Article
Engineering, Electrical & Electronic
Ke Sha, Feng Li Lin, Bing Liu, Kai Xin Song, Jia Heng Zhang
Summary: Dense (Sr1-xCax)(2)(Ti1-xSnx)O-4 ceramics were synthesized and their microwave dielectric properties were studied. The dielectric constant was mainly influenced by the ionic polarizability, while the Qf value was associated with the amount of Sr3Ti2O7 secondary phase and lattice energy. The tau(f) value could be adjusted towards zero by enhancing the bond energy. The optimal microwave dielectric properties were achieved at x = 0.10.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Materials Science, Ceramics
Yuan-Bin Chen, Yu Fan
Summary: The crystallization, microstructure analysis, and sintering behavior, microwave properties of (Mg0.95Co0.05)(2)(Ti1-xSnx)O-4 ceramics were studied. X-ray diffraction and X-ray spectroscopy analyses showed that the crystal structure of these samples was spinel-type. The microstructure with the substitution amount of Sn4+ and the dielectric performances of the ceramic were explored. A maximum Qxf value of 330,000 (GHz), εr of 14.75, and τf of -47.5 ppm/degrees C were achieved for samples sintered at 1350 degrees C for 4 h. The (Mg0.95Co0.05)(2)(Ti0.97Sn0.03)O-4 material system shows high potential for applications in high frequency-selection components.
JOURNAL OF THE AUSTRALIAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Shucheng Liu, Hao Li, Rui Xiang, Pengcheng Zhang, Xiaoqing Chen, Quanzhang Wen, Houlin Hu
Summary: In this study, Mg2Ti1-xAl4/3xO4 ceramics were synthesized through conventional solid-state ceramic route, and their cubic spinel structure, microstructure, and microwave properties were investigated. The permittivity variation was found to be related to ionic polarizability, and the value of tau(f) was influenced by bond valence. Analysis of infrared spectra and Raman spectra revealed the intrinsic properties of the ceramics, with the Mg2Ti1-xAl4/3xO4 ceramic sintered at 1420 degrees C for 4 h exhibiting optimal dielectric properties when x = 0.09.
CERAMICS INTERNATIONAL
(2021)
Article
Multidisciplinary Sciences
Asad Ali, Sarir Uddin, Madan Lal, Abid Zaman, Zafar Iqbal, Khaled Althubeiti
Summary: Sn-doped BaTi4O9 (BT4) dielectric ceramics were prepared using a mixed oxide route, showing orthorhombic symmetry in XRD analysis. SEM revealed that grain size decreased with increased Sn4+ content. FTIR spectroscopy confirmed the presence of metal oxide groups, while photoluminescence spectra showed red color emission. Microwave dielectric properties of the ceramics exhibited high dielectric constant, quality factor, and low dielectric loss.
SCIENTIFIC REPORTS
(2021)
Article
Materials Science, Multidisciplinary
Cheng-Liang Huang, Pei-En Chiang, Tsung-Hsien Hsu
Summary: The study investigated the effect of minutely substituting Sr with Mg on the structure, sintering temperature, densification and microstructure of the (Sr1-xMgx)V2O6 ceramic, as well as the influence of intrinsic and extrinsic factors on its microwave dielectric properties. Among the compositions studied, (Sr0.93Mg0.07)V2O6 sintered at 620 degrees C showed promising microwave dielectric properties and excellent chemical compatibility with Al electrodes.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Tsung-Hsien Hsu, Cheng-Liang Huang
Summary: Li(2(1-x))M( )xWO(4) (M = Mg, Zn; x = 0.01-0.09) ceramics with an ultra-low sintering temperature of 540 °C were prepared by solid-state synthesis. The sintering temperature of Li2WO4 dielectric could be reduced to 540 °C by replacing Li with 0.05 mol% Mg or 0.07 mol% Zn. The ceramics exhibited excellent dielectric properties with epsilon(r) of 6.2 and 5.8, Q x f of 76,000 and 68,000 GHz, and tau(f) of -94 and -86 ppm/°C, respectively. The Li(2(1-x))M( )xWO(4) ceramic is a glass-free, phase pure, and energy-saving dielectric ideal for ULTCC applications.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)
Article
Materials Science, Ceramics
Tsung-Hsien Hsu, Cheng-Liang Huang
Summary: Substituting a small amount of Mg or Zn in place of Li greatly enhances the microwave dielectric properties of LiVO3. Additionally, the addition of 2% TiO2 improves the characteristics of the Li0.98Mg0.01VO3 specimen, making it a very promising ULTCC dielectric for high-frequency 5G applications when sintered at 520 degrees C.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Muhammad Javid, Xinghao Qu, Yongpeng Zhao, Feirong Huang, Amjad Farid, Hao Zhang, Asif Shah, Khan Abdul Sammed, Yuping Duan, Zhidong Zhang, Lujun Pan, Xinglong Dong
Summary: The hexagonal-shaped Cr3C2 nanoplatelets coated with carbon shells (Cr3C2@C) synthesized through an arc discharge plasma process exhibit weak ferromagnetism, suitable electrical conductivity, and excellent microwave absorption properties. The intrinsic defect-rich Cr3C2 cores and amorphous carbon shells in the nanomaterials play important roles in dielectric polarization and induced magnetism. The Cr3C2@C nanoplatelets show promising reflectivity performance in paraffin matrix with 30 wt% loading, making them suitable for various applications, especially in harsh environments.
