Article
Crystallography
Haoxuan Guo, Peishu Zhu, Qingping Lin, Min Gao, Deping Tang, Xinghua Zheng
Summary: The sintering characteristics, phase evolutions, microstructures, and microwave dielectric properties of BaTi4O9 ceramics with CuO-TiO2 (CT) additions were investigated. The addition of 0.5 wt% CT significantly reduced the sintering temperature of BaTi4O9 ceramics from 1350°C to about 1100°C. However, increasing the CT content beyond 0.5 wt% did not further lower the sintering temperature. Secondary phases of Ba4Ti13O30, BaTiO3, and TiO2 were observed when the CT content exceeded 2 wt%. The introduction of 0.5 wt% CT in BaTi4O9 ceramics sintered at 1100°C resulted in excellent microwave dielectric properties, such as epsilon = 36.9, Q x f = 23100 GHz, and tau(f) = 2.5 ppm/°C. The densification mechanism and variations of microwave dielectric properties were discussed in relation to crystal phase and microstructure evolution.
Article
Materials Science, Ceramics
Yangyang Liu, Maosen Fu, Hanju Guo, Xiao Ma, Lei Ni
Summary: Nd[(Mg1-xZnx)(1/2)Ti-1/2]O-3 perovskite ceramics with different Zn2+ substitution ratios were prepared and the effects on their structure, microstructure, and microwave dielectric properties were investigated. The results showed that Zn2+ substitution affected the degree of 1:1 cation ordering in the ceramics, with an optimal substitution ratio. Similarly, the microwave dielectric properties varied with the degree of 1:1 cation ordering.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Yangyang Liu, Maosen Fu, Xiao Ma, Jiaming He, Lei Ni
Summary: The grain size, B-site 1:1 cation ordering, chemical defects, and microwave dielectric properties of non-stoichiometric Nd(Zn1/2Ti1/2+x)O3+2x ceramics were tuned by self-doping methods. Ti4+ self-doping increased the grain size and affected the degree of B-site 1:1 cation ordering. Non-stoichiometry modulated the effective radius difference and charge difference of B-site ions, which influenced cation ordering. The non-stoichiometric samples exhibited higher Q x f value compared to traditional stoichiometric samples.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Electrical & Electronic
Yun Zhang, Xi Jiang, Shihua Ding, Tianxiu Song
Summary: Temperature stable microwave dielectric ceramics CoZrNb2O8-xCaTiO(3) were fabricated by a solid-state technique, exploring the relationship between structure and properties. Proper addition of CaTiO3 reduced the sintering temperature, while excessive amount caused lattice defects.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Ceramics
Guoguang Yao, Jingjing Tan, Jiaxin Yan, Meiqi Liu, Cuijin Pei, Yanmin Jia
Summary: By utilizing sintering aid and reinforcement phases, Li3Mg4NbO8-LiF-Ba-3(VO4)(2) composite ceramics were studied for their sinterability, microstructures, and microwave dielectric performances, showing the advantages of low sintering temperature and improved thermal stability. The combination of LiF-Ba-3(VO4)(2) phases demonstrated promising microwave dielectric properties, making it potentially suitable for use in LTCC technology.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Zhiyu Ma, Weijia Guo, Zhenxing Yue
Summary: TiO2 addition in BSNTA ceramics improves the dielectric constant and temperature coefficient of resonant frequency. Sintering in oxygen enhances the density, dielectric constant, and Q x f value due to the reduction in defect concentration. The research provides new insight into the impact of sintering atmosphere on the Q x f value of titanate ceramics.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Tao Yu, Qihang Yang, Hengheng Feng, Hongtao Yu
Summary: Ca0.128Ba0.032Sm0.46Li0.3TiO3-x wt.% Al2O3 microwave dielectric ceramics with temperature stability were prepared using the solid-state reaction method. The effects of Al2O3 doping on the phase composition, micromorphology, and microwave dielectric properties of the ceramics were investigated. Al2O3 doping improved the microwave dielectric properties by modifying the morphology and lattice structure of the ceramics.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Amir Sohail Khan, Burhan Ullah, Nikola Novak, Hamayun Khan, Amir Ullah
Summary: The structural instability, relaxor ferroelectricity, and microwave dielectric properties of Sr(1-x)CexTi(1-2/3y)MgyO3 ceramic samples (sintered in 5%H2 and 95%N2 atmosphere) were systematically studied. The results show that the structural symmetry of the samples varies with different doping concentrations, and there is a frequency-dependent dielectric maxima and intrinsic ferroelectric nature. The sample with x=0.15 exhibits low microwave dielectric permittivity, good temperature stability of resonance frequency, and high Q-factor.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Junqi Chen, Weishuang Fang, Ying Tang, Jie Li, Liang Fang
