie Zhou, Zheyu Liu, Tailai Wen, Changzhi Yin, Yiyang Cai, Xiaoxiao Li, Wei Zhu, Jianyong Guo, Shengxiang Wang, Wen Lei
Summary: This paper presents the fabrication procedure, crystal structure, microstructure, microwave dielectric properties and temperature coefficient of thermal expansion of BaMg2Al6Si9O30-based ceramics. The BaMg2Al6Si9O30 ceramics exhibit unique thermal expansion behavior due to the strong Si/Al-O bonds and 2-coordinate oxygen atoms that allow longitudinal vibrations.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Xia Fang, Senchuan Jiang, Limei Pan, Shuang Yin, Tai Qiu, Jian Yang, Xiaoyun Li
Summary: In this study, beta-SiC is used as an attenuating agent in beta-SiC/AlN microwave attenuating composites and found to slow AlN grain growth and generate SiC-AlN solid solution during sintering, resulting in enhanced electrical and dielectric properties. Adjusting the content of beta-SiC significantly improves the microwave absorption performance of the composites, with absorption performance being tunable for samples with 25-40 vol% beta-SiC content in terms of optimal absorption frequency and thickness.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Review
Polymer Science
Jialong Li, Xiaoxu Liu, Yu Feng, Jinghua Yin
Summary: Since the discovery of graphene in 2004, research on 2D nanosheets embedded in polymer composites has grown rapidly. This article summarizes the preparation of various 2D nanosheets and discusses their effects on the performance of polymer nanocomposites. The relationships between the structure of 2D nanosheets and the properties of polymer composites are also explored, and the structural design of polymer composites is evaluated. Finally, the article discusses the future prospects and challenges.
PROGRESS IN POLYMER SCIENCE
(2022)
Article
Materials Science, Ceramics
Guohua Fan, Ting Feng, Yunpeng Qu, Chuncheng Hao, Yao Liu
Summary: In this study, carbon nanotubes/TiN/CaCu3Ti4O12 ternary composites were prepared, and the effects of dual fillers on the dielectric properties of the composites were investigated. The composites exhibited a capacitive-inductive transition and negative permittivity, which was regulated by changing the filler content or adjusting the microstructure. The conduction loss dominated the dielectric loss mechanism of the composites. The clarification of the realization and regulation mechanism of negative permittivity provides insights for the preparation and development of negative permittivity materials.
CERAMICS INTERNATIONAL
(2022)
Review
Polymer Science
Rashid Dallaev, Tatiana Pisarenko, Nikola Papez, Petr Sadovsky, Vladimir Holcman
Summary: This paper offers a brief overview of epoxy resins, discussing their characteristics, variants, chemical modifications, curing processes, and electrical properties. It highlights the crucial role of epoxy resins in electrical insulation, explores strategies to enhance dielectric strength, and investigates the impact of fillers and additives on insulation performance.
Article
Materials Science, Multidisciplinary
Kusse Kubaya, Paulos Taddesse
Summary: In this study, LiNiPO4, LiNi0.8Mn0.2PO4, and LiNi0.8Mn0.1Fe0.1PO4 cathodes were prepared via solid-state reaction technique and characterized by XRD and FTIR analysis. It was found that doping with Mn2+ ions alone was more effective in enhancing the electrical conductivity and electrochemical performance of the cathode compared to co-doping with Mn2+ and Fe2+ ions.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)