Article
Chemistry, Physical
Abdulmuaen Sager, Ismail Esen, Hayrettin Ahlatci, Yunus Turen
Summary: This study investigates the microstructure, mechanical, and wear properties of extruded ZK60 matrix composites strengthened with silicon carbide (SiC) and aluminium nitride (AlN) nanoparticle reinforcements. The results show that increasing the percentage ratios of SiC and AlN in the matrix enhances the compressive strength and hardness of the composites, while reducing the friction coefficient and wear rate.
Article
Materials Science, Multidisciplinary
Ankur Sharma, D. B. Karunakar
Summary: The addition of MgO to ZrB2-SiC composites can reduce sintering temperature, enhance fracture toughness, and improve ablation resistance. Composites containing 2 vol% MgO exhibit the optimal performance in terms of relative density, microhardness, fracture toughness, and ablation resistance.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Materials Science, Ceramics
Branko Matovic, Jelena Maletaskic, Tatiana Prikhna, Vladimir Urbanovich, Vladimir Girman, Maksym Lisnichuk, Bratislav Todorovic, Kutsami Yoshida, Ivana Cvijovic-Alagic
Summary: The study investigated the effect of different B4C and beta-SiC powders ratio on the sintering behavior, relative density, hardness, and thermal conductivity of the composite materials. The results demonstrate that high-pressure sintering is a very effective low-temperature densification method for obtaining additive-free B4C - beta-SiC ceramic composites.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Doaa Shaker Hashem Al-Habib, Zohre Balak, Mehdi Shahedi Asl
Summary: TaC-TiC-SiC composites were successfully fabricated via spark plasma sintering method, and the effects of graphene on microstructure, densification, and hardness were investigated. The results showed that graphene could promote densification and hardness, and prevent grain growth of TiC. The formation of solid solution may also be facilitated in the presence of graphene.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Materials Science, Ceramics
Jeong-Ah Yeom, Eun Seo Kang, Young-Wook Kim, Woo Hyun Nam
Summary: The intrinsic microstructure and crystalline phases of porous SiC ceramics with 5 vol% AlN-RE2O3 (RE = Sc, Y, Lu) additives were characterized. The flexural strength and thermal conductivity of the ceramics were successfully tuned using different additive compositions.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Engineering, Multidisciplinary
Abdulmuaen Sager, Ismail Esen, Hayrettin Ahlatci, Yunus Turen
Summary: This paper investigates the microstructure, mechanical, immersion, and potentiodynamic corrosion behaviors of extruded ZK60 matrix composites reinforced with SiC and AlN particles. The results show that increasing the percentages of SiC and AlN reinforcement elements in the matrix improves corrosion resistance.
ENGINEERING SCIENCE AND TECHNOLOGY-AN INTERNATIONAL JOURNAL-JESTECH
(2023)
Article
Materials Science, Ceramics
R. T. Bhatt, J. I. Eldridge
Summary: This study investigates the effects of thermal treatment on the microstructures, mechanical properties, thermal conductivities, and creep behavior of CVI SiC/SiC composites. The results show that the thermal treatment can affect the stoichiometry and microstructure of the CVI SiC matrix and interface coating, depending on the composition and conditions of the interface coating. Heat treatment in argon with CVI BN interface leads to a decrease in in-plane properties due to weakened interface shear strength, but it significantly improves creep resistance. Modifying the interface composition and heat treatment conditions can prevent the loss of in-plane tensile properties in the composites.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Johnson Frank Guria, Ankit Bansal, Vimal Kumar, B. Venkata Manoj Kumar