Summary: Doping LiF can effectively optimize the microstructure and improve the relative density of LiInO2 ceramics, enhancing the microwave dielectric properties. Studies also show that doping LiF can compensate for the volatilization of Li during high temperature sintering, thereby improving the material's performance.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Electrical & Electronic
Hongyang Zhang, Cheng Liu, Liang Shi, Wenhao Xu, Gang Wang, Xing Zhang, Rui Zeng, Huaiwu Zhang
Summary: The microwave dielectric ceramics of Li-3(Mg1-xZnx)(2)SbO6 with Zn2+ substitution showed remarkable properties, with the sample at x = 0.04 exhibiting a high Q x f value of 97,719 GHz. The study indicates promising applications of these ceramics in 5G communication.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(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)
Article
Materials Science, Ceramics
Ying Wang, Ben-ben Cao, Ming-an Shi, Wang-suo Xia, Hai-tao Wu
Summary: Novel ceramic series Re2Ce6O15 (Re--Y, Sm, Nd, La) were designed and successfully prepared using solid-state reaction method based on the cubic fluorite structure. The ceramics exhibited a single phase with CeO2-type structure, belonged to Fm-3m space. The crystal structure's formation mechanism and lattice constant were investigated using Rietveld structural refine method. The microstructure, dielectric constant, quality factors, and temperature coefficient of resonance frequency of the ceramics were evaluated and analyzed.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Ping Zhang, Xin Tian, Xinyue Fan
Summary: The effect of ionic substitution in pure Li3Mg4NbO8 ceramics was investigated for the first time. By replacing Mg2+ with appropriate amounts of Zn2+, a novel Li-3(Mg1-xZnx)(4)NbO8 ceramic with improved properties was successfully synthesized. The relationship between crystal structure and properties was established, and doping with Zn2+ was found to enhance the ceramic's properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Xin Qu, Sen He, Qing Li, Shan Deng, Yaqi Xiao, Kaiyang Liu, Xiuli Chen, Jun Liang, Huanfu Zhou
Summary: Ca1.15RE0.85Al0.85Ti0.15O4 (RE = Nd, La, Y) ceramics were prepared by reaction sintering method. The sintering behavior, phase composition, microstructure, and microwave dielectric performances were investigated. It was found that CNAT and CYAT ceramics sintered at 1500°C exhibited the best microwave dielectric properties.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Shicheng Zhou, Qiang Wu, Hanrui Xu, Xiaowen Luan, Sang Hu, Xianjie Zhou, Sen He, Xi Wang, Hailin Zhang, Xiuli Chen, Huanfu Zhou
Summary: This study synthesized CaTiO3LnAlO3(Ln=La, Nd) ceramics using reaction sintering method, showing excellent performance parameters and high temperature stability.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Deyong Zheng, Huihui Jin, Yucong Liao, Pengxia Ji
Summary: In this study, a highly stable and efficient catalyst, fluorine-doped Co3O4 (F-Co3O4), was developed for hydrogen production by water electrolysis. The F-Co3O4 catalyst exhibited a remarkable reduction in overpotential and demonstrated excellent stability for over 100 hours.
Article
Materials Science, Multidisciplinary
Ziwen Lv, Jintao Wang, Fengyi Wang, Jianqiang Wang, Fuquan Li, Hongtao Chen
Summary: Adding Cu6Sn5 nano particles can effectively inhibit the overgrowth of intermetallic compounds at the interfaces of solder joints in electronic devices, providing a solution to this issue. A new growth mechanism of intermetallic compounds at the interfaces was identified.
Article
Materials Science, Multidisciplinary
Jun Wang, Jiawei Chen, Wanru Liao, Fangyang Liu, Min Liu, Liangxing Jiang
Summary: A BiOI/AgI/Ag plasmonic heterostructure photocathode was successfully designed through electrodeposition, ion-exchange, and illumination methods. This photocathode exhibits superior performance in photoelectrochemical water splitting.
Article
Materials Science, Multidisciplinary
Xiaoxiao Liu, Xianxian Zhou, Xiaotao Ma, Qinbo Yuan, Shibin Liu
Summary: In this study, the authors propose a method to accelerate the reaction of polysulfides in lithium-sulfur batteries using a Ni@OC Mott-Schottky heterojunction as a catalyst. The experimental results demonstrate that the charge redistribution at the Ni@OC interface accelerates electron transfer and enhances catalytic activity, leading to improved reaction kinetics and battery performance.
