Article
Materials Science, Ceramics
Naike Shi, Yuzhu Song, Chang Zhou, Longlong Fan, Jun Chen
Summary: Negative thermal expansion (NTE) has been studied in various materials, but only a few materials exhibit giant NTE and there is a lack of methods to improve it. This study achieved a giant NTE in Zn(2-x)CuxP(2)O(7) ceramics through microstructure effect. Dilatometry measurements showed a linear contraction of 0.9% (3.L/L = 2.7%) when heated from 30°C to 125°C, while X-ray diffraction revealed an intrinsic crystallographic volume contraction of only 1.68%. The enhancement of NTE in the ceramic sample was attributed to the shrinkage of voids observed through in-situ atomic force microscope (AFM). This is the first experimental evidence of the microstructure effect on NTE observed by AFM. Microstructure effect is an effective method to achieve giant NTE.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Laura Silvestroni, Antonio Vinci, Nicola Gilli, Luca Zoli, Diletta Sciti, Dietmar Koch, Marius Kuetemeyer
Summary: The reactions between a Zr2Cu melting phase and compounds for ultra-refractory ceramic matrix composites, including SiC, TiB2, and ZrB2, were investigated. The results confirmed the good infiltration capability of the melt. A multiphasic ultra-high temperature ceramic matrix composite was prepared through reactive melt infiltration (RMI) using a TiB2-coated carbon fiber preform infiltrated with Zr2Cu. A second composite was prepared by introducing an additional ZrB2-B infiltration step to reduce the processing temperature and limit fiber damage. The combination of factors on multiple length scales provides synergistic reinforcing phenomena for developing materials for extreme environments.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Andrew Cassidy, Rachel L. James, Anita Dawes, David Field
Summary: By observing the emergence of a Frenkel exciton at 194.4 nm in solid ammonia films deposited at temperatures of 48 K, 50 K, and 52 K, the study traces a polymorphic phase change. The observations over hours provide unprecedented insights into the processes of nucleation and the phase change itself. The findings reveal that the excitonic transition is forbidden in the low-temperature phase but allowed in the high-temperature phase, as the solid state structure undergoes greater flexing, leading to nucleation of nano-crystals approaching 30 unit cells. Additionally, the study identifies activation energies for nucleation and phase change, corresponding to the breaking of two to three hydrogen bonds.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Murat Balci, Haider Al-Jaafer, Mehmet Ari
Summary: The effects of a triple doping strategy on the microstructure and electrical conductivity of Tb-Gd-Sm co-doped Bi2O3 systems were investigated in this study. The results showed that high-temperature conductivity tests could stabilize the cubic d-phase through a secondary annealing effect. Different doping ratios caused phase transitions and order-disorder transitions, resulting in distinct conductivity regions.
CHEMICAL PHYSICS LETTERS
(2022)
Article
Chemistry, Physical
Yukun Huang, Pengxu Chen, Xuanzhao Shu, Jiang Liu, Wei Wang, Biao Fu, Yijun Cao, Weijun Peng, Xiaofeng Zhu, Mingzhen Hu
Summary: This paper investigates the reaction process and formation mechanism of MnCo2O4 using a solid-state reaction method. The stability of MnO2 and Co3O4 in air is confirmed, and Mn2O3 and Mn3O4 are identified as effective reactants for MnCo2O4. The optimal conditions for MnCo2O4 preparation are determined, and the migration behavior of elements in the MnO2-Co3O4 diffusion couple is studied. The formation mechanism of spinel-type MnCo2O4 is explained.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Grigory A. Starkov, Konstantin B. Efetov
Summary: A class of models with the instanton crystal phase is proposed, where the order parameter has an imaginary-time-dependent configuration. An efficient numerical scheme is developed to quantitatively study the model in a broad region of parameters and to prove the existence of the instanton crystal phase. Results from numerical studies show a phase transition between the instanton crystal and a state with an imaginary-time-independent order parameter.
Article
Microscopy
Subramani Supriya
Summary: This article provides an overview of the fabrication methods, crystal structure, and microstructural analysis of bismuth titanates (BTO) materials with doping elements. The excellent properties and doping characteristics of BTO are highlighted, and the measurement of grain size density is discussed. Future perspectives and present industrial applications of BTO are also discussed.