Summary: In this study, the effect of simultaneous incorporation of SiC and WC additives on the densification behavior and microstructural development of TiC-based composites was investigated. The results showed that the addition of SiC and WC improved the relative density of the composites and promoted the in-situ formation of Ti3SiC2 compound. In addition, some of the SiC and WC particles were partially dissolved in the (Ti, W) C solid solution, further enhancing the fracture toughness of the composites.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
R. T. Bhatt, F. Sola-Lopez, M. C. Halbig, M. H. Jaskowiak
Summary: The influence of high-temperature argon heat treatment on the microstructure and room-temperature in-plane tensile properties of 2D woven CVI and 2D unidirectional MI SiC/SiC composites with Hi-Nicalon(TM)-S SiC fibers was investigated. Both composites exhibited different degradation behaviors and mechanisms under the heat treatment conditions.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Hai Jiang, Xiao-Yun Huo, Xiao-Hong Wang, Xue-Kai Lan, Wen-Zhong Lu
Summary: The effect of adding YF3 to AlN ceramics was studied. It was found that YF3 can improve the thermal conductivity and reduce the sintering temperature. However, as the YF3 content increases, the thermal conductivity decreases. In addition, the reducing atmosphere affects the phase composition significantly.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Tingbo Wang, Si'an Chen, Zikai Zhao, Qingsong Ma, Weiguo Mao
Summary: By investigating the interfacial microstructure of SiC/SiBCN composites, the formation of SiOC layer was found to have a significant impact on the mechanical properties of the composites. The introduction of SiC coating effectively protected SiC fibers from chemical reactions and weakened the interfacial bonding strength, leading to an increased flexural strength of the composites.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Subodh Kumar, Gajendra Dixit, Savita Dixit
Summary: Greater advantages of employing hybrid reinforced advanced aluminum matrix composites have been highlighted recently. In this study, Al6082 bimodal hybrid composites embedded with different proportions of SiC and TiO2 particles were fabricated using a modified stir-squeeze cast technique. Microstructural analysis revealed that the properties of the composites deteriorated when the content of SiC exceeded 3 wt.%. The incorporation of 3 wt.% SiC and 0.5 wt.% TiO2 resulted in the maximum enhancement of mechanical properties in Al6082 alloy.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Multidisciplinary Sciences
S. Ghadami, E. Taheri-Nassaj, H. R. Baharvandi, F. Ghadami
Summary: The study fabricated HfB2-based composite with SiC reinforcement using pressureless sintering process, which resulted in improved hardness and fracture toughness. The in situ formation of alpha-SiC reinforcement between HfB2 grains contributed to enhancing the relative density and mechanical properties of the composite. Additionally, increasing SiC content led to an enhanced thermal conductivity and reduced electrical conductivity.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Manufacturing
Chunjie Huang, Alexander List, Levke Wiehler, Matthias Schulze, Frank Gartner, Thomas Klassen
Summary: This study focuses on the direct fabrication of graded composites using cold spraying technique and explores the impact of different hard-phase powder sizes on composite formation. The results indicate that well-consolidated microstructures with uniform reinforcement distribution can be achieved with fine hard-phase powder, while coarse hard-phase powder leads to less homogeneous layer build-up.
