Article
Materials Science, Ceramics
Suman Pawaria, Jyoti Ahlawat, Preeti Sharma, Sajjan Dahiya, Anil Ohlan, R. Punia, A. S. Maan
Summary: The glass transition and crystallization kinetics of lithium-modified zinc borate glasses with different compositions were studied using differential scanning calorimetry. The glass composition of 20ZnO·10Li2O·70B2O3 showed the highest thermal stability and glass-forming tendency among all other compositions. The activation energies for crystallization and glass transition were determined and found to be in close agreement with each other. The formation of a pure monoclinic LiZnBO3 crystalline phase was observed in certain compositions, which has potential for electric double-layer capacitance fabrication.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Y. C. Tang, G. T. Ma, N. Nollmann, G. Wilde, M. Zeng, C. H. Hu, L. Li, Chengying Tang
Summary: A comparative study was conducted on the thermal stability and kinetics of crystallization of melt-spun and bulk Pd77.5Cu6Si16.5 metallic glasses. The results showed that the Pd77.5Cu6Si16.5 amorphous alloys have excellent thermal stability, with the bulk metallic glass exhibiting better stability than the ribbon. The crystallization processes of both the ribbon and the bulk metallic glass were found to be controlled by volume nucleation with different nucleation rates, as indicated by the local Avrami exponent.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Ceramics
Abhiram Senapati, Suvendu Kumar Barik, Pradyumna Kumar Parida, Hrudananda Jena
Summary: Sodium niobium phosphate (SNP) glasses with different compositions were prepared and their non-isothermal kinetics of glass transition and crystallization were studied. The activation energy of glass transition was deduced from the dependence of glass transition temperature on the heating rate. The average activation energies of crystallization were calculated by different kinetic methods. The nucleation and growth of various crystalline phases formed on heat treatment were investigated through Avrami exponents and SEM analysis.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Thermodynamics
Jili Wu, Ziyi Zhou, Jiaojiao Yi, Zhen Peng
Summary: Alloying effects of adding small quantities of Al, Ni, and Si elements into a base bulk metallic glass were studied, with Ni at 0.5 at% showing a more significant constraint on crystallization compared to Al and Si at the same quantity. The results indicate that alloying with Ni may favor the suppression of crystallization processes.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
Tao Xu, Leilei Zhang, Xuan Li, Longchao Zhuo, Gong Li, Enhuai Yin, Ziqi Jie, Zengyun Jian
Summary: This study investigated the influence of similar solute element Ga microalloying for Al on the non-isothermal crystallization kinetics between novel light RE-based La58Al26Ga4C12 metallic glass (MG) and the progenitor La58Al30C12 MG. It was found that Ga microalloying for Al enhanced the difficulty of non-isothermal crystallization, resulting in enriched crystallization events, diversified crystalline phases, strengthened energy for activating the whole crystallization event, and reduced local Avrami exponent. Additionally, the crystallization changed from nucleation stage being as difficult as growth stage to nucleation stage being harder than growth stage after Ga microalloying for Al. Furthermore, both alloys exhibited approximately lessened local activation energy, moderate glass formation ability, and different crystallization characteristics. These results provide new insights for designing novel light RE-based MGs with higher glass formation ability and thermal stability through higher-content similar solute element Ga microalloying for Al.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Xiang Li, Ke Yang, Bing Li, Xin Wang, YanHong Li, XinHui Fan
Summary: The crystallization kinetics of Hf28Be18Ti17Zr17Cu7.5Ni12.5 high-entropy bulk metallic glass (HE-BMG) were investigated using differential scanning calorimetry (DSC) under non-isothermal and isothermal conditions. Three crystallization processes were observed in non-isothermal conditions, with the activation energies of peak crystallization temperatures determined. The dependence of local activation energy on crystallized volume fraction was analyzed using the Kissinger-Akahira-Sunose (KAS) method. The mathematical description of non-isothermal crystallization reaction was achieved using the Sestak-Berggren model. Under isothermal conditions, the incubation time and crystallization time decreased while the crystallization peak increased with increasing annealing temperature. The Avrami indices were all less than 2.5, indicating diffusion-controlled three-dimensional growth with decreasing nucleation rate in the crystallization of the glassy alloy.