Article
Materials Science, Ceramics
Javier Mena-Garcia, Arnaud Ndayishimiye, Zhongming Fan, Steven E. Perini, Wenjie Li, Bed Poudel, Shashank Priya, Brian Foley, John Gaskins, Clive A. Randall
Summary: To meet the increasing demands for bandwidth in 5G and 6G communication technology, the development of new dielectric substrates with low dielectric loss and improved thermal conductivity is essential. This study focuses on designing composites with low dielectric loss and high thermal conductivity for microwave applications involving high power and high frequency. The fabrication process of high-density electroceramic composites using sodium molybdate as the dielectric material and hexagonal boron nitride as the filler with higher thermal conductivity is described. The physical properties of the composites were characterized and analyzed based on filler volume, temperature, and frequency.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Yau-Shiuan Li, I-Chun Ling, Tsung-Hsien Hsu, Cheng-Liang Huang
Summary: Pure and Mg-substituted AgCaVO4 compounds were synthesized and their microwave dielectric properties were studied. XRD patterns confirmed an orthorhombic crystal structure for all samples. The pure AgCaVO4 ceramic showed a dielectric constant of 11.7, Q x f of 15,000 GHz, and tau(f) of 38 ppm/degrees C at 530 degrees C. Mg substitution in the range of x = 0.03-0.05 reduced dielectric loss and increased the dielectric constant. AgCa0.97Mg0.03VO4 ceramic displayed optimal properties of ε(r) = 12, Q x f = 23,000 GHz, and tau(f) = -35 ppm/degrees C, making it a promising candidate for ULTCC applications.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Chemistry, Multidisciplinary
Tongtong Xu, Jun Li, Dongpeng Zhao, Xiping Chen, Guangai Sun, Zhongxiang Zhou
Summary: Microstructures have a significant impact on the polarization behavior of dielectric materials in the gigahertz frequency range. The relationship between microstructures and polarization behavior in solid-solution structures is still unclear. In this study, nano-laminated (Ti1-yNby)(2)AlC MAX phase solid solutions were used to investigate this relationship. Experimental characterizations showed that niobium atom manipulative solid-solution engineering can balance the conduction loss and polarization loss, leading to improved impedance matching and electromagnetic absorption performance. Theoretical calculations revealed that the electric dipoles were attributed to charge density differences resulting from altered atomic distribution. The Ti1.2Nb0.8AlC solid solution exhibited optimized microwave absorption performance, with a minimum reflection loss of -42 dB and an effective absorption bandwidth of 4.3 GHz at an ultra-thin thickness of 1.4 mm. This work provides insights into structural engineering for modifying electromagnetic response performance at gigahertz frequencies and can be extended to other solid-solution materials.
Article
Materials Science, Multidisciplinary
Jiyong Liang, Pengyu Lv, Ming Bai, Huiling Duan
Summary: A novel water solution based tunable microwave absorbing metamaterial (MAM) was fabricated by 3D printing method. The study investigated the influence of different water solutions and structural parameters on the absorption properties of MAMs, showing effective absorption in a specific frequency range. Tuning the water solutions and micro-channel structure parameters can achieve high absorption in X band. This study presents a feasible and novel strategy for fabricating water solution based tunable MAMs.
Article
Materials Science, Ceramics
Xian Xue, Xiaomeng Li, Changli Fu, Yan Zhang, Jing Guo, Hong Wang
Summary: A series of high-k [(Na0.5Bi0.5)xBi(1-x)](WxV1-x)O-4 solid solution ceramics with a scheelite-like structure were synthesized using a modified solid-state reaction method at temperatures ranging from 680 to 760℃. The transition from monoclinic to tetragonal scheelite structural phase was confirmed, and the impact of structural deformation and order-disorder on microwave dielectric properties was investigated. The ceramics exhibited a wide range of variable relative permittivity and temperature coefficient of resonant frequency, with high values near the phase boundary at x = 0.09. Temperature-stable dielectric ceramics with excellent properties were designed using a mixture of x = 0.07 and 0.08. The compatibility of scheelite-like solid solution systems makes them potential candidates for low-temperature co-fired ceramic (LTCC) applications.
