Article
Chemistry, Physical
Manish Badole, Hari Narayanan Vasavan, Samriddhi Saxena, Asish Kumar Das, Velaga Srihari, Sunil Kumar
Summary: The effects of La3+ and Al3+ substitution on the structural, dielectric, and piezo-electric properties of (1-x)(K0.5Bi0.5)TiO3-xLaAlO3 ceramics were investigated. With the increase in LAO content, a decrement in tetragonal distortion and an increase in cubic symmetry were observed. The incorporation of LAO in KBT resulted in an improved relaxor behavior and a suppression of oxygen vacancies. The piezo-electric properties were enhanced, with the 3% LAO-doped sample exhibiting the highest piezo-electric charge coefficient and improved piezo-electric voltage coefficient. An energy harvesting experiment was performed on the poled 3% LAO-doped ceramic, showing promising results under normal finger tapping.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
B. Srimathy, J. Kumar
Summary: Rare-earth Nd-doped lead zinc niobate-lead titanate (Nd:PZN-PT) and W-doped lead zinc niobate-lead titanate (W:PZN-PT) single crystals were grown by self-flux technique, with pure perovskite phases observed. The doped crystals showed enhanced relaxor behavior, as evidenced by diffuse phase transitions and frequency dispersive phenomena in the dielectric peaks. Additionally, doping had a significant impact on the dielectric constant, AC conductivity, and piezoelectric properties of the crystals, with a simple domain switching mechanism observed in the hysteresis behavior.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Zaka Ullah, Javed Rehman, Faheem Ur Rehman, Shagufta Gulbadan, Muhammad Adil Mahmood, Muhammad Azhar Khan
Summary: Perovskite type Ba1-xSrxZr0.2Ti0.8O3 ceramics were synthesized using a conventional solid-state reaction method, and their structure and properties were characterized. The results showed that the Ba1-xSrxTi0.8Zr0.2O3 composition does not transform from normal ferroelectric to relaxor ferroelectric in the current range. Diffusivity increases with increasing Sr concentration, while the transition temperature decreases.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Jiaming Li, Enwei Sun, Yaping Ma, Huashan Zheng, Hua Zhao, Zhiguo Zhang
Summary: This study proposes a method to quantitatively characterize the phase transition processes of ferroelectric materials using fluorescence wavelength shift, demonstrating exact consistency between changes in fluorescence peak positions and structural phase transitions. The contactless, non-destructive fluorescence method provides localized quantitative analysis for phase transition processes in ferroelectric materials. The method based on fluorescence peak wavelength dependence on crystal environment may potentially be applied to characterize phase transitions in other ferroelectric materials.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Ceramics
Amine Bendahhou, Karim Chourti, Soufian El Barkany, Mohamed Abou-Salama
Summary: Ba-4(Nd1-xSmx)(28/3)(Ti0,95Zr0,05)(18)O-54 ceramics with varying Nd/Sm ratio were studied for their structure and dielectric behavior. The crystal structure was found to belong to the tungsten bronze type, with dense microstructure and significant temperature-dependent dielectric properties.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
R. G. F. Dornelas, A. C. Silva, J. E. Garcia, J. D. S. Guerra
Summary: The demand for clean energy has been increasing due to climate changes, necessitating the implementation of new and alternative energy sources. Lead-free ferroelectric systems based on BaTiO3 (BT) have been synthesized and studied for their physical properties, with a focus on the doping element Sn4+ and its effect on the structural and dielectric properties, as well as phase transition characteristics.
Article
Crystallography
Shinobu Aoyagi, Ayumi Aoyagi, Hiroaki Takeda, Hitoshi Osawa, Kazushi Sumitani, Yasuhiko Imai, Shigeru Kimura
Summary: Lead-containing relaxor ferroelectrics exhibit significant piezoelectric capabilities due to their heterogeneous structures. Time-resolved nanobeam X-ray diffraction reveals the local lattice strain and Bragg intensity distributions under an alternating electric field, demonstrating the presence of nanodomains with different responses within the measured local area. The dynamic motion of nanodomains in the heterogeneous structure enables large piezoelectric lattice strain and fatigue-free ferroelectric polarization switching.
