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
B. Masin, K. Ashok, H. Sreemoolanadhan
Summary: Microwave dielectric ceramic powder of 0.95(Mg0.95Zn0.05)TiO3-0.05CaTiO(3) (MCT) was prepared using solid-state reaction method and different sintering techniques were employed. The hybrid microwave sintering technique showed better dielectric properties compared to other techniques.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
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
Materials Science, Ceramics
Yanjun Liu, Guoqiang He, Yinghan He, Haiqing Deng, Xiaoli Wei, Pengxiang Gao, Hongtian Li, Hailan Qin, Xin Qu, Yaqi Xiao, Shan Deng, Kaiyang Liu, You Wu, Huanfu Zhou
Summary: Sr3Y2Ge3O12 ceramics with cubic garnet structure were prepared by solid-phase reaction. The ceramics exhibited relatively dense and homogeneous microstructures with clear grain boundaries at the optimum sintering temperature, as confirmed by X-ray diffraction and scanning electron microscopy. The dielectric constant and quality factor showed a strong correlation with bulk density. The sintered Sr3Y2Ge3O12 ceramic at 1275 degrees C demonstrated good microwave dielectric properties, with epsilon r = 7.23, Q x f = 27203 GHz, and tau f =-26.79 ppm/degrees C. The value of Q x f increased to 45000 GHz at an ambient temperature of 150 degrees C. A high bulk density of 4.68 g/cm3 and a relative density of 92.9% were also achieved.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Guoqiang He, Xinyue Ma, Yanjun Liu, Yinghan He, Yaqi Xiao, Xin Qu, Shan Deng, Kaiyang Liu, Xi Wang, Shicheng Zhou, Qing Li, Zhengli Dai, You Wu, Xiuli Chen, Huanfu Zhou
Summary: A SrY2O4 microwave dielectric ceramic suitable for 5G systems is synthesized via a solid-state reaction, showing excellent performance at the optimal sintering temperature and indicating to be a good choice for 5G equipment.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Enda Zhao, Jianyu Hao, Xian Xue, Mingming Si, Jing Guo, Hong Wang
Summary: A sintering route named cold sintering assisted two-step sintering process (CSP-TS) was introduced to prepare rutile TiO2 ceramics with submicron grain sizes. This method showed successful preparation of ceramics with excellent microwave dielectric properties at low sintering temperatures.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Biochemistry & Molecular Biology
Porntip Siriya, Pairot Moontragoon, Pornjuk Srepusharawoot, Prasit Thongbai
Summary: The effects of sintering temperature and doping level concentration on the microstructures, dielectric response, and electrical properties of W6+-doped TiO2 were investigated. The study found that increasing the doping level concentration led to increased grain size and improved low-temperature dielectric response.
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
Engineering, Electrical & Electronic
Zheng Liang, Xuening Han, Gang Wang, Yan Yang, Liang Shi, Wenxin Li, Jie Li, Huaiwu Zhang
Summary: Zn1.8SiO3.8 ceramics were successfully prepared in this study by controlling the sintering temperature and composition, suppressing the formation of the second phase to obtain Zn2SiO4 ceramics without secondary phase. The ceramics exhibited excellent dielectric properties at 1300 degrees Celsius sintering, making them suitable for wireless communication technology.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Ceramics
T. Gecil Evangeline, A. Raja Annamalai
Summary: The colossal dielectric response of La-doped CaCu3Ti4O12 ceramics has been investigated in this study. The effects of La3+ on the microstructural and crystallographic properties have been analyzed using SEM, EDS, and XRD. The results show that La-doped samples exhibit higher dielectric constant and lower loss factor than pure CCTO.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Bing Liu, Lei Li, Kai Xin Song, Min Min Mao, Zhilun Lu, Ge Wang, Linhao Li, Dawei Wang, Di Zhou, Antonio Feteira, Ian M. Reaney
Summary: In this study, a cold sintering process was used to pre-densify LiF ceramics, leading to significant grain growth and an increase in relative density to 92% after post-annealing treatments. The microwave quality factor (Qf) was greatly improved and reached a maximum of 110,800 GHz, making cold sintered LiF a promising component in low temperature co-fired ceramic formulations.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Physical
Yongqiang Li, Mupeng Zheng, Mankang Zhu, Yudong Hou
Summary: High-quality (Ca1-xBix)(Mo1-xVx)O-4 ceramics with a tetragonal scheelite structure were prepared at sintering temperatures of 800-925 degrees C. The increase in point defects led to an increase in extrinsic loss, affecting the Qxf value. The (Ca0.65Bi0.35)(Mo0.65V0.35)O-4 ceramic exhibited superior microwave dielectric properties, showing great potential for LTCC application.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Ruixin Yang, Mingxia Wang, Tianying Qin, Enzhu Li, Chaowei Zhong
Summary: In this study, SrWO4-x wt.% Li2MoO4 (x = 2.5, 5, 7.5, 10) ceramics were synthesized at low temperature using the solid-state synthesis method. The effect of Li2MoO4 on the crystallization, activation energy, microstructure, and sintering process were discussed in detail. Li2MoO4 significantly reduces the sintering temperature of SrWO4 and promotes the shrinkage and densification of the ceramic at low temperature. Specifically, the SrWO4 ceramics containing 5 wt% Li2MoO4 sintered at 875 degrees C exhibits the most favorable microwave dielectric properties, demonstrating potential applications in the field of low-temperature co-fired ceramics (LTCC).
CERAMICS INTERNATIONAL
(2023)
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
Min Yang, Yan Gao, Yong Zheng, Xuepeng Lu, Huimin Yang, Xiangyu Xu, Peng Wu
Summary: Ca1-xBaxMgSi2O6 ceramics were prepared through solid-state reaction sintering, and the effects of substituting Ba2+ for Ca2+, relative density, phase composition, crystal morphology, and microwave dielectric properties were studied. The results showed that a single phase was formed when x ≤ 0.2, while a second phase appeared at x = 0.4. The increase in Ba2+ substitution affected the microwave dielectric properties, with Qxf value first increasing and then decreasing, and epsilon(r) value continuously increasing. The z(f) value also slightly improved.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Jia-Jia Ren, Di Zhou, Da Li, Yan Guo, Wei-Chen Zhao, Tao Zhou, Li-Xia Pang
Summary: This study investigates the properties of Ban-3Bi4TinO3n+3 (n = 4-7) ceramics with Aurivillius structure, which are potential materials for high-temperature ferroelectric applications. By adjusting the number of BO6 octahedrons and (Bi2O2)(2+) layers, the layered structures are controlled, leading to improved dielectric temperature stability and voltage resistance of bismuth barium titanate ceramics. The influence of composition and microstructure on electrical properties is explored, and Ba2Bi4Ti5O18 ceramics show the best performance with a high energy storage density and efficiency.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Ruitao Li, Diming Xu, Max Avdeev, Lei Zhang, Xinfeng Chen, Gaoyang Gou, Dong Wang, Wenfeng Liu, Di Zhou
Summary: Dielectric ceramics are essential in electronic systems, and this research introduces a novel non-perovskite relaxor ferroelectric, Bi6Ti5WO22, which exhibits ultralow loss and highly tunable permittivity, making it highly promising for various applications.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Wen-Yi Li, Di Zhou, Da Li, Yan Guo, Wei-Chen Zhao, Li-Xia Pang, Shi-Kuan Sun
Summary: Lead-free ceramics with high energy storage density have been successfully prepared and improved by a membrane rolling process. These ceramics show potential application in high-energy-storage capacitors due to increased breakdown strength and energy storage density.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Chao Du, Xiang-Kun Li, Di Zhou, Shao-Fei Wang, Rui-Tao Li, Xiao-Gang Yao, Hui-Xing Lin, Hai-Yi Peng, Tao Zhou, Shi-Kuan Sun, Song Xia, Zhuo Xu
Summary: This paper proposes a high radiation efficiency 4 x 4 cylindrical dielectric resonator antenna (CDRA) array fabricated using the temperature stable 0.8Zn(2)SiO(4)-0.2TiO(2) composite ceramic. The fabricated CDRA array has enhanced measured radiation efficiency, high gain, and is a promising candidate for utilization in Sub-6 GHz 5G Base Station communications systems.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Materials Science, Multidisciplinary
Yan Guo, Di Zhou, Da Li, Weichen Zhao, LiXia Pang, Zhongqi Shi, Wenfeng Liu, Jinzhan Su, Tao Zhou, Shikuan Sun
Summary: In this study, BNT-SST/P(VDF-HFP) nanocomposites were prepared by adding 0.5 (Bi0.5Na0.5)TiO3-0.5(Sr0.85Sm0.1)TiO3 (BNT-SST) nanoparticles to the P(VDF-HFP) polymer matrix. The addition of BNT-SST nanoparticles improved the dielectric characteristics, breakdown strength, insulation, and mechanical properties of the nanocomposites. The energy-storage density and efficiency of the 0.7 vol% BNT-SST/P(VDF-HFP) composites were significantly higher than other polymer matrix composites, suggesting the importance of inorganic nanoparticles in improving the energy-storage performance of polymer-based film capacitors.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Li-Xia Pang, Sen Ren, Xiao-Long Wang, Di Zhou, Wei-Guo Liu, Charanjeet Singh, Antonio Sergio Bezerra Sombra, Moustafa Adel Darwish
Summary: The compounds xBi(Mg2/3Nb1/3)O-3-(1 - x)(Ba0.8Sr0.2)TiO3 (xBMN-(1 - x)BST, 0.08 <= x <= 0.14) were synthesized using the traditional solid-state reaction method and were well sintered at temperatures ranging from 1280 to 1330 degrees C. X-ray diffraction analysis confirmed the perovskite structure of the ceramics. The addition of BMN effectively reduced the grain size and resulted in more uniform microstructures, leading to improved breakdown strength and energy storage properties.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Physical
Xiao Li, Diming Xu, Di Zhou, Shengzhao Pang, Chao Du, Moustafa Adel Darwish, Tao Zhou, Shi-Kuan Sun
Summary: In this paper, a flexible carbon cloth-based substrate is introduced to tune the structure of the material at the macroscopic scale. The stacking mode and the in situ growth of magnetic mace-like NiCo2O4 on the carbon cloth are found to play crucial roles in the electromagnetic wave response behavior and the microwave absorption performance. The 1D nanopin arrays anchored on the carbon cloth further improve the microwave absorption performance. This work provides new ideas for the design and preparation of high absorption capacity and wide broadband response.
Article
Chemistry, Physical
Xiao Li, Diming Xu, Di Zhou, Shengzhao Pang, Chao Du, Moustafa Adel Darwish, Tao Zhou, Shi-Kuan Sun
Summary: Due to their high specific surface area and electrical conductivity, 2D materials are widely used for microwave absorption in order to address the issues of electromagnetic wave pollution caused by wearable electronic devices and 5G communication. However, the inadequate dielectric loss capacity poses a major challenge for the application of 2D-based microwave absorbers. To overcome this, researchers developed a vertical heterostructure architecture to synthesize MXene/rGO films with different impedance gradients. The MrG film with 80 wt% rGO content exhibited excellent microwave absorption, with a minimum reflection loss value of -44.3 dB and an effective absorption bandwidth of 4.84 GHz at a thickness of 1.5 mm. This enhanced dielectric loss capacity is attributed to the vertically stacked heterostructures, which provide new electron transport channels along the vertical direction of the films. Visualized power loss density simulations confirmed the synergistic interaction between MXene and rGO, further increasing microwave absorption. This finding offers an alternative approach for the development of efficient, customizable, simple, and low-cost 2D material-based absorbers through the control of vertical heterostructure formation.