JOURNAL OF ADVANCED CERAMICS
(2023)
Article
Nanoscience & Nanotechnology
Cameron J. Kopas, Justin Gonzales, Shengke Zhang, D. R. Queen, Brian Wagner, McDonald Robinson, James Huffman, Nathan Newman
Summary: This study demonstrates that deposited Ge and Si dielectric thin-films exhibit low microwave losses at single-photon powers and sub-Kelvin temperatures, making them suitable for a wide range of devices in microwave and Josephson junction circuit fabrication. By maximizing the sensitivity of loss tangent measurements to the interface and properties of the deposited dielectrics, rather than optimizing the quality factor, effective single-photon loss tangents were found to be significantly low in a-Ge and homoepitaxial single-crystal Si films. Interface contamination was identified as a potentially limiting factor for the losses in these materials.
Article
Engineering, Electrical & Electronic
Merih Palandoken, Cem Gocen, Taimoor Khan, Zahriladha Zakaria, Issa Elfergani, Chemseddine Zebiri, Jonathan Rodriguez, Raed A. Abd-Alhameed
Summary: In this article, a 2.45-GHz band microwave sensor (MWS) is introduced for determining the dielectric constant of ethanol-water solutions. The MWS consists of two directly coupled split-ring resonators with a circular ring-shaped detection area for the solution. The prototype of the MWS is fabricated on a Rogers RO4003 substrate with a total size of 12 x 30 mm. The MWS shows good performance in both numerical evaluation and experimental validation, offering the feasibility of identifying complex dielectric parameters and ethanol content concentration.
IEEE SENSORS JOURNAL
(2023)
Article
Materials Science, Ceramics
Zilong Xiong, Wenzhuo Xue, Mujun Li, Feihu Tan, Yupeng Chen, Hongyu Yu
Summary: In this study, CBS glass/Al2O3 composites were developed for LTCC applications based on a CaO-B2O3-SiO2 (CBS) glass system with a high boron content. The study revealed that the softening of glass and interfacial reaction between the glass and Al2O3 were the two most important factors affecting LTCC's densification process. Real-time shrinkage rate of LTCC during sintering was successfully simulated, and it was proven that the formation of the CaAl2(BO3)O phase played a significant role in reducing glass viscosity and promoting dense structure formation. The resulting LTCC composite exhibited excellent performance for high-frequency applications.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Saurabh Kumar Sharma, Vinita Grover, Rakesh Shukla, Abid Hussain, Ambuj Mishra, Pawan Kumar Kulriya
Summary: In this study, the disordering caused by swift heavy ion irradiation in two different compositions of pyrochlore structures was investigated. X-ray diffraction, Raman spectroscopy, and high-resolution transmission electron microscopy were used to analyze the samples before and after irradiation. It was found that both compositions underwent amorphization due to irradiation, with a slower rate observed in Nd1.8Zr2.2O7.1. The irradiation-induced modified track region in Nd1.8Zr2.2O7.1 consisted of defect-rich pyrochlore structure, anion-deficient fluorite structure, and amorphous domains.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Jiabei He, Mengshan Song, Ming Yang, Miaomiao Zhu
Summary: This study investigates the influence of ion irradiation on high-entropy ceramics and finds that irradiation-induced lattice rearrangement can improve the radiation resistance of these ceramics.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yajie Yu, Shi He, Zhengang Zhang, Haihua Chen, Peipeng Jin, Binnian Zhong, Linhui Zhang, Liping Wang, Cheng Lu
Summary: Silicide ceramics, including tantalum disilicide (TaSi2), are known for their exceptional physical properties but are limited in practical applications due to their inherent brittleness at room temperature. In this study, we successfully improved the mechanical properties of TaSi2 ceramics and increased their electrical conductivity by modifying the preparation methods and sintering conditions. These findings provide valuable insights for future applications of TaSi2 and the design of advanced ceramic materials.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Jian Li, Jia Liu, Yongcui Zhang, Wei Sun, Yang Wang, Haitao Wu, Ling Li, Chuanbing Cheng, Yingying Wang, Ke Tan, Futian Liu
Summary: Microstructure design plays a crucial role in regulating the microwave dielectric properties of materials, however, the understanding of frequency temperature stability and related micromechanism remains limited. In this study, a combination of first-principles calculations and experimental observation was used to investigate the correlation among sintering behavior, crystal structure, bonding nature, and microwave dielectric properties of LnPO(4) (Ln = Eu, Pr) ceramics. The research findings systematically clarify the optimized effect and micromechanism of lanthanides on the dielectric properties of monazite ceramics, providing insights into the design and enhancement of microwave dielectric materials.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Wenqian Pan, Xizhen Xia, Wei Zhou, Yang Li