ADDITIVE MANUFACTURING
(2022)
Article
Materials Science, Multidisciplinary
Shuai Li, Hailiang Wang, Hailong Wang, Kangjing Ouyang, Hongchen Qiu, Bo Song, Yongqiang Chen, Daoyang Han, Gang Shao, Bingbing Fan, Hongxia Lu, Hongliang Xu, Rui Zhang
Summary: In this paper, B4C-ZrB2-SiC composites with excellent mechanical properties were prepared using VHP-RS. The strengthening and toughening mechanism of dislocation were systematically investigated, and it was found that the composites exhibited a classical bow-out process of dislocation line and lamellar dislocation ring as the feature of the Orowan strengthening. The presence of segregated silicon, boron and zirconium at grain boundaries resulted in excellent flexural strength, while the dislocation slips in SiC and ZrB2 grains promoted plastic deformation and improved the fracture toughness of the composites.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Materials Science, Ceramics
Ahmed A. M. El-Amir, Mahmoud Abdelgawad, Shufeng Li, Emad M. M. Ewais, Safaa M. A. El-Gamal
Summary: Cubic-stabilized zirconia ceramic composites were successfully synthesized by conventional sintering, with the effect of MA content and sintering temperature on YSZ properties duly considered. The study showed that MA significantly influenced the stabilization of m-ZrO2, highlighting potentials for developing industrial ceramics for harsh environmental conditions.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2021)
Article
Materials Science, Ceramics
Mahmoud Abdelgawad, Shufeng Li, Emad M. M. Ewais, Safaa M. A. El-Gamal, Xiaodong Hou, Xin Zhang, Deng Pan, Ahmed A. M. El-Amir
Summary: Magnesia-rich spinel (M(2)A)-reinforced yttria-stabilized zirconia (YSZ) ceramic composites have been successfully fabricated using Spark Plasma Sintering (SPS) with waste-derived powders, showing significantly improved densification and stabilization behavior by facilitating the diffusion of Y3+, Mg2+, and Al3+ ions inside zirconia lattice structure.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2021)
Review
Materials Science, Ceramics
Ibrahim M. I. Bayoumi, Emad M. M. Ewais, Ahmed A. M. El-Amir
Summary: This article provides a brief introduction to the rheology of refractory concretes, discussing the variable factors influencing their flowability and their impact on properties. Measurements of rheology using conventional techniques and mathematical models are used to clarify the subject. Insights into the rheology of alumina-silica containing castables are gained through examining submicron and nano sized particles. The rheology of refractory concrete can be properly adjusted according to the application method and specific requirements.
BOLETIN DE LA SOCIEDAD ESPANOLA DE CERAMICA Y VIDRIO
(2022)
Article
Materials Science, Multidisciplinary
Amira M. M. Amin, Yosra M. M. Soliman, S. I. El-Dek, Yasser M. Z. Ahmed, A. H. Zaki
Summary: The study investigated the suitability of recycling industrial wastes into valuable zinc ferrite ceramics. Results showed that ferrites synthesized from pure oxides and mixtures containing wastes exhibited similar physical and magnetic properties.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Ahmed A. M. El-Amir, Mohammed A. A. Attia, M. Newishy, Thomas Fend, Emad M. M. Ewais
Summary: Using waste aluminium dross as a foaming agent, foam glasses with closed-cell porous structure, lightweight, low thermal conductivity, and high CCS can be produced, suitable for sustainable building and industrial energy efficiency applications.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Review
Materials Science, Ceramics
Ahmed A. M. El-Amir, A. A. El-Maddah, Emad M. M. Ewais, Said M. El-Sheikh, Ibrahim M. I. Bayoumi, Y. M. Z. Ahmed
Summary: Sialons are being extensively studied as cost-effective and high-performance alternatives to metal alloys, showing superior properties like high-temperature resistance, mechanical strength, structural reliability, and sinterability. Their crystal structure with two interstitial sites allows for the accommodation of rare earth element activators, leading to promising applications in white light-emitting diodes (wLEDs). This review aims to provide a comprehensive overview of the development and processing of sialons for both structural and luminescent applications, offering valuable insights for engineers and scientists in the field.
JOURNAL OF ASIAN CERAMIC SOCIETIES
(2021)
Article
Materials Science, Ceramics
Dina H. A. Besisa, Emad M. M. Ewais, Hanan H. Mohamed
Summary: This work proposes a new high temperature composite material based on black Al2O3/CuO ceramics, which is produced with a simple and low-cost method. CuO is added to alumina to enhance its sinterability and properties for solar energy absorption. The study includes a detailed investigation of the material processing and evaluation of its phase composition, densification, and microstructural features. Thermal properties and mechanical durability are optimized to ensure the sustainability of the material. The results show that the addition of a small percentage of CuO to Al2O3 significantly enhances its densification, microstructure, thermal and mechanical properties. The composite with 10 wt% CuO exhibits the highest thermal conductivity, best thermal emissivity, lowest thermal expansion, outstanding thermal shock resistance, and mechanical durability. Therefore, Al2O3/CuO composites can be considered as a promising material for high temperature solar receivers.