Article
Chemistry, Multidisciplinary
Zhongyang Lv, Xiaolin Pan, Jihao Zhang, Jiannan Pei, Haiyan Yu
Summary: Thermodynamics, kinetics, and transition mechanism of sodium calcium silicate compounds in the low calcium system were systematically studied using XRD, Raman, TG-DSC, and SEM methods. The results indicate that Na2CaSiO4 and Na2Ca2Si2O7 exhibit better thermodynamic stability compared to other sodium calcium silicate compounds at temperatures above 860 degrees C. Different temperatures lead to different phase formation and phase transition reactions.
MATERIALS TODAY CHEMISTRY
(2022)
Article
Physics, Multidisciplinary
Zihan Zhang, Tian Cui, Michael J. Hutcheon, Alice M. Shipley, Hao Song, Mingyang Du, Vladimir Z. Kresin, Defang Duan, Chris J. Pickard, Yansun Yao
Summary: Hydrogen-based superconductors offer a way to achieve room-temperature superconductivity, but their immediate application is limited by the high pressures required. This study proposes a strategy for designing high-temperature superconductors at low pressures by alloying small-radius elements and hydrogen to form ternary H-based superconductors with alloy backbones.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Ceramics
Di Zhang, Yingtao Su, Guangxun Li, Zhihong Guo, Huilan Sun, Bo Wang, Liguang Zhu
Summary: Sodium doping has a significant impact on the mineral transformation and crystalline degree of calcium sulpho-aluminate, ultimately affecting its pulverization and alumina leaching property. However, excessive sodium dopant can lower the melting temperature and hinder the phase transformation process, leading to a decrease in pulverization performance.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Applied
Patricia A. A. M. Vaz, Joao Rocha, Artur M. S. Silva, Samuel Guieu
Summary: Complexes of difluoroborates based on 2'-hydroxyphenones have been synthesized, showing fluorescence emission in the visible region in both solution and solid state. Interestingly, these new dyes have higher quantum yields in the solid state than in solution, with the enhanced emission rationalized by the crystal structure of the dyes.
Article
Physics, Condensed Matter
G. Soniya Pauline, S. Kaleemulla
Summary: This study focuses on the synthesis of titanium doped zinc oxide nanoparticles using solid state reaction and vacuum annealing. The effects of titanium on the physical, optical, surface, spectroscopic, elemental, and electrical properties of the nanoparticles were investigated using various characterization techniques.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Materials Science, Multidisciplinary
Mingrui Yang, Junyi Xiang, Chenguang Bai, Xuangeng Zhou, Zhongci Liu, Xuewei Lv
Summary: The solid-state reaction and diffusion behaviors of CaFe2O4 and TiO2 were studied using a diffusion couple method, revealing the formation of a three-layer diffusion interface.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Tom Ichibha, Yunwei Zhang, Kenta Hongo, Ryo Maezono, Fernando A. Reboredo
Summary: The research team explored possible hydrogen structures under high pressure conditions, and discovered the P21/c-8 structure through methods such as structural search and simulations. This structure was found to be most stable at 400 and 500 GPa, and qualitatively reproduced the infrared spectrum peaks observed in the H2-PRE phase.
Article
Materials Science, Ceramics
Sadaf Batool, Zakir Hussain, Usman Liaqat, Manzar Sohail
Summary: This study reports a facile synthesis method for bone whitlockite using a solid-state reaction. Characterization analysis confirmed the presence of whitlockite crystalline phase and characteristic peak of bone whitlockite in the synthesized material. The synthesized particles have an appropriate size and are stable within a certain temperature range.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Jiannan Pei, Xiaolin Pan, Dezhuang Xu, Caiwei Zhang, Haiyan Yu, Ganfeng Tu
Summary: In this study, the formation thermodynamics, phase transition and stability of sodium calcium silicate compounds were investigated under different calcination parameters. The results show that increasing the calcination temperature and holding time can promote the crystal stability of the sodium calcium silicate compounds.