Article
Chemistry, Physical
Khalid Mujasam Batoo, Ritesh Verma, Ankush Chauhan, Rajesh Kumar, Muhammad Hadi, Omar M. Aldossary, Y. Al-Douri
Summary: This study reported the synthesis of Gd and Nb co-doped BT ceramic oxides and investigated their structural and electrical properties. Various analysis techniques were used to characterize the samples, revealing the influence of Gd and Nb doping on the electrical properties of the ceramic materials, which were found to improve with increasing dopant concentration.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Polymer Science
Aleksandra Radko, Sebastian Lalik, Aleksandra Deptuch, Teresa Jaworska-Golab, Robert Ekiert, Natalia Gorska, Katarzyna Makyla-Juzak, Jacek Niziol, Monika Marzec
Summary: The study investigated DNA complexes with different surfactants using Fourier transform middle infrared spectroscopy, X-ray diffraction and dielectric spectroscopy methods, confirming electrostatic interactions in complex formation. A packing model for the complex molecules, depending on the type of surfactant, was proposed based on SAXS results. The dielectric process in low frequency range was interpreted as oscillation of surfactant ions, similar to ions in pure DNA solutions.
Article
Materials Science, Multidisciplinary
Ankur Sharma, Indranil Bhaumik, Gurvinderjit Singh, V. S. Tiwari, A. K. Karnal
Summary: The correlation between depolarization temperature, ergodicity, and piezoelectricity of niobium-substituted (Na0.41K0.09Bi0.50)TiO3 has been investigated. The dielectric measurements show a significant reduction in depolarization temperature and critical transition temperatures with increasing niobium content. The piezoelectric coefficients increase reasonably for compositions with niobium content less than 0.5 mol%, but decrease significantly for more niobium content than 1.0 mol%.
JOURNAL OF MATERIALS RESEARCH
(2021)
Article
Chemistry, Physical
Cilaveni Goutham, Kinjarapu Venkata Ashok Kumar, Sai Santosh Kumar Raavi, Challapalli Subrahmanyam, Saket Asthana
Summary: This paper focuses on the analysis of the microstructure phase of titanium dioxide (TiO2) precursor in sodium bismuth titanate (Na0.5Bi0.5TiO3, NBT) ceramics and compares the effects of anatase and rutile TiO2 on the grain size, microstructure, crystal structure, and electrical properties of NBT ceramics. The results show that NBT ceramics prepared with anatase TiO2 exhibit superior dielectric and ferro/piezoelectric properties, as well as additional photocatalytic functionality.
JOURNAL OF MATERIOMICS
(2022)
Article
Chemistry, Inorganic & Nuclear
Najah Rhimi, N. Dhahri, M. Khelifi, E. K. Hlil, J. Dhahri
Summary: This work focuses on studying the properties of sodium bismuth titanate (NBT) ceramic, including its structure, optical properties, and electrical properties. The material exhibited a poly-crystalline structure with a rhombohedral shape, and a grain size of 29.17 μm. The dielectric loss and dielectric constant increased with frequency, and the conduction mechanism followed the correlated barrier hopping (CBH) and small polaron hopping (SPH) models. The study provides valuable insights into the physical characteristics of NBT and its potential applications in the industry.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Materials Science, Ceramics
Fatima Chaou, Amine Bendahhou, Karim Chourti, Ilyas Jalafi, El Hassan Yahakoub, Soufian El Barkany, Mohamed Abou-Salama
Summary: This paper experimentally investigates the structural, microstructural, dielectric, and conductivity properties of Tin modified Sodium Bismuth Titanate (Na0.5Bi0.5)(Ti1-xSnx)O3. Xray diffraction confirms the presence of a rhombohedral phase in all compositions at room temperature. The addition of Sn4+ reduces the dielectric loss and significantly improves electrical conductivity. These findings suggest that doped materials can be applied to solid oxide fuel cells.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Electrical & Electronic
Maximilian Lederer, Pratik Bagul, David Lehninger, Konstantin Mertens, Andre Reck, Ricardo Olivo, Thomas Kampfe, Konrad Seidel, Lukas M. Eng
Summary: The study shows that the properties of hafnium oxide films are greatly affected by the crystallization process, with annealing temperature playing a significant role in influencing the crystallographic properties and microstructure, thereby impacting the ferroelectric properties.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Materials Science, Biomaterials
Subingya Pandey, Apurba Das, L. Gayatri Sharma, Lalit M. Pandey, Pamu Dobbidi
Summary: This study investigates the relationship between the structural, electrical, biological, and optical behavior of Ca-10(PO4)(6)(OH)(2) (HAP)-K0.5Na0.5NbO3 (KNN) bioceramic composites. The results show that the composites have good electrical polarization, protein adsorption capacity, and fluorescence activity, making them potentially useful in biomedical applications.
