Article
Chemistry, Physical
Yuhao Wang, Yu-Jun Jin, Zhao-Ying Ding, Gui Cao, Zhan-Guo Liu, Tao Wei, Jia-Hu Ouyang, Ya-Ming Wang, Yu-Jin Wang
Summary: A series of new high-entropy rare-earth zirconates were synthesized using a solid-state reaction method, and their crystal structure, microstructure, and electrical properties were studied. The high-entropy rare-earth zirconates exhibited a single-phase pyrochlore structure with high relative density and fine grain sizes. Among them, (Nd0.2Sm0.2Eu0.2Gd0.2Dy0.2)(2)Zr2O7 showed excellent electrical conductivity at 1073K.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Anastasia V. Egorova, Ksenia G. Belova, Irina E. Animitsa
Summary: The LaIn1-xZnxO3-1/2x samples were synthesized for the first time via solid-state reaction method. The effect of Zn2+ doping on the structure, water uptake and electrical properties of LaInO3 was investigated. The results show that Zn2+ is a good alternative to alkaline earth metals and improves the conductivity of the ceramics. The phase exhibits oxygen-ionic transport at temperatures below 500°C and protonic transport at temperatures below 600°C.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Claudio Cazorla, Massimiliano Stengel, Jorge Iniguez, Riccardo Rurali
Summary: We predict a significant variation in heat conductivity in SrMnO3 thin films near room temperature by applying small electric and/or magnetic fields based on first-principles simulations. This is caused by a phase transition that involves large changes in both magnetization and electric polarization, resulting in a relative heat conductivity variation of about 100%. These findings are attributed to the anharmonic spin-phonon couplings that strongly influence the mean lifetime of phonons.
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Zaixin Wei, Zhongyang Wang, Ciqun Xu, Guohua Fan, Xiaoting Song, Yao Liu, Runhua Fan
Summary: This study achieved temperature-stable negative permittivity in the kHz region by preparing specific ceramic materials and elaborated on the underlying mechanisms. The zero-crossing behavior of the real permittivity observed in the sample provides a promising alternative for designing epsilon-near-zero materials.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
George F. Harrington, Sunho Kim, Kazunari Sasaki, Harry L. Tuller, Steffen Grieshammer
Summary: This study investigates how ionic transport in functional oxides is influenced by strain, particularly focusing on rare-earth substituted ceria epitaxial films under biaxial strain. The research shows that the out-of-plane transport is more sensitive to strain than in-plane transport, and the size of rare-earth substitutionals significantly impacts the strain effect on ionic conductivity. By simulating conductivity using the kinetic Monte Carlo method based on density functional theory, the study reveals that both migration barriers and defect interactions contribute to the strain-modified transport.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Chemistry, Multidisciplinary
Henri Joel Mbah Ngantchou, Rizwan Raza, Edwin Akongnwi Nforna, John Lambi Ngolui, Tauqir A. Sherazi
Summary: Transition metal doped apatite La10Si6-xCoxO27-delta and La10Si5.2Co0.4Ni0.4O27-delta were synthesized by co-precipitation method followed by sintering. The conductivity of the samples increased with the content of Co2+ doping and was further increased by co-doping of Ni2+. The co-doped sample (La10Si5.2Co0.4Ni0.4O27-delta) exhibited the highest conductivity and achieved the maximum power density, making it a potential electrolyte candidate for solid oxide fuel cell application.
Article
Engineering, Electrical & Electronic
S. Behera, B. N. Parida, R. K. Parida, R. Padhee
Summary: The eco-friendly polycrystalline sample Mg2LaVO6 was synthesized using the solid state reaction technique. By optimizing the calcination temperature, a single phase new compound was obtained. The sample shows potential applications in multilayer capacitors and micro-electronics, as well as useful thermistor devices.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Daniel Stasko, Kristina Vlaskova, Petr Proschek, Milan Klicpera
Summary: The A2Ir2O7 pyrochlores with rare-earth element A have complex magnetic and conductive properties, and previous studies have mainly focused on the light A members of the series. This study reports on the electrical resistivity and magnetoresistance of heavy-rare-earth iridates (A = Dy - Lu), including the newly synthesized Tm2Ir2O7 member. The measurements reveal a transition from a semimetal/semiconductor to an insulating state within the series, accompanied by a continuous broadening of the anomaly in electrical resistivity from Dy to Lu. The investigated iridates become insulating due to an opening of a gap at the Fermi level induced by antiferromagnetic ordering, and a negative magnetoresistance is observed for all members of the series.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Chemistry, Physical
Yong Youn, Basharat Hussain, Abid Ullah, In Jun Hwang, Jiweon Shin, Jong-Eun Hong, Dong Woo Joh, Seung-Bok Lee, Rak-Hyun Song, Seok-Joo Park, Tae Woo Kim, Yoonseok Choi, Tak-Hyoung Lim, Hye-Sung Kim
Summary: Hexagonal perovskite-related oxides have attracted significant attention for their potential applications in electrochemical devices. This study reveals the anisotropic characteristics of proton conduction behavior in a Ba5Er2Al2ZrO13 (BEAZ) hexagonal perovskite electrolyte-supported cell. By controlling the orientation of the grains in the BEAZ thin film, the researchers demonstrate that proton migration is more favorable in the lateral direction than in the vertical direction. Density functional theory calculations and ab initio molecular dynamics simulations suggest that anisotropic proton migration is preferred through the perovskite-like layer.
