Article
Materials Science, Multidisciplinary
M. Sunkur, O. Gullu
Summary: This study investigates the impact of a Carmoisine azo dye layer on electronic transport at the p-silicon/Al interface. Various spectroscopic measurements are employed to analyze the Carmoisine dye molecule. The study finds that the Carmoisine dye enhances the performance of the Al/p-Si structures and reduces the ideality factor, while also decreasing the leakage current and defect-trapped charge density.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Raul I. Arriaga-Benitez, Mihriban Pekguleryuz
Summary: The influence of Mn, Cr and Zr on the creep behavior of an Al-Si-Mg-Cu alloy intended for Diesel engine applications was studied. Two alloys, MG1 and MG2-1, were creep tested at 300-350℃ and 28 MPa in the T7 heat-treated and soaked condition. The activation energy for creep was higher in MG2-1 compared to MG1. The creep mechanisms differed between the two alloys, with MG2-1 showing lower creep rates due to thermally activated restoration processes and Zener pinning by αMG2-1-Al(Mn,Cr,Fe)Si.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Geology
Peng Zhang, Lei Zuo, Yaqin Wang, XueFei Sun, Rui Liu, Lei Liu, YiFei Ma
Summary: Various shapes and sizes of nanoparticles, including scaly diaspore aggregates, columnar rutile particles, layered graphite assemblages, and kidney-shaped goethite particles, were found in the Jingxi bauxite deposit. These nanoparticles provide a nanometer basis for studying the difficult-to-migrate elements, such as Al and Si, and confirm an alkaline and reductive metallogenic environment.
ORE GEOLOGY REVIEWS
(2023)
Article
Chemistry, Physical
Xulin Mu, Kai Huang, Genxiang Zhu, Yan Li, Conghui Liu, Xiaojuan Hui, Manling Sui, Pengfei Yan
Summary: Exploring the structure transformation mechanism of spent cathodes during regeneration is crucial for optimizing the processing protocol. Different operation histories result in spent cathode materials with different states of health (SOH), posing a challenge for simultaneous restoration. In this study, we investigated the effects of SOH on the direct regeneration protocol for spent LiCoO2 (LCO) cathodes. We identified lithium-deficiency and Al impurity as important factors impacting the regeneration quality of spent LCO, causing void defects, disordered lattice structures, and the diffusion of Al impurity during high temperature sintering. Based on our understanding of the regeneration process, we optimized the protocol to successfully restore spent LCO with different SOH.
Article
Materials Science, Multidisciplinary
Daniel Wallerstein, Eugenio Luis Solla, Fernando Lusquinos, Rafael Comesana, Jesus del Val, Antonio Riveiro, Juan Pou
Summary: This study provides a thorough characterization of the IMC layer within dissimilar joints of aluminum alloy to structural steel, using electron diffraction-based techniques. The study identifies the eta-Fe2Al5 and theta-Fe4Al13 phases unequivocally, and for the first time, the ternary Fe4Al17.5Si1.5 phase is identified within an aluminum-steel dissimilar weld.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Ali Akbar Hussaini, Mehmet Okan Erdal, Kemal Dogan, Mustafa Koyuncu, Murat Yildirim
Summary: In recent years, there has been increasing focus on the photodiode properties of MS devices in order to enhance the performance of light sensing devices. In this study, LiCoO2 thin film was synthesized through a sol-gel-based electrospinning method and used as an interlayer for fabricating Al/LiCoO2/n-Si photodiode. The characterization results showed that the LiCoO2 thin film had a crystallite size of 37.75 nm. Electrical characterization using current-voltage and current-transient measurements demonstrated that the Al/LiCoO2/n-Si photodiode exhibited good behavior and a high rectifying ratio, with significant responsivity and detectivity. These findings suggest that LiCoO2-based devices can be utilized in optoelectronic applications.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Periyakaruppan Murugesan, V. Satheeshkumar, N. Jeyaprakash, Che-Hua Yang, Sundara Subramanian Karuppasamy
Summary: This study aims to manufacture AlSi10Mg parts using Laser Powder Bed Fusion (LPBF) process and analyze their mechanical properties. The results show that the parts manufactured by this process have refined microstructure, enhanced mechanical behaviors, and extended lifespan.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Arijit Mitra, Hsueh-Yuan Kuo, Jun-Han Huang, Gunalan Rachel, Wen-Huei Chu, Wei-Cheng Chiu, Jenn-Kun Kuo, Chuan-Pu Liu
Summary: A promising solution for on-demand production of hydrogen (H-2) has been demonstrated using nano-Silicon (Si) powders, which can yield 1.3 liters of H-2 per gram of Si at room temperature. The production yield and rate of H-2 can be controlled by adjusting the reaction pH value and temperatures. In situ liquid-phase transmission electron microscopy (LPTEM) was used to observe the real-time reaction, showing the formation of H-2 bubbles and the conversion of crystalline Si particles into amorphous oxides. Gas chromatography mass spectrometry (GC-MS) confirmed that the purity of the generated gas is 99.5%. These findings suggest a viable option for instant H-2 production in portable fuel cells using Si cartridges or pellets.