CERAMICS INTERNATIONAL
(2022)
Article
Multidisciplinary Sciences
Nada H. A. Besisa, Dina H. A. Besisa, Emad M. M. Ewais
Summary: This work focuses on producing high-performance alumina/aluminum titanate composites with high thermal and mechanical properties for high-temperature applications. By adding different contents of rutile to alumina, the researchers were able to enhance the sinterability and thermo-mechanical response of the composites. The addition of rutile not only improved the density and mechanical strength, but also enhanced the thermal properties and stability of the composites.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Ceramics
Ahmed A. M. El-Amir, Mohammed A. A. Attia, Thomas Fend, Emad M. M. Ewais
Summary: This research presents the possibility of producing durable foam glasses with homogeneous microstructure and improved properties using SiC/AlN foaming agent. The foam glass fabricated had a crack-free, 3-D cellular structure with different geometries and exhibited lightweight, high strength, low thermal conductivity, and high gas bubble content. It conforms to international standard for commercial glass foams and has potential applications in sustainable buildings and energy efficiency in industry.
JOURNAL OF THE KOREAN CERAMIC SOCIETY
(2022)
Article
Environmental Sciences
Dina H. A. Besisa, Hanan H. Mohamed, Emad M. M. Ewais, Yasser M. Z. Ahmed, Amira M. M. Amin
Summary: This study introduces new ceramics/glass composites made from industrial lead silicate glass (LSG) wastes. By adding chromia Cr2O3 and hematite Fe2O3 ceramics, the hazardous waste materials are converted into advanced optical materials with improved morphological properties and optical and magnetic behaviors. The results show that the composite with 30% of Cr2O3/Fe2O3 has the highest optical absorbance, the lowest band gap energy, the highest refractive index, and the best magnetic behavior.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Materials Science, Ceramics
Dina H. A. Besisa, Emad M. M. Ewais, Hanan H. Mohamed, Nada Besisa, Essam A. Mohamed
Summary: This paper presents a detailed study of the optical performance and thermal stress durability of black Al2O3/CuO ceramics as solar receiver materials. The results show that adding and increasing the content of CuO can transform alumina into a solar absorber material with high absorptivity in the UV-VIS-NIR spectrum. Thermal stress analysis demonstrates outstanding stress durability and uniform heat distribution in the different ceramics. Therefore, black Al2O3/CuO ceramics can be considered ideal solar absorber materials with high sustainability and durability at high temperatures.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Coatings & Films
Z. Abdel Hamid, Mona H. Gomaa, Soliman I. El-Hout, Emad M. M. Ewais
Summary: The highly active heterogeneous alpha-Fe2O3/Fe3O4@GO composite was incorporated into electroless Ni-P thin film to enhance its performance. The composite was thoroughly characterized and found to have uniform distribution of alpha-Fe2O3/Fe3O4 nanoparticles on GO sheets. The Ni-P/alpha-Fe2O3/Fe3O4@GO composite coatings exhibited improved corrosion resistance in a 3.5% NaCl solution, with maximum resistance achieved at a dosage of 50 mgl-1 of alpha-Fe2O3/Fe3O4@GO nanosheets. SEM images showed that the nanosheets were implanted in the Ni-P matrix and evenly dispersed over the coated surface, while also enhancing the mechanical properties of the thin film.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
I. M. I. Bayoumi, A. A. M. El-Amir, S. A. El-korashy, N. H. Shalaby, E. M. M. Ewais
Summary: In this study, low-cement alumina-zirconia-silica matrices with excellent high-temperature strength were successfully produced using demolished industrial trash from glass melting furnaces. The experimental mixture with an Al2O3/SiO2 ratio of 3 showed the best performance at 1375 degrees Celsius. It can be considered as a potential matrix for synthesizing low-cement refractory castables.
REFRACTORIES AND INDUSTRIAL CERAMICS
(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)