CHEMISTRY OF MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Haifan Li, Fanqi Meng, Yi Bian, Xuanchi Zhou, Jiaou Wang, Xiaoguang Xu, Yong Jiang, Nuofu Chen, Jikun Chen
Summary: Although the metal to insulator transition (MIT) in d-band correlated metal oxides has promising applications in DC electrical transport, its understanding in AC transport and potential electronic applications remain unclear. This study demonstrates the frequency dependence of impedance across the critical MIT temperature in thin film rare-earth nickelates, showing non-continuous variation in impedance phase and regulating tendencies with frequency. By introducing AC frequency as a new freedom, MIT behavior can be electronically regulated, providing new possibilities for electronic applications.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Ki Sang Baek, Seung-Wook Baek, Hyunil Kang, Wonseok Choi, Jun-Young Park, Stefan Saxin, Shin Ku Lee, Jung Hyun Kim
Summary: This study reports the electrical conductivity characteristics of SmBa0.5Sr0.5Co2O5+delta (SBSCO) and finds that sintering temperature and current range have an impact on its conductivity. Higher sintering temperature and lower current range result in higher electrical conductivity.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Xiaojuan Lu, Ziqian Li, Songtao Liu, Ke Huang, Jiankang Hai
Summary: In this study, rare earth elements were used to dope NASICON type solid electrolyte LATP, and it was found that the type and amount of rare earth elements had a significant impact on LATP properties. Doping of rare earth elements increased the relative density and total ionic conductivity of LATP, while decreasing the grain size and electronic conductivity. Among the three rare earth elements studied, Lu-doped LATP exhibited the highest total ionic conductivity and an order of magnitude lower electronic conductivity compared to un-doped LATP. Furthermore, the failure mechanism of the test cell was attributed to the degradation of the electrolytes and irreversible decomposition of electrodes based on the relaxation time distribution spectra analysis.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Sicheng Lu, Fang Yin, Yujia Wang, Nianpeng Lu, Lei Gao, Huining Peng, Yingjie Lyu, Youwen Long, Jia Li, Pu Yu
Summary: This study explores the structural phase transition of brownmillerite SrCoO2.5 and its influencing factors. It is found that using aqueous alkali as the electrolyte can trigger a rapid transition, while the acid solution with rich protons can also induce an unexpected phase transition in a faster manner. Theoretical calculations reveal that this transition is caused by a proton-assist ionic disproportionation.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Alexandr Stupakov, Tomas Kocourek, Esther de Prado, Joris More-Chevalier, Volha Vetokhina, Alexandr Dejneka, Marina Tyunina
Summary: This study expands the understanding of charge transport mechanisms in rare-earth nickelates ReNiO3, finding that LaNiO3 exhibits metallic behavior at high temperatures, while NdNiO3 and SmNiO3 show additional thermally activated hopping conductivity.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Materials Science, Ceramics
Lin Zhou, Ji-Xuan Liu, Tian-Zhe Tu, Yue Wu, Guo-Jun Zhang
Summary: This study reports a fast grain growth phenomenon in high-entropy ceramics and suggests that the grain growth behavior in these ceramics is not dominated by the sluggish diffusion effect. XPS analysis reveals the presence of more oxygen vacancies in high-entropy ceramics, which promotes the migration and diffusion of cations and increases the grain growth rate.
JOURNAL OF ADVANCED CERAMICS
(2023)
Article
Materials Science, Ceramics
Hironari Sugiyama, Juyong Kim, Satoru Yamanaka, Yoonho Kim, Nguyen Chi Trung Ngo, Juan Paulo Wiff, Tsuneo Suzuki, Masaaki Baba, Masatoshi Takeda, Noboru Yamada, Tohru Sekino, Hideki Hashimoto, Hirohisa Tanaka, Koichi Niihara, Tadachika Nakayama
Summary: This study focused on utilizing waste heat as renewable energy by fabricating PLZST ceramics with different compositional ratios and evaluating their electrical properties and power densities. It was found that adjusting the Zr and Sn ratio can increase the power densities obtained.