ACS BIOMATERIALS SCIENCE & ENGINEERING
(2023)
Article
Physics, Condensed Matter
Qingyang Fan, Shuaiming Chen, Yingbo Zhao, Xinhai Yu, Sining Yun
Summary: The structure, stability, electronic, and mechanical properties of a novel carbon material called tower carbon were studied using density functional theory. The results showed that tower carbon has a stable cubic crystal structure, metallic properties, and low anisotropy.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Review
Engineering, Environmental
Taimoor Raza, Jingjing Yang, Ruoming Wang, Chen Xia, Rizwan Raza, Bin Zhu, Sining Yun
Summary: This paper presents a mini review on the recent development of single component solid oxide fuel cells (SOFCs), which have the potential to overcome the limitations of high operating temperatures. Unlike conventional three-component SOFCs, single component SOFCs feature a homogeneous layer with hybrid dual ions conduction based on semiconductor-ion hetero-structure materials. The research focuses on the interfacial properties and mechanisms of semiconducting-ionic materials and the transition from non-functional to functional materials with potential for dual ions conduction. The potential of this new device is evaluated and compared to conventional SOFCs, highlighting its promising future prospects.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Qingyang Fan, Ruida Zhao, Runling Yang, Wei Zhang, Xinhai Yu, Sining Yun
Summary: Three new Group IV element allotropes Fmmm C-72, Si-72, and Ge-72 are proposed in this study, each demonstrating mechanical, dynamical, and thermodynamic stability with different properties such as elastic anisotropy, conductivity, and light absorption capacity. These allotropes have potential applications in various engineering fields due to their unique characteristics.
COMPUTATIONAL MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Qingyang Fan, Heng Liu, Yingbo Zhao, Xinhai Yu, Sining Yun
Summary: This study designs three metallic carbon materials through calculations and analysis, which possess favorable physical characteristics and exhibit electrical conductivity in specific directions.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Chemistry, Physical
Yinhao Wang, Sining Yun, Jing Shi, Yongwei Zhang, Jiaoe Dang, Changwei Dang, Zhuolei Liu, Yingying Deng, Tianxiang Yang
Summary: This study successfully synthesized a metal and nonmetal co-doped biphasic tungsten-based chalcogenide heterostructured catalyst with rich defects, which significantly enhances the electrocatalytic performance in hydrogen evolution and triiodide reduction reactions. Additionally, the catalyst shows competitive power conversion efficiency in solar cells.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Yongwei Zhang, Sining Yun, Jiaoe Dang, Changwei Dang, Guangping Yang, Yinhao Wang, Zhuolei Liu, Yingying Deng
Summary: By doping nonmetal atoms and modifying the structure and electronic structure of the catalyst, the catalytic activity of the catalyst was improved. Nitrogen, boron, and phosphorus/sulfur co-doped carbon catalysts demonstrated improved catalytic performance and excellent performance and stability in photovoltaic devices and alkaline hydrogen evolution reactions. This study presents a promising strategy for designing multivariate-doped non-metal catalysts for new energy applications.
MATERIALS TODAY PHYSICS
(2022)
Article
Engineering, Environmental
Jiaoe Dang, Sining Yun, Yongwei Zhang, Jingjing Yang, Zhuolei Liu, Changwei Dang, Yinhao Wang, Yingying Deng
Summary: In this study, a novel double-shell N-C-in-Co/N-C electrocatalyst was constructed using core-shell MOF precursors, significantly enhancing its activity in the hydrogen evolution reaction and triiodide reduction reaction. The experimental results demonstrate that this electrocatalyst exhibits excellent performance in alkaline electrolyte and achieves higher efficiency as a counter electrode in solar cells.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Jiaoe Dang, Sining Yun, Yongwei Zhang, Guangping Yang, Jingjing Yang, Dan Qiao, Tianxiang Yang
Summary: This study presents a strategy based on the ZIF template to fabricate hierarchical nanostructures of sulfide embedded in nitrogen-doped carbon. The resulting nanostructures exhibit excellent electrocatalytic activity and stability for hydrogen evolution reaction and triiodide reduction reaction. The research findings are of great significance for developing efficient catalysts in energy conversion systems.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Review
Chemistry, Multidisciplinary
Bo Li, Ting Shen, Sining Yun
Summary: Controlling the crystallographic orientation of semiconductor crystals is crucial for adjusting their facet-dependent properties. Preferential crystal orientation in perovskite thin films improves their optoelectronic properties and enhances the efficiency of perovskite solar cells. However, the impact of crystallographic orientation on the photovoltaic performance of perovskite thin films in PSCs is not well understood.
MATERIALS HORIZONS
(2023)
Article
Engineering, Environmental
Lijianan Liu, Sining Yun, Kaijun Wang, Teng Ke, Jiayu Liu, Yangyang Gao, Xiaoxue Zhang
Summary: This study explores the facilitation of carbon quantum dots (CQDs) immobilized in porous carbon (PC) as a host-guest accelerant in anaerobic co-digestion (AcoD). The results show that the addition of CQDs and PC significantly improves biogas yield and TCOD removal efficiency. This approach has the potential to improve the performance of anaerobic digestion and enhance the thermal stability of digestates by enriching microbial communities.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Qingyang Fan, Ruida Zhao, Yingbo Zhao, Yanxing Song, Sining Yun
Summary: In this study, eight BN polymorphs (2H, 4H, 5H, 6H-I, 6H-II, 7H-I, 7H-II, and 7H-III) were obtained using a random sampling strategy, and their similarities to 3C BN in stacking order were observed. The calculations showed that these polymorphs have high stability and thermal stability. Additionally, they exhibit superhard characteristics and can be considered as promising ultrawide-bandgap semiconductors.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Green & Sustainable Science & Technology
M. A. K. Yousaf Shah, Yuzheng Lu, Naveed Mushtaq, Muhammad Yousaf, Nabeela Akbar, Chen Xia, Sining Yun, Bin Zhu
Summary: This article introduces the importance of sustainable energy production technologies in energy transition and the role of fuel cells in this transition. Solid oxide fuel cells are a cost-effective and practical choice, but their commercialization is limited by high costs. Low-temperature solid oxide fuel cells have been slow to progress due to a lack of electrolyte materials. This article presents progress on new functional semiconductor-ionic materials and semiconductor membranes, and discusses their significance, limitations, challenges, and future prospects in developing advanced solid oxide fuel cells.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2023)
Article
Chemistry, Physical
Tianxiang Yang, Sining Yun, Chen Wang, Yongwei Zhang, Jiaoe Dang, Guangping Yang, Zan Gao, Dan Qiao, Mengmeng Zhang
Summary: This study synthesized 3D-BPC loaded 0D niobium-based bimetallic oxide nanohybrids using a hierarchical strategy. The catalysts exhibited enhanced catalytic reduction ability and promising stability in dye-sensitized solar cells, achieving efficiencies comparable to that of platinum in certain systems. This work provides guidance for constructing cost-effective and efficient nanohybrid catalysts for new energy conversion devices.
MATERIALS TODAY ENERGY
(2023)
Article
Materials Science, Ceramics
Qingtao Shen, Chunli Yang, Weiji Cao, Jun Li, Lei Wang, Wei Yao, Yanru Liang, Kai Wang, Sining Yun
Summary: This study investigated the electrochemical properties of La2Ce2O7 materials with Mg doping. The results showed that La2xMgxCe2O7-delta sample with x = 0.15 exhibited the highest conductivity and hydrogen permeation flux. The hydrogen permeation mechanism was influenced by the thickness of the membrane, with surface diffusion controlling the process in thin membranes and bulk diffusion in thick membranes. Surface modification with Pt and Ni improved the hydrogen permeability of the membrane. The Ni-La2-xMgxCe2O7-delta membranes with different Mg contents showed good stability in a humid atmosphere with 20% CO2.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Wang Zhi-Guo, Deng Ying-Ying, Dang Jiao-E, Zhang Yong-Wei, Zhang Li-Shan, A. Xin, Yun Si-Ning
Summary: Cu-modified nitrogen-doped carbon and Fe/Cu-modified nitrogen-doped carbon with carbon nanotube catalysts were prepared and their electrochemical properties and photovoltaic performance were studied in dye-sensitized solar cells. The Fe/Cu-N-C/CNT catalyst showed higher graphitization degree, better electrochemical stability, and higher power conversion efficiency compared to Cu-N-C.
CHINESE JOURNAL OF INORGANIC CHEMISTRY
(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)