CERAMICS INTERNATIONAL
(2022)
Article
Metallurgy & Metallurgical Engineering
Pan Xiao-lin, Lv Zhong-yang, Zhang Can, Yu Hai-yan
Summary: This study investigated the phase transition, morphology, stability, and pulverization performance of dicalcium silicate (C2S) with different Na2O additions during high-temperature sintering. The results showed that the addition of Na2O affected the transition of C2S, crystallinity, grain size, and content of the amorphous phase. It also decreased the stability of the sintered products in alkali solution.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2022)
Article
Materials Science, Ceramics
Zhongyang Lv, Xiaolin Pan, Jiannan Pei, Dezhuang Xu, Haiyan Yu
Summary: A hydrothermal process was proposed to prepare lightweight calcium silicate powder from red mud, which could realize the complete and high-value utilization of red mud. The hydrothermal process could improve the physical properties of the calcium silicate powder.
CERAMICS INTERNATIONAL
(2022)
Article
Construction & Building Technology
Jiannan Pei, Xiaolin Pan, Yafei Qi, Haiyan Yu, Ganfeng Tu
Summary: This study proposes a novel and green process to prepare ultra-lightweight ceramsite using non-expanded clay and waste sawdust as raw materials. The physical properties and phase transition mechanism of the ultra-lightweight ceramsite were investigated under different raw material formulas and sintering parameters. The synergistic effects of sawdust and Fe2O3 have a significant influence on the expansion properties of the ceramsite.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Chemical
Yu Li, Xiaolin Pan, Zhongyang Lv, Hongfei Wu, Haiyan Yu
Summary: In this paper, a novel zero-waste process was proposed to comprehensively utilize high-silicon bauxite, and the phase transition mechanism and leaching properties were studied. The optimal roasting conditions for atmospheric-pressure leaching and high-pressure leaching were determined.
MINERALS ENGINEERING
(2022)
Article
Engineering, Chemical
Mengyuan Gao, Mei Ji, Yanping He, Xiaolin Pan, Yun Wang, Tian Si, Yanlin Sun
Summary: Essential oil microcapsules with viscous cores were formulated by encapsulating oil droplets with intermediate non-crosslinked polymer shells and crosslinked polymer outer shells. The release profile, mechanical strength, and adsorption performance of the microcapsules were compared to melamine-formaldehyde microcapsules. The viscous core microcapsules showed better heat resistance, long-lasting release, viscoelasticity, and adhesion to fabrics, making them more consumer-friendly than melamine-formaldehyde microcapsules.
Article
Chemistry, Multidisciplinary
Zhongyang Lv, Xiaolin Pan, Jihao Zhang, Jiannan Pei, Haiyan Yu
Summary: Thermodynamics, kinetics, and transition mechanism of sodium calcium silicate compounds in the low calcium system were systematically studied using XRD, Raman, TG-DSC, and SEM methods. The results indicate that Na2CaSiO4 and Na2Ca2Si2O7 exhibit better thermodynamic stability compared to other sodium calcium silicate compounds at temperatures above 860 degrees C. Different temperatures lead to different phase formation and phase transition reactions.
MATERIALS TODAY CHEMISTRY
(2022)
Article
Materials Science, Paper & Wood
Yun Wang, Mengyuan Gao, Xiaolin Pan, Yanping He, Yuyang Liu, Mei Ji, Tian Si, Yanlin Sun
Summary: Resveratrol (Res) is loaded on the biodegradable ethyl cellulose (EC) carrier to prepare highly porous EC/Res microspheres for sustained release and degradation analysis. The experimental results show that the batch-process yielded EC/Res microspheres with a yield of 80.70 wt% and an encapsulation efficiency of 73.89% under specific conditions. Continuous production yielded EC/Res microspheres with a higher encapsulation efficiency of 90.63% and a yield of 85.58 wt%. The EC/Res microspheres achieved a cumulative release rate of 91.97 wt% in a phosphate buffer solution (pH=5.0) at 45℃ for 120 h.
Article
Materials Science, Ceramics
Jiannan Pei, Xiaolin Pan, Yibo Wang, Zhongyang Lv, Haiyan Yu, Ganfeng Tu
Summary: The effects of Na2O and CaO on the physical properties, crystalline phases, and microstructure of red mud based ultra-lightweight ceramsite (RUC) were investigated. Na2O and CaO promote the formation of glass phase and reduce the viscosity of the liquid phase. The presence of Na2O accelerates the formation of large size pores and expansion of RUC, while excessive Na2O leads to the growth and connection of pores, reducing the compressive strength. CaO produces a fluid glass phase that can fill the internal pores, reducing expansion and water absorption. High contents of Na2O and CaO accelerate the crystallization of nepheline and anorthite, respectively, contributing to the strength improvement of RUC. A content of 3% for Na2O and 3.5% for CaO in RUC result in a bulk density of 365-485 kg/cm3 and a compressive strength of 1.05-1.53 MPa, meeting the requirement of GB/T 17431.2-2010.