THERMOCHIMICA ACTA
(2023)
Article
Thermodynamics
Suman Pawaria, Manju Bala, Harshvardhan Duhan, Nisha Deopa, Sajjan Dahiya, Anil Ohlan, Rajesh Punia, A. S. Maan
Summary: This study investigates the crystallization and glass transition kinetics of a glass system using the non-isothermal method of differential scanning calorimetry. The activation energies for crystallization and glass transition are determined by fitting various theoretical models with experimental data. The thermal stability of the glass compositions is analyzed using several parameters. The study also suggests the occurrence of volume nucleation in the glass system. The glass compositions studied display low fragility.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Tao Xu, Zengyun Jian, Longchao Zhuo, Leilei Zhang, Fange Chang, Man Zhu, Yongqin Liu, Ziqi Jie
Summary: The study systematically researched the crystallization kinetics of a novel metalloid-bearing metallic glass, revealing its higher thermal stability and the variation in crystallization mechanism and activation energy with increasing isothermal crystallization temperature.
THERMOCHIMICA ACTA
(2021)
Article
Materials Science, Multidisciplinary
Xianzhe Zhong, Qingming Zhang, Mingzhen Ma, Jing Xie, Mingze Wu, Yongming Yan, Siyuan Ren, Bowen Liu
Summary: Five novel Ti-and TiZr-based high entropy bulk metallic glasses (HE-BMGs) with good glass forming ability (GFA) were developed, and one of them showed the largest critical diameter of 9 mm. All the developed HE-BMGs exhibited high yield strength and good compressive plasticity at room temperature. One specific alloy showed great potential in the aerospace sector due to its suitable density and high specific strength.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Editorial Material
Thermodynamics
Juergen E. K. Schawe
Summary: A robust procedure for isothermal kinetic evaluation of DSC measurements of polymers is proposed, considering experimental uncertainties. The procedure is applied to the crystallization of different polypropylenes and reveals the presence of homogeneous nucleation at lower temperatures, with diffusion control becoming more prominent at lower temperatures.
THERMOCHIMICA ACTA
(2022)
Article
Thermodynamics
Tao Xu, Xuan Li, Gong Li, Longchao Zhuo, Enhuai Yin, Zengyun Jian
Summary: Substitution of HC30SE for Fe in Cr45Fe11Co7Mo14C15B6Y2 metallic glass improves the crystallization kinetics, promoting the growth process of crystalline phases and increasing the diversity of the crystallized phase. The local Avrami exponent trend for the two metallic glasses is nearly opposite, and non-isothermal crystallization events become more difficult after HC30SE substitution of Cr for Fe.
THERMOCHIMICA ACTA
(2021)
Article
Materials Science, Ceramics
Glauco V. P. Bezerra, Maria V. S. Alencar, Murilo C. Crovace, Alisson M. Rodrigues, Aluisio A. Cabral
Summary: We investigated the crystallization kinetics of two borotitanosilicate glass powders and found that the crystallization process involves multiple-step reactions and a transition from three-dimensional growth to one-dimensional growth.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Metallurgy & Metallurgical Engineering
Tao Xu, Longchao Zhuo, Fange Chang, Yongqin Liu, Ziqi Jie, Zengyun Jian
Summary: In this study, the isothermal crystallization kinetics of Cr-rich metallic glass were investigated, revealing a crystallization mechanism characterized by a reduction in nucleation rate. The exponent n of crystal growth gradually decreases with increasing crystallization temperature. In addition, the local activation energy during the crystallization process increases gradually. The precipitated phases for isothermally crystallized MG were determined to be (Fe,Cr)(23)(C,B)(6) and (Cr2.5Fe4.3Mo0.1)C-3.
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
(2022)
Article
Materials Science, Multidisciplinary
Haimin Zhai, Xuqiang Li, Yongkang Zhang, Wensheng Li, Dongqing He, Bo Cheng, Xinjian Zhang, Zhornik Viktor, Uladzimir Seniuts
Summary: The non-isothermal crystallization behaviors of a detonation sprayed Fe-based amorphous coating (AMC) were investigated using differential scanning calorimetry, X-ray diffraction, and transmission electron microscopy. The crystallization mechanism of the Fe-based AMC was analyzed using the Kissinger-Akahira-Sunose and Ozawa-Flynn-Wall approaches, as well as the local Avrami exponent. The results showed that the crystallization process of the Fe-based AMC was influenced by the non-isothermal heating rate and had excellent thermal stability.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Multidisciplinary Sciences
Yuan Wu, Di Cao, Yilin Yao, Guosheng Zhang, Jinyue Wang, Leqing Liu, Fengshou Li, Huiyang Fan, Xiongjun Liu, Hui Wang, Xianzhen Wang, Huihui Zhu, Suihe Jiang, Paraskevas Kontis, Dierk Raabe, Baptiste Gault, Zhaoping Lu
Summary: By introducing dense local packing regions in BMGs, enhancing structural fluctuations has led to a simultaneous increase in ductility and strength.