Summary: The study investigates the frictional and wear behaviors of carbon fiber-reinforced SiC ceramic matrix composites with different fiber orientations mating with ceramic balls. The results show that fiber orientation significantly affects the friction and wear properties of the composites. Pads with randomly arranged fibers demonstrate better friction stability and lower wear volume, potentially suitable for bearing material applications. The research also explores the factors influencing the formation of continuous tribo-film and identifies abrasive wear and oxidation wear as the dominant wear mechanisms for the friction pairs.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Sergey Nikolaevich Perevislov, Ilya Evgenievich Arlashkin, Valentina Leonidovna Stolyarova
Summary: This paper describes the synthesis and sintering of MAX phases in the Zr-Al-C system. Different mixtures of initial Zr/Al/C and Zr/Al/ZrC powders were used to synthesize Zr2AlC and Zr3AlC2 MAX phases. The highest content of Zr3AlC2 MAX phase was obtained using a component ratio of 1:1.5:2-51.1 vol.% of Zr/Al/ZrC powders.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Weijia Luo, Xubin Wang, Baiheng Bai, Jianli Qiao, Xingcong Chen, Yongzheng Wen, Jingbo Sun, Lingxia Li, Ji Zhou
Summary: This study successfully establishes the relationship between internal strain and dielectric loss by synthesizing and designing specific structure of tungsten bronze ceramics, and concludes that controlling internal strain can effectively reduce dielectric loss. This research is of great significance for the development of future all-ceramic non-Hermitian devices.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Santanu Mondal, Juan Diego Shiraishi Lombard, Sreenivasulu Gollapudi, Carolina Tallon, Jie-Fang Li, Dwight Viehland
Summary: Ultrafast high-temperature sintering (UHS) is an effective method for rapidly densifying ZrB2 powders. The final grain size increases with longer sintering duration. X-ray diffraction and energy-dispersive spectroscopy show crystalline phase and compositional uniformity in ZrB2 after UHS.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
JiaNan Wang, ZhiQiang Li, YongZheng Zhu, Yao Liang, Yan Cui, HuaLong Tao, Bo Song, Alexander Nikiforov, ZhiHua Zhang
Summary: First-principles calculations were performed to investigate the crystal structure, electronic structure, and ion diffusion of sulfur-doped Li2FeSiO4. The results showed that sulfur doping can improve the electronic conductivity and reduce the energy barrier for ion diffusion.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Xiaodi Dai, Serdar Aydin, Mert Yuecel Yardimci, Gunter Reekmans, Peter Adriaensens, Geert De Schutter
Summary: This study investigates the rheological behavior, solidification process, and nanostructure changes of sodium hydroxide-activated slag (NH-AAS) and sodium silicate-activated slag (SS-AAS) pastes over time. The results show that NH-AAS and SS-AAS release similar heat and reach a similar reaction degree at their initial setting times, but have different gel structures.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yanliang Ji, Simon Becker, Zichen Lu, Alexander Mezhov, Regine von Klitzing, Schmidt Wolfram, Dietmar Stephan
Summary: This study reveals the significant influence of resting time on the rheological properties of cement suspensions, which is closely related to non-absorbed polycarboxylate superplasticizers (PCEs) size variation. Adsorbed PCE during resting tends to bridge particles instead of dispersing them, leading to an increased yield stress.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yifeng Huang, Xin Wang, Yinchang Ma, Xiang Lv, Jiagang Wu
Summary: This study investigates the effect of K/Na ratio on the phase structure, ferroelectric domains, and piezoelectric properties of potassium sodium niobate (KNN)-based ceramics. It reveals that high Na+ content leads to large ferroelectric domains, while high K+ content results in local polarity heterogeneity and distinct dielectric relaxational behavior. The balanced local polarity and stress heterogeneities contribute to improved piezoelectricity.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Zun Xia, Yedong Rong, Hao Li, Ye Dong, Hongbo Yu, Jie Xu, Xiuhui Wang, Jinlong Yang
Summary: This study presents the synthesis of hollow MgAl2O4 particles in situ within porous ceramics, resulting in volume expansion and the formation of a hierarchical pore structure, leading to a significant improvement in compressive strength.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Honglong Wang, Zhiguo Sun, Faming Xia, Chenguang Yang, Xiaoguang Wang, Jintang Li, Linxu Jiang
Summary: In this study, the micro-geometry morphology variation and microstructural transformation mechanism of muscovite crystals under electron beam irradiation were explored. The results revealed the instability of the muscovite lattice under irradiation, as well as the expansion and shrinkage of the lattice with increasing dose. The study also identified changes in chemical structure and other mechanisms involved. These findings are significant for the design of radiation-resistant silicate materials and the manufacturing of electronic components used in the aerospace industry.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)