JOURNAL OF ASIAN CERAMIC SOCIETIES
(2022)
Article
Nanoscience & Nanotechnology
Yonghyun Cho, Tomoyo Goto, Sunghun Cho, Tohru Sekino
Summary: This study presents a surface functionalization strategy for BaTiO3 nanocubes (BTNcs) using 3,4-dihydroxybenzoic acid (DHBA) as the immobilizing ligand. By replacing the surfactant molecules on BTNcs with a ligand that formed the basic structure of DHBA, and modifying the ions of the end groups through chemical treatment, targeted functional groups or elements were accurately replaced. This protocol allows for varying dispersibility, interfacial charge transfer characteristics, resultant electronic structure, and chemical bonding between nanocrystals and molecules, providing potential applications in energy conversion, data storage, and biomedical fields for tunable dielectric oxide nanocubes.
ACS APPLIED NANO MATERIALS
(2022)
Article
Materials Science, Ceramics
Hironari Sugiyama, Juyoung Kim, Satoru Yamanaka, Yoonho Kim, Nguyen Chi Trung Ngo, Juan Paulo Wiff, Tsuneo Suzuki, Masaaki Baba, Masatoshi Takeda, Noboru Yamada, Tohru Sekino, Hideki Hashimoto, Hirohisa Tanaka, Koichi Niihara, Tadachika Nakayama
Summary: Efforts are being made to increase energy consumption efficiency by using dissipated heat as a renewable energy source and recovering electrical energy through the pyroelectric effect. The net power density of a (Pb, La) (Zr, Sn, Ti)O3 material is evaluated, and it is shown that high power density can be achieved within a specific temperature range.
CERAMICS INTERNATIONAL
(2022)
Article
Physics, Applied
Takuro Kawasaki, Tatsuo Fukuda, Satoru Yamanaka, Tomokazu Sakamoto, Ichiro Murayama, Takanori Katou, Masaaki Baba, Hideki Hashimoto, Stefanus Harjo, Kazuya Aizawa, Hirohisa Tanaka, Masatoshi Takeda, Tohru Sekino, Tadachika Nakayama, Yoonho Kim
Summary: The microscopic origin of pyroelectric power generation using ferroelectric ceramics for energy harvesting from time-varying waste heat has been investigated through operando neutron diffraction measurements. The behaviors of domain orientation and lattice strain in lead zirconatetitanate-based ceramics during the power generation cycle combining electric field and temperature change were studied. Larger structural changes in the material and cycle conditions were found to give higher power density.
JOURNAL OF APPLIED PHYSICS
(2022)
Editorial Material
Materials Science, Multidisciplinary
Ruxia Liu, Shota Higashino, Koji Hagihara, Lianmeng Zhang, Tohru Sekino, Masakazu Tane
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Takafumi Kusunose, Daisuke Tominaga, Tohru Sekino
Summary: The electrical conductivity of Al2O3 ceramics was increased by precipitating a small amount of ITO grain boundary phase, resulting in electrically conductive Al2O3/ITO grain boundary composites. The temperature dependency of the electrical conductivity observed in ITO was maintained in the composites.
JOURNAL OF ASIAN CERAMIC SOCIETIES
(2022)
Article
Materials Science, Ceramics
Anastasija Afonina, Agne Kizalaite, Aleksej Zarkov, Audrius Drabavicius, Tomoyo Goto, Tohru Sekino, Aivaras Kareiva, Inga Grigoraviciute-Puroniene
Summary: Synthetic magnesium whitlockite, known as a bone substitute, has gained attention recently. This research investigates the possibility of modifying the calcium to magnesium ratio in the material's structure, which can influence its biological properties. Nanocrystalline whitlockite samples were synthesized through a dissolution-precipitation process using brushite and magnesium ions, and changes in lattice parameters were observed due to the difference in ionic radii between calcium and magnesium ions.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Nobuyuki Terasaki, Moe Sakaguchi, Hajime Chiba, Touyou Ohashi, Yoshiyuki Nagatomo, Yoshirou Kuromitsu, Tohru Sekino, Kevin M. Knowles
Summary: By investigating the interfacial reactions related to the TiN layer growth process between nanocrystalline epitaxial layers of AlN and a Ti-containing metal brazing or sintering layer, it was found that the TiN layer produced at the metal/AlN interfaces consisted of TiN particles smaller than 50 nm and grain boundary phases including Al-containing Ag and Al-containing Cu. The concentration of Al within the TiN layer decreased as the distance increased from the AlN epitaxial layer, indicating the existence of a local Al-based eutectic liquid phase and elemental transport through this eutectic liquid phase.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Ceramics
Shengfang Shi, Hideki Hashimoto, Tohru Sekino
Summary: This study examines the influence of Co3+/Co2+ content ratio on the piezoelectric properties of lead-free BCZT ceramics. Co ions were doped into BCZT ceramics using CoO powder and sintered under different atmospheres. The substitution of Co2+ induces more oxygen vacancies for densification and grain growth, while Co3+ substitution leads to lattice distortion. When the Co3+/Co2+ ratio was close to 1.0 and the oxygen concentration was 30 vol%, the ceramic exhibited the highest piezoelectric constant and Curie temperature. This study suggests that optimizing the sintering atmosphere can enhance the piezoelectric properties of composition-modified BCZT ceramics.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Nobuyuki Terasaki, Naochika Kon, Hajime Chiba, Touyou Ohashi, Tohru Sekino
Summary: The interfacial structure between Cu and WC-Co cemented carbide after Ag-Cu vacuum brazing was evaluated. It was found that Ag and Cu penetrated the grain boundary phase, which initially consisted of Co, over a distance of about 1 µm from the surface of the WC-Co cemented carbide. A Co-containing segregated layer with a thickness of about 2-7 nm formed at both the Cu-rich phase/WC grain interface and the Ag-rich phase/WC grain interface. Furthermore, a Cu-containing segregated layer with a thickness of about 2 nm formed on the Ag-rich phase side against the Co-containing segregated layer at the Ag-rich phase/WC grain interface. This suggests that the formation of the Co-containing segregated layer originated from the local interfacial reaction between the Co dissolved in molten Ag-Cu phase and the WC grains during brazing.
Article
Chemistry, Physical
Taishi Yokoi, Masahiro Watanabe, Tomoyo Goto, Sikun Meng, Tohru Sekino, Masaya Shimabukuro, Masakazu Kawashita
Summary: Octacalcium phosphate (OCP) is a layered functional material that can incorporate various dicarboxylate ions. In this study, glutarate-ion-incorporated OCP was synthesized using calcium carbonate, phosphoric acid, and glutaric acid. The synthetic procedure resulted in a single-phase OCP with a high incorporation fraction of glutarate ions (90%), which is significantly higher than previous studies (35%). These findings have implications for the development of novel functional ceramic biomaterials.
Article
Multidisciplinary Sciences
Nobuyuki Terasaki, Naochika Kon, Hajime Chiba, Touyou Ohashi, Tohru Sekino
Summary: In order to study the interfacial reaction between the Ag-Cu alloy layer and TiN in active metal brazing, the brazed interfacial structures between Cu and TiN sintered ceramics were examined. No grain boundary phase components were detected on the TiN grain surfaces before brazing. The Ag-Cu alloy layer was bonded onto the TiN grains through a segregation layer formed by an interfacial reaction.
SN APPLIED SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
Karen Kuroyama, Ryuichi Fujikawa, Tomoyo Goto, Tohru Sekino, Fumiya Nakamura, Hiromi Kimura-Suda, Peng Chen, Hiroyasu Kanetaka, Tomoka Hasegawa, Kaname Yoshida, Masaru Murata, Hidemi Nakata, Masaya Shimabukuro, Masakazu Kawashita, Tetsuya Yoda, Taishi Yokoi
Summary: This paper reports the synthesis of highly damage tolerant calcium phosphate-based materials with a bioinspired design for artificial bones. The material demonstrates excellent damage tolerance and unique mechanical properties derived from its microstructure. It has the potential to be used for long-term in vivo applications.
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Agne Kizalaite, Vytautas Klimavicius, Vytautas Balevicius, Gediminas Niaura, Andrei N. Salak, Jen-Chang Yang, Sung Hun Cho, Tomoyo Goto, Tohru Sekino, Aleksej Zarkov
Summary: Magnesium whitlockite (Mg-WH) is a potential bioceramic material for bone regeneration, but its fabrication using conventional methods is limited due to thermal instability. In this study, Mg-WH was synthesized using a dissolution-precipitation process under hydrothermal conditions. The thermally induced degradation of the synthesized powders was investigated through various analytical techniques, revealing the gradual decomposition of Mg-WH and the coexistence of different phases at elevated temperatures.
Article
Chemistry, Multidisciplinary
Hyunsu Park, Do Hyung Han, Tomoyo Goto, Sunghun Cho, Yukihiro Morimoto, Tohru Sekino
Summary: Low-dimensional titanate nanostructures have gained attention as a promising material for photocatalytic applications. In this study, a facile bottom-up synthesis method was developed to produce visible light-activated peroxo-titanate nanoribbons. The use of a peroxo-titanium complex ion containing potassium as a precursor enabled the formation of layered potassium titanate structures under mild synthetic conditions. The anisotropic crystal growth of the layered titanate crystals was found to be influenced by the size of the interlayer cation. The resulting peroxo-titanium functional groups significantly reduced the bandgap of the titanate, resulting in excellent photocatalytic performance under both visible light and UV light. These findings not only contribute to the development of highly functionalized materials for photochemical applications, but also have low environmental impact.
NANOSCALE ADVANCES
(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)