CERAMICS INTERNATIONAL
(2023)
Article
Environmental Sciences
Xiaolin Pan
Summary: China and South Korea have attempted to resolve their fishery disputes in the Yellow Sea through political negotiations, but the results of their bilateral treaties have been limited. This article suggests that the compulsory conciliation procedure provided by the Law of the Sea can serve as an alternative for settling fishery disputes. By comparing fishery disputes in the Yellow Sea, the article argues that compulsory conciliation is applicable in this context. The article also addresses important issues regarding the jurisdiction and powers of the Conciliation Commission, as well as the implementation of its reports.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Materials Science, Ceramics
Jingjing Guo, Hao Cui, Manmen Liu, Jialin Chen, Ming Wen, Chuanjun Wang, Wei Wang, Song Li, Xudong Sun, Xiaolin Pan, Shaohong Liu
Summary: Large quantities of red mud tailings have negative impacts on the environment and public health. However, they can be utilized in an eco-friendly way to create valuable glass and glass-ceramics. Through studying crystallization, phase transition, microstructure evolution, and performance, it was found that glass-ceramics made from red mud tailings have superior properties and can be used for construction applications.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Environmental
Zhiduan Cai, Wenjun Luo, Haoquan Zhuang, Congling Ren, Xiaolin Pan, Yuyu Xu, Haoran Wang, Xiezhao Li, Yaoji Yuan, Rui Zhu, Xiangyu Zhan, Lin Jin, Guibin Xu
Summary: This study developed a novel pirfenidone sustained-release stent tube using a double layers drug release system. The stent tube demonstrated significant inhibitory effects on human ureteral smooth muscle cells, macrophages, and inflammatory factors, both in vitro and in vivo. The results suggest that this stent tube could effectively prevent the formation and progression of ureteral stenosis.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Metallurgy & Metallurgical Engineering
Chen Wei, Xiao-lin Pan, Jian-nan Pei, Zhong-yang Lyu, Hai-yan Yu
Summary: The unfired lightweight bricks were prepared using dealkalized calcium silicate residue, cement, and sand, and their physical properties and phase transition were investigated. It was found that increasing the content of calcium silicate residue improves the compressive strength but reduces bulk density, while excessive residue reduces strength and increases water absorption. The optimal range for the brick's properties is achieved with a calcium silicate residue content of 50%-70%. The bricks gain strength through the flocculation of raw material particles by calcium silicate hydrate (C-S-H) and calcium aluminate hydrate (C-A-H) gels during the curing process. The bricks are environmentally harmless according to leaching tests on heavy metals and sodium ions.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2023)
Article
Nanoscience & Nanotechnology
Yiqiao Huang, Yun-Yi Mao, Guohao Zeng, Huimin You, Dehui Lai, Jun Bian, Jiahui Chen, Shuo Zhao, Congling Ren, Xiaolin Pan, Xue Liang, Weimin Dong, Zhiming Zhang, Lin Jin, Xianhan Jiang
Summary: Bladder tumor is the most common tumor in urology. Traditional tumor resection therapy has limitations such as deep incisions and complications. Therefore, a composite nanofibers-drug release system (CNFs-DRS) was designed to replace and simplify bladder chemical drug perfusion, effectively killing residual tumor cells and supporting wound healing.
JOURNAL OF BIOMEDICAL NANOTECHNOLOGY
(2023)
Article
Engineering, Environmental
Jiannan Pei, Xiaolin Pan, Yafei Qi, Haiyan Yu, Ganfeng Tu
Summary: The sintering behavior and physical properties of ultra-lightweight ceramsite using red mud and waste sawdust were investigated. The results showed that red mud is a suitable material for producing ultra-lightweight ceramsite, and the introduction of waste sawdust enhances the expansion process. The bulk density of the ceramsite decreases first and then increases with the increase of red mud and sawdust content.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
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)
