Article
Materials Science, Ceramics
Shuang Chen, Chang-Shun Wang, Wen Zheng, Jia-Min Wu, Chun-Ze Yan, Yu-Sheng Shi
Summary: Alumina mold materials prepared by stereolithography exhibit significant sintering shrinkage, with properties related to casting rarely studied. This study investigates the effects of particle size distribution and sintering temperature on these materials, finding that factors such as fine powder fraction impact viscosity, curing behaviors, and sintering shrinkage.Optimal sintering temperature is determined to be 1550 degrees C, with specimens prepared with a 0.1 fraction of fine powder showing the best creep resistance and mechanical properties.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Shipeng Yang, Lang Liu, Yu Liu, Ye Hong
Summary: The sintering process of TiO2 nanoparticles with different particle sizes and temperatures was studied using molecular dynamics simulations. It was found that the merge of surface atoms initiates the sintering process when two particles contact, leading to homogeneous merging of the particles. At high temperatures, the heating provides kinetic energy for atom migration, resulting in faster sintering. Additionally, there is a significant difference in sintering speed between 1600 and 1800 K, and smaller temperature changes have a large impact on the sintering rate near the melting point.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Engineering, Electrical & Electronic
Reza Gholipur
Summary: In this study, Mn1-xZrxFe2O4 nanoparticles were prepared using the chemical sol-gel method, and their magnetic and dielectric properties were investigated. The results showed that the substitution of Zr can improve the magnetic and absorption properties of manganese ferrite, providing new possibilities for device applications.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Materials Science, Ceramics
Guixiang Liu, Bo Dai, Yong Ren, Heming He, Weitong Zhang
Summary: Polycrystalline nickel zinc (NiZn) ferrite ceramics composed of sub-micron grains were successfully prepared via an electric current-assisted sintering method using a Ni0.75Zn0.25Fe2O4 nanopowder. The specific saturation magnetization of the sintered samples increased with sintering temperature, while the coercivity and ferromagnetic resonance linewidth decreased.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
D. H. Manh, T. D. Thanh, T. L. Phan, D. S. Yang
Summary: We fabricated CoFe2O4 nanoparticles with varying crystallite size using coprecipitation and mechanical milling methods. X-ray diffraction and Raman scattering studies confirmed the spinel structure of the samples. The lattice constant and residual strain increased with increasing milling time, leading to changes in the magnetic properties. Analysis of magnetization data revealed changes in coercivity and saturation magnetization. X-ray absorption data indicated a mixed valence state of Fe-2+,Fe-3+, and Co2+ ions, suggesting the migration and redistribution of these cations and lattice distortions impacted the magnetic properties of the nanoparticles.
Article
Chemistry, Physical
Ying Zhao, Deng-Xue Ma, Feng-Qi Zhao, Si-Yu Xu, Xue-Hai Ju
Summary: This study investigated the reaction mechanism of molten Al nano-droplets (ANDP) and H2O vapor at high temperature using reactive molecular dynamics. The combustion behavior of ANDP was found to involve outward extending growth of the oxidized phase and micro-explosion. The uncovering of details in the reaction process can guide the application of Al/H2O fuel and Al/H2O hydrogen production technology.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Ceramics
Hongpeng Zheng, Guoyao Li, Hezhou Liu, Yongmin Wu, Huanan Duan
Summary: This study investigated the physicochemical properties of dry- and wet-milled LLZTO particles and found that dry-milled LLZTO powder exhibited higher reactivity and better particle characteristics, resulting in higher room temperature ionic conductivity. The sintered LLZTO ceramic pellets prepared from these dry-milled powders showed excellent discharge performance in lithium-sulfur batteries.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Nan Li, Di An, Zhongzhou Yi, Nuoting Yu, Zhipeng Xie
Summary: A novel sol-gel-flux method was used to synthesise 1Y6Ce-ZrO2 nanoparticles, with the NaCl + KCl system showing lower preparation temperature and improved dispersion and sintering performance compared to the NaCl system.
CERAMICS INTERNATIONAL
(2022)
Article
Thermodynamics
Atsushi Makino, Hayato Sano
Summary: This study focuses on the extinction of carbon particles during combustion, with attention to both the lower and upper limits of critical conditions. Analytical expressions for the limit of particle diameter were obtained, and comparisons with experimental data showed a fair degree of agreement, confirming that reducing particle size does not necessarily favor combustion.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Engineering, Chemical
Daniele Sofia, Domenico Macri, Diego Barletta, Paola Lettieri, Massimo Poletto
Summary: This study examines the selective laser sintering of Titania powders to understand the impact of initial material properties and process conditions on the degree of sintering/melting and mechanical properties of the produced semi-3D artefact. Experimenting with different particle sizes, the research evaluates the effects of process variables such as laser power and scan speed on product properties, and uses measured tensile strength to estimate the size of sintered necks. Results are compared with values predicted by literature models to provide insights into the SLS process.
Article
Chemistry, Physical
Christopher Karpovich, Elton Pan, Zach Jensen, Elsa Olivetti
Summary: Data-driven synthesis planning with machine learning is a key step for designing and discovering novel inorganic compounds. Recent developments in natural language processing enable large-scale text mining of scientific literature to provide databases of synthesis information. Supervised classification machine learning models are used to differentiate synthesis routes, while regression models predict appropriate temperatures and times for synthesis steps. The models show promise in predicting suitable reaction routes and conditions for previously unsynthesized compounds.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Hongwei Yang, Meijun Guo, Fang Xu, Yulong Liao, Yong Ren, Guixiang Liu, Honglan Lai, Bochengwen Sun, Bo Dai
Summary: In this study, the effects of adding nano-LiZn ferrite and V2O5 particles to LiZnTi ferrite were investigated. The addition of nano-LiZn led to a change in the microstructure, with the grains becoming more uniform and dense. The saturation magnetization (Ms) increased with increasing LiZn content and the addition of 4.0 wt.% nano-LiZn and 0.60 wt.% V2O5 resulted in improved magnetic properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Jun Zhou, Yaning Lin, Hongwei Yang, Yong Ren, Fang Xu
Summary: Interest in enhancing magnetic performances of low-sintered ceramic materials by co-doping of oxide nanoparticle and low-melting glass has thrived. Usually this process includes performance enhancement of ceramic attributed to grain growth and deterioration caused by excess additives.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Mechanics
Li Sun, Tianqi Liang, Chunwei Zhang, Jianyun Chen
Summary: This study investigates the compounded shear-thickening fluids (STFs) consisting of needlelike carbon fiber powder (CFP), silicon dioxide (SiO2), and polyethylene glycol (PEG). The compounded STFs exhibit significant rheological behavior and shear-thickening effects, and show excellent energy dissipation capacity and dynamic stability. The key performance index of the compounded STFs is demonstrated to be improved by ten times or even higher, making it a novel type of STFs for engineering practice.
Article
Materials Science, Ceramics
Yao Ying, Xianbo Xiong, Nengchao Wang, Jingwu Zheng, Jing Yu, Wangchang Li, Liang Qiao, Wei Cai, Juan Li, Hui Huang, Shenglei Che
Summary: The influence of LiBO2 on sintered Mn-Zn ferrites was studied, and with the addition of LiBO2 sintering aid, high-quality samples could be prepared at lower temperatures, exhibiting good magnetic properties and power loss characteristics.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
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)