NATURE COMMUNICATIONS
(2021)
Article
Engineering, Chemical
Qiang Chi, Liang Chang, Yaqiang Dong, Yiqun Zhang, Bang Zhou, Chengzhong Zhang, Yan Pan, Qiang Li, Jiawei Li, Aina He, Xinmin Wang
Summary: Fe-based amorphous magnetic powder cores with excellent properties were successfully fabricated using a uniform double insulating layer core-shell structure. The hydrothermal oxidation process can control the thickness of the Fe3O4 insulating layer to effectively suppress eddy current loss. FeSiBPC AMPCs exhibit stable magnetic properties and low core loss, making them promising for high-frequency electromagnetic systems.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Jia Guo, Lei Xie, Cong Liu, Qiang Li, Juntao Huo, Chuntao Chang, Hongxiang Li, Xu Ma
Summary: In this study, Fe80-xMxP13C7 (M = Co, Ni; x = 0, 5 and 10 at.%) bulk metallic glasses were prepared, and the effect of Co/Ni substitution for Fe on the magnetocaloric properties was investigated. The findings show that the Curie temperature and magnetic entropy change of the Fe-based BMGs vary with the substitution of Fe by Co/Ni.
Article
Chemistry, Physical
Xiao Liu, Jing Zhou, Jianguo Wang, Chuntao Chang, Zhenzhong Sun, Baoan Sun, Jingbo Liu, Dongxiong Ling, Qiang Li
Summary: A novel Ta46.5W35Co18.5 TFMG with high hardness, elastic modulus, plastic deformation behavior, and corrosion resistance was successfully developed in this study. The excellent properties were attributed to the amorphous structure and unique atomic-scale structure with nanocrystals dispersed in the amorphous matrix, providing a useful guideline for developing TFMG systems with excellent corrosion resistance, high hardness, and good thermal stability.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Min Liu, Liufei Huang, Congcong Ren, Dou Wang, Qiang Li, Jinfeng Li
Summary: Titanium powder with a low cost was successfully prepared into spherical shape using radiofrequency plasma technique, and then used for laser directed energy deposition to produce commercially pure titanium. The spherical Ti powder showed improved mechanical properties due to its optimized shape and removal of residual hydride phase.
Article
Materials Science, Multidisciplinary
Guan Zhang, Wenlei Sun, Lei Xie, Chengwu Zhang, Jie Tan, Xuan Peng, Qiang Li, Xu Ma, Dongmei Zhao, Jiangtong Yu
Summary: In this study, new multicomponent Fe54M5Cr15Mo6Si2B4P10C4 bulk metallic glasses (BMGs) with excellent corrosion and wear resistances were synthesized. The Fe-59 BMG showed the highest corrosion resistance and the lowest wear rate, making it a promising candidate for wear-and corrosion-resistant coating materials.
Article
Materials Science, Multidisciplinary
Haijie Zhang, Fushan Bai, Yaqiang Dong, Lei Xie, Qiang Li, Aina He, Jiawei Li
Summary: In this study, new Ge-containing Fe-based nanocrystalline alloys were developed, and the effects of Ge content on the magnetic and crystallization processes were investigated. The addition of Ge extended the annealing window and produced nanocrystalline alloys with excellent magnetic properties. Non-isothermal crystallization kinetics studies also revealed a decrease in nucleation activation energy with increasing Ge content.