Article
Materials Science, Ceramics
Xiaolong Wang, Lixia Pang, Di Zhou, Zhen Fang, Sen Ren, Weiguo Liu
Summary: (NaY)(1/2)MoO4 ceramics were synthesized using the solid-state reaction method with Na2CO3, Y2O3, and MoO3. Scanning electron microscopy showed that the ceramics could be well densified at sintering temperatures between 900-960 degrees C. X-ray diffraction analysis confirmed that the ceramics had a tetragonal scheelite structure. Sintering at 940 degrees C for 2 hours optimized the microwave dielectric properties, resulting in a microwave permittivity of 10.9, Q x f of 29,000 GHz, and TCF of -40.7 ppm/degrees C for (NaY)(1/2)MoO4.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Jia-Pei Jiang, Di Zhou, Wei Wang, Chang-Hao Wang, Zhong-Qi Shi, Wen-Feng Liu, Tao Zhou, Ya-Wei Chen, Qi-Xin Liang, Mei-Rong Zhang
Summary: (CoxZn1-x)TiNb2O8 (x = 0.2-0.8) microwave dielectric ceramics were synthesized via solid-state reaction and the correlation between microwave dielectric properties and crystal structure was discussed. The crystal structures were investigated by X-ray powder diffraction. Composition-induced phase transitions were observed and the microwave dielectric properties were found to change with crystal structural transitions. These findings have significant implications for the development of microwave dielectric ceramics in practical applications.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Diming Xu, Haowei Zhang, Lixia Pang, Fayaz Hussain, Tao Zhou, Shi-Kuan Sun, Zhijiao Chen, Di Zhou
Summary: In this work, a novel monoclinic Scheelite structure phase of Bi(Ge0.5Mo0.5)O-4 is reported, with similar properties to BiVO4. The new phase exhibits a dielectric permittivity of approximately 35, a Qf value of around 20000 GHz, and a TCF value of -46 ppm/°C. These findings demonstrate the potential of the new Scheelite structure phase for modifying and substituting BiVO4 in various applications.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Da Li, Diming Xu, Weichen Zhao, Max Avdeev, Hongmei Jing, Yan Guo, Tao Zhou, Wenfeng Liu, Dong Wang, Di Zhou
Summary: We successfully developed a series of lead-free dielectric ceramics for high-temperature energy storage capacitors with near-zero energy loss. The designed heterostructure embedding rhombohedral and tetragonal polar nanoregions in a cubic paraelectric matrix contributes to a large recoverable energy density of 10.28 J cm(-3) and a record-high energy efficiency of 97.11%. The wide-temperature stability (25-200 degrees C) and high performance (recoverable energy density of 6.35 +/- 9.1% J cm(-3), energy efficiency of 94.82% +/- 3.4%) of the dielectric ceramics broaden their application in high temperature energy storage systems.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Marwa M. Hussein, Samia A. Saafan, H. F. Abosheiasha, Di Zhou, D. S. Klygach, M. G. Vakhitov, S. V. Trukhanov, A. V. Trukhanov, T. I. Zubar, K. A. Astapovich, Hesham M. H. Zakaly, Moustafa A. Darwish
Summary: Nanosized spinel ferrites Co1-xNixFe2O4 (where x = 0.0-1.0), or CNFO, were produced via a chemical method. X-ray diffraction (XRD) was used to determine the crystal structure's characteristics. It was found that all samples had a single phase with cubic syngony (space group Fd3m). The lattice parameter and unit cell volume were found to correlate with the ionic radii and coordination numbers of Co2+ and Ni2+ ions, with an increase in Ni2+ content leading to a decrease in lattice parameter and unit cell volume.
Article
Chemistry, Physical
Xiao Li, Diming Xu, Di Zhou, Hu Nan, Shengzhao Pang, Moustafa Adel Darwish, Tao Zhou, Shi-Kuan Sun
Summary: Ti-based oxides are attractive anode materials for high-performance lithium-ion batteries due to their excellent intrinsic safety, stable crystalline structure, superior rate performance, and abundance resources. However, the energy densities of most Ti-based anode materials are unsatisfactory due to their relatively high working voltage. In this study, a new Ti-based oxide, LiSmTiO4 (LSTO), was investigated as an anode material for lithium-ion batteries, showing low-voltage lithium storage. The synthesized LSTO exhibited a high capacity, higher specific capacity and output voltage when paired with the same cathode, and excellent cycling performance.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Materials Science, Multidisciplinary
Yan Guo, Di Zhou, Da Li, Weichen Zhao, Yifei Wang, Lixia Pang, Zhongqi Shi, Tao Zhou, Shikuan Sun, Charanjeet Singh, Sergei Trukhanov, Antonio Sergio Bezerra Sombra, Guohua Chen
Summary: With the rapid development of the electronic and electrical industry, there is a demand for dielectric capacitors with higher energy storage capacity. This study developed sandwich-structured nanocomposites, consisting of KNN-BZT NPs as the interlayer and P(VDF-HFP) as the outer layer, to overcome the contradiction between high breakdown strength and dielectric constant. Experimental results showed that these nanocomposites have significantly improved energy storage performance compared to P(VDF-HFP). The sandwich-structured nanocomposites provide an economical and efficient strategy to enhance the ability of film capacitors to store energy.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Physical
J. Zamora, T. Bautista, N. S. Portillo-Velez, A. Reyes-Montero, H. Pfeiffer, F. Sanchez-Ochoa, H. A. Lara-Garcia
Summary: Experimental and DFT studies were conducted on the structural, magnetic, and optical properties of RFeO3 perovskites. The perovskites exhibited an orthorhombic crystal structure and weak ferromagnetic behavior. They were confirmed to be semiconductors with a bandgap of approximately 2.1 eV.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xianxiang Lv, Jing Jin, Weiguang Yang
Summary: By depositing TiN and TiO2 surface layers on AlSi films, the electrochemical performance of silicon-based anodes can be significantly improved, suppressing volume expansion and promoting the formation of a stable SEI layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Sharafat Ali, Haider Ali, Syedul Hasnain Bakhtiar, Sajjad Ali, Muhammad Zahid, Ahmed Ismail, Pir Muhammad Ismail, Amir Zada, Imran Khan, Huahai Shen, Rizwan Ullah, Habib Khan, Mohamed Bououdina, Xiaoqiang Wu, Fazal Raziq, Liang Qiao
Summary: The construction and optimization of redox-heterojunctions using a bifunctional phosphate as an electron-bridge demonstrated significant improvements in photo catalytic activity, including enhanced dispersion, reduced interfacial migration resistance, and increased abundance of active-sites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ren-Ni Luan, Na Xu, Chao-Ran Li, Zhi-Jie Zhang, Yu-Sheng Zhang, Jun Nan, Shu-Tao Wang, Yong-Ming Chai, Bin Dong
Summary: Extensive research has revealed that oxygen evolution reaction (OER) in alkaline conditions involves dynamic surface restructuring. The development and design of sulfide/oxide pre-catalysts can reasonably adjust the composition and structure after surface reconstruction, which is crucial for OER. This study utilized a simple two-step hydrothermal method to achieve in situ S leaching and doping, inducing the composition change and structure reconstruction of CoFe oxides. The transformed FeOOH and CoOOH exhibited excellent OER activity and could be easily mass-produced using low-cost iron based materials and simple methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jun'an Lai, Daofu Wu, Peng He, Kang An, Yijia Wang, Peng Feng, WeiWei Chen, Zixian Wang, Linfeng Guo, Xiaosheng Tang
Summary: Zero-dimensional organic-inorganic metal halides (OMHs) are gaining attention in the fabrication of light-emitting diodes due to their broad emission band and high photoluminescence quantum yield. This work synthesized a zero-dimensional organic tetraphenylphosphonium bismuth chloride (TBC) that showed efficient blue light emission, with the emission mechanism attributed to the transition of Bi3+ ions. White light-emitting diodes (WLEDs) were fabricated using TBC, along with green-emitting and red-emitting single crystals, achieving single-component white emissions. These findings demonstrate the different emission mechanism of ns2 ions-based OMHs and highlight the potential of bismuth-based OMHs in WLEDs applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xuewei Liang, Yunhai Su, Taisen Yang, Zhiyong Dai, Yingdi Wang, Xingping Yong
Summary: The revolutionary design concept of high-entropy alloys has brought new opportunities and challenges to the development of advanced metal materials. In this work, AlCrCuFe2NiTix high-entropy flux cored wires were prepared by combining the design idea of a high-entropy alloy with the characteristics of flux cored wire. AlCr-CuFe2NiTix high-entropy surfacing alloys were prepared using gas metal arc welding technology. The wear properties of the alloys were analyzed, and the phase composition, microstructure, strengthening mechanism, and wear mechanism were discussed. The results show that the alloys exhibit a dendritic microstructure with BCC/B2 + FCC phases. Increasing Ti content leads to the precipitation of Laves phase. The alloys show improved microhardness and wear resistance due to the precipitation of coherent B2 and Laves phases. However, excessive Ti addition results in the increase of Laves phase and reduced wear resistance of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
M. Vadivel, M. Senthil Pandian, P. Ramasamy, Qiang Jing, Bo Liu
Summary: This work presents the enhanced photocatalytic and electrochemical performance of g-C3N4 assisted PAA on CoFe2O4 ternary nanocomposites. The incorporation of PAA and g-C3N4 improves the separation efficiency of photogenerated charge carriers, resulting in superior photocatalytic degradation and high specific capacitance values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Vibhu T. Sivanandan, Ramany Revathy, Arun S. Prasad
Summary: In this study, pure and doped cobalt ferrite nanoparticles were prepared using the sol-gel auto-combustion method with the aid of lemon juice as eco-fuel. The crystal structure, lattice parameter, crystallite size, microstrain, optical parameters, and room temperature magnetic properties of the samples were analyzed. The effect of doping on the magnetic properties was also investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qing Guo, Bowen Zhang, Benzhe Sun, Yang Qi
Summary: This study prepared ZnO films with various nonpolar preferred orientations using conventional chemical bath deposition method and characterized their growth process and mechanism. It was found that the type and concentration of nitrate could control the preferred orientation and surface roughness of ZnO films. Additionally, ZnO films with different preferred orientations exhibited different optical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Chong Zhang, Yan Liu, Zhaoyan Wang, Hang Yang
Summary: In this study, six bimetallic FeCo particles were synthesized via the hydrothermal method at different Fe:Co ratios. The Fe:Co ratio not only modulates the composition of the particles but also influences their structure and magnetic properties. The FeCo alloys showed a transformation from an Fe-based structure to a Co-based structure with increasing Co content. The Fe:Co ratio of 1:1 and 3:1 resulted in particles with the highest and lowest saturation magnetization, respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jianning Zhang, Jing Li, Yiren Wang, Xiaodong Mao, Yong Jiang
Summary: We conducted a study on the formation of ultra-fine Y-Ti-Ta-O nano-oxides in Ta+B micro-alloyed 13CrWTi-ODS alloys using electron microscopy and first-principles calculations. The Y-Ti-Ta-O nano-oxides were found to be mainly Y2(Ti,Ta)2O7, with an average size of 7 nm and a number density of 6.8 x 1023 m-3. Excess boron was found to enhance the adhesion of some low-sigma grain boundaries but weaken the Fe/Y2Ti2O7 interface, while excess tantalum enhanced the Fe/Y2Ti2O7 interface but caused serious degradation of grain boundaries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Yirong Fang, Pei Cheng, Hang Yuan, Hao Zhao, Lishu Zhang
Summary: A new composite system of nitrogen-doped reduced graphene oxide and black phosphorus quantum dots has been developed for tumor therapy, showing improved electrochemical properties and stability. The system generates hydrogen peroxide and hydroxyl radical to effectively kill tumor cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xiufang Qin, Yuanli Ma, Hui Zhang, Ting Zhang, Fang Wang, Xiaohong Xu
Summary: The structure and magnetism of cobalt ferrites after Mn2+-Tb3+ co-doping were studied. Co-doped samples exhibited cubic spinel structure and spherical shape of ferrite nanoparticles. The redistribution of Co2+ and Fe3+ ions between octahedral and tetrahedral sites was observed due to Mn2+-Tb3+ co-doping. The coercivity and magnetization saturation of co-doped samples were significantly improved, leading to a maximum energy product that is 190% higher than that of the un-doped sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee
Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu
Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