Article
Materials Science, Multidisciplinary
Dayou Ma, Mohammad Rezasefat, Joziel Aparecido da Cruz, Sandro Campos Amico, Marco Giglio, Andrea Manes
Summary: The matrix has a significant effect on the impact resistance of composite materials. Replacing a brittle polymer with a more flexible one can improve impact resistance, but it poses challenges to standard testing methods. This study designs a new fixture for testing the low-velocity impact of soft composites and investigates the effect of the fixture on the mechanical performance.
Article
Materials Science, Multidisciplinary
Lingchang Wang, Qihang Yang, Huzhen Li, Ming Wei, Qian Wang, Zhenzhong Hu, Mengmeng Zhen
Summary: Bronze titanium dioxide (TiO2(B)) is a promising anode material for lithium-ion batteries due to its high specific capacity. However, its practical applications are hindered by poor conductivity and limited electrochemical kinetics. In this study, TiO2(B)-carbon nanosheets heterostructures are synthesized to enhance the cycling performance and rate capability of TiO2(B).
Article
Materials Science, Multidisciplinary
Atul Thakur, Ritesh Verma, Ankush Chauhan, Fayu Wan, Preeti Thakur
Summary: In this study, BaFe12O19 and BaFe12O19: Epoxy (50:50) nanocomposites were synthesized using the co-precipitation method. The structural information and material properties, such as crystallite size and electrical conductivity, were characterized by XRD, FESEM, EDX, and TEM techniques.
Article
Materials Science, Multidisciplinary
Jingyu Wu, Xinyan Ma, Yong Yang
Summary: A well-defined CoS2@NC(CS-500) hierarchical binder-free catalyst cathode is constructed through in-situ grown of ZIF-67 on carbon cloth and high-temperature carbonization. The cathode shows excellent reaction kinetics and electrochemical performance, providing inspiration for developing advanced Li-CO2 battery catalysts.
Article
Materials Science, Multidisciplinary
Svetlana M. Posokhova, Vladimir A. Morozov, Kirill N. Boldyrev, Dina Deyneko, Erzhena T. Pavlova, Bogdan I. Lazoryak
Summary: This study explores the impact of synthesis method and composition on the structure and luminescence properties of K5Eu1-xHox(MoO4)4 with the palmierite-type matrix. The co-doping of Eu3+ and Ho3+ ions plays a critical role in manipulating charge transfer and luminescence efficiency in the visible and infrared regions.
Article
Materials Science, Multidisciplinary
Jian Wang, Yeting Tao, Jingsheng Wang, Youtian Tao
Summary: A new electron-transport material iTPyBI-CN is developed through non-catalytic C-N coupling reaction. It exhibits better electroluminescence efficiency in organic light-emitting diodes compared to the commercial material TPBI, due to its twisted geometry and higher energy levels.
Article
Materials Science, Multidisciplinary
Tao Zhu, Feng Huang, Shuo Li, Yang Zhou
Summary: This article combines XRD analysis and microscopic structural observation to investigate the changes in limestone after high-temperature treatment. It finds that 500 degrees C is the critical temperature for crystalline and spatial arrangement changes in limestone, and the thermal conductivity, specific heat capacity, and heat storage coefficient gradually decrease after thermal treatment.
Article
Materials Science, Multidisciplinary
Muhammad Haekal Habibie, Fransiska Sri Herwahyu Krismastuti, Abdi Wira Septama, Faiza Maryani, Vivi Fauzia
Summary: This study focuses on the synthesis of zinc oxide nanostructure from zinc recovered from galvanization ash and highlights its potential as a sustainable source of zinc and as an antibacterial agent.
Article
Materials Science, Multidisciplinary
Jingyi Li, Yixin Xing, Wei Gu, Shousi Lu
Summary: In this study, PC@CaP microparticles were fabricated using biomimetic mineralization. The results showed that under environmental stress, PC@CaP exhibited improved stability and antioxidative activity, indicating its potential use in high-added value fields.
Article
Materials Science, Multidisciplinary
Yan Liu, Shunyou Chen
Summary: In this study, TNTs were used as a drug carrier and modified with ZIF-8 and silk fibroin to obtain a new drug loading platform. The results showed that this drug-loaded platform had a good drug release effect in vitro and could promote cell proliferation and osteogenic differentiation.
Article
Materials Science, Multidisciplinary
Chunhui Zhu, Wentao Wang, Qing Zhen, Xinning Huang, Shixin Li, Shaochang Wang, Xiaoping Ma, Xiaoxia Liu, Yalong Jiao, Kai Sun, Zhuangzhi Li, Huaixin Yang, Jianqi Li
Summary: A type of stacking fault is revealed in e-InSe crystal, which is associated with a small stacking-fault energy and shows exceptional plasticity.