Article
Physics, Applied
Mengqi Gao, Lei Xie, Qiang Li, Juntao Huo, Chuntao Chang
Summary: In this work, high iron content Fe-based amorphous alloys were designed and their Curie temperatures were adjusted to room temperature through the addition of Mo. A new Fe83Mo6Si1B7P2C1 amorphous alloy with room-temperature magnetocaloric effect was successfully prepared, which showed excellent magnetocaloric properties, negligible hysteresis loss, and low material cost.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Shuwei Lu, Lei Xie, Biaobing Cao, Lei Xu, Qiang Li, Haiming Duan, Jun Zhang, Chuntao Chang, Hongxiang Li
Summary: In this study, the effect of Fe substitution with Co on the magnetic properties of Fe80P13C7 amorphous alloy was analyzed using experimental measurements and first-principle molecular dynamic calculations. It was found that the saturation magnetization of Fe80-xCoxP13C7 alloys initially increases and then decreases with increasing Co content, with a maximum value achieved at 5 at.% Co. Fe75Co5P13C7 showed the highest local symmetry and largest exchange splitting energy and saturation magnetization, indicating that Co atoms can induce an increase in the magnetic moment of surrounding Fe atoms.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Materials Science, Ceramics
XiaoJun Cheng, Fang Li, Zhilun Yan, Wenguang Zeng, Jiangjiang Zhang, Ming Zhong, Lirong Yao, Chengwu Zhang, Lei Xie, Qiang Li
Summary: In this study, Fe55-xCo10Zr10W5B20Mox (x = 0, 2 and 4 at.%) bulk metallic glasses (BMGs) were successfully prepared from industrial raw materials. It was found that the alloy with 0 at.% Mo showed excellent thermal stability and corrosion resistance.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Materials Science, Ceramics
Xu Ma, Qiang Li, Lei Xie, Chuntao Chang, Hongxiang Li
Summary: In this study, a series of Co-based bulk metallic glasses were synthesized and their glass forming ability, corrosion properties, mechanical, and magnetic properties were systematically studied. The results showed that these glasses had high corrosion current density and compressive fracture strength, but low saturated magnetization, indicating their potential for industrial applications.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Materials Science, Ceramics
Ranbai Zhang, Chengwu Zhang, Lei Xie, Guan Zhang, Qiang Li, Chuntao Chang, Hongxiang Li, Xu Ma
Summary: In this study, new Fe(20)Co(20)Ni(20)CrxMo(20-x)P(10)B(10) high-entropy bulk metallic glasses were prepared and the effects of Cr/Mo content on thermal stability, mechanical properties, corrosion, and wear resistances were investigated. The results showed that Cr/Mo content affected the glass transition temperature, compressive strength, corrosion resistance, and wear resistance of the materials.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Metallurgy & Metallurgical Engineering
Xueru Fan, Lei Xie, Qiang Li, Chuntao Chang, Hongxiang Li
Summary: This work focused on enhancing the plasticity of Fe25Co25Ni25(Si0.3B0.7)(25) high entropy bulk metallic glass (HE-BMG) by adding minor amounts of Cu. The appropriate addition of Cu significantly improved the plasticity, while excessive Cu addition had a negative effect. The observed alpha-Fe (Co, Ni) clusters in the alloys with 0.3 and 0.6 at.% Cu were responsible for the improved plasticity. However, the plasticity rapidly deteriorated when the Cu content exceeded 0.9 at.% due to the precipitation of alpha-Fe (Co, Ni) and Fe (Co, Ni) B compound grains.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2023)
Article
Chemistry, Physical
Chengwu Zhang, Qiang Li, Lei Xie, Guan Zhang, Baoxia Mu, Chuntao Chang, Hongxiang Li, Xu Ma
Summary: In this study, a series of Fe80-x-yCrxMoyP10C7B3 (x = 0, y = 0; x = 0, y = 4; x = 5, y = 4; x = 15, y = 4; x = 20, y = 4; x = 15, y = 8) bulk metallic glasses (BMGs) were fabricated, and their effects on GFA, thermal stability, mechanical properties, corrosion behavior, and wear performance were investigated. The results showed that the addition of Cr and Mo enhanced the GFA of the Fe-based BMGs. The Fe61Cr15Mo4P10C7B3 BMG exhibited high GFA and excellent corrosion and wear resistance, making it highly promising for engineering applications.
Article
Engineering, Mechanical
A. R. Cui, S. C. Hu, S. Zhang, J. C. Cheng, Q. Li, J. Y. Huang, S. N. Luo
Summary: The spall damage of a coarse-grained CrCoNi MEA with a face-centered-cubic structure is investigated using plate impact experiments and molecular dynamics simulations. The highest spall strength (around 4 GPa) among the MEAs/HEAs ever reported is observed, along with similar or better impact ductility. The dominant damage mode undergoes a transition from intergranular to intragranular damage with increasing impact velocity, consistent with the findings from MD simulations.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
Wei Gao, Yaqiang Dong, Xingjie Jia, Liping Yang, Xubin Li, Shouding Wu, Ronglin Zhao, Hang Wu, Qiang Li, Aina He, Jiawei Li
Summary: Co4Fe2Al1.5Mn1.5 high-entropy alloy with exceptional soft magnetic properties was investigated. It exhibited the highest saturation magnetization strength (161.3 emu g -1) reported for magnetic HEAs, low coercivity (1.9 Oe), high electrical resistivity (173 mu S2 cm), and superior thermal stability up to 600 degrees C. Microstructure of B2 nanoparticles in a DO3 matrix phase and the transition of Mn from antiferromagnetism to ferromagnetism with the assistance of Al contributed to these properties. This study paves the way for the development of soft magnetic HEAs with promising applications.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(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)