Article
Nanoscience & Nanotechnology
Anette B. Hagen, Sigurd Wenner, Ruben Bjorge, Di Wan, Calin D. Marioara, Randi Holmestad, Inga G. Ringdalen
Summary: Al-Mg-Si (6xxx series) alloys exhibit strong mechanical properties but are weakened by a soft precipitation free zone (PFZ) near grain boundaries during heat treatment, reducing material ductility. This study employs nanoindentation and microstructure characterization to quantitatively analyze these alloys. Experimental results confirm that the PFZ weakens the material, while an adjacent region exhibits increased hardness due to a higher density of precipitates. This previously unrecognized harder zone has important implications for the mechanical properties of large-grained aluminum alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Traian Florin Marinca, Mariana Carolina Sas, Amalia Mesaros, Razvan Hirian, Florin Popa, Bogdan Viorel Neamtu, Ionel Chicinas
Summary: A new Supermalloy alloyed with aluminum in powder form has been obtained by mechanical alloying. The alloy has a single FCC phase and a mean crystallite size of 15 nm after 15 hours of alloying. The Curie temperature of the alloy is around 440 degrees C. The presence of an oxide layer in the alloy was confirmed, with an estimated thickness of 100-200 nm.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Materials Science, Coatings & Films
Wenxu Ran, Yanqiang Qiao, Xiping Guo
Summary: This study investigates the micromechanical properties of Al, Y-modified silicide coating on Nb-Si based alloy. It is found that the coating exhibits anisotropic elastic and plastic properties, with the hardness and elastic modulus influenced by grain orientation and defects.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Ehab Samuel, Agnes M. Samuel, Fawzy H. Samuel
Summary: This study investigated the microstructural changes of Al-8.5%Si-1.75%Cu-0.55%Mg-0.2%Ti-0.32%Zr-0.015%Sr alloy under different artificial aging conditions using high resolution transmission electron microscopy (HR-TEM). The results showed the precipitation of GP zones and S-Al2CuMg phase particles after 20 hours of aging at 160 degrees C. Aging at 240 degrees C resulted in a series of precipitations, including GP zones and Q'-Al2Cu combined with the S-phase. High magnification images revealed dissolution and incoherency phenomena.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Multidisciplinary
Hong-Chen Yu, Yu-Zhuo Men, Shu-Guo Yang, Hui Liu, Lei Yu, Xue-Dong Xu, Yi-Fei Li, Chang-Sheng Zou, Hao-Nan Wang, Wei-Rong Zhong
Summary: The study investigated the combined influence of Mg/Si and Ca contents on the crystallization of primary Mg2Si in Al-Mg2Si alloy. By restricting the embryo formation and growth of primary Mg2Si, the researchers successfully prepared dice-like primary Mg2Si in an over-modified alloy, revealing a novel method to control the morphology and particle size of primary Mg2Si and further understand the crystallization process.
Article
Materials Science, Multidisciplinary
Mingyang Zhang, Chunming Wang, Gaoyang Mi, Ping Jiang, Xiong Zhang, Xiuhui Yan
Summary: SiCp/Al matrix composites have been widely used in aerospace and space station applications. However, the poor formability and low tensile strength in laser welding SiCp/AMCs have been a bottleneck. By using counterintuitive laser butt welding and proposing the concept of 'Perforating Laser Welding,' a high-strength welded joint was successfully prepared with enhanced load transfer capability through tailored interfaces.
Article
Chemistry, Physical
Jayshri Dumbre, Shravan K. Kairy, Elaf Anber, Timothy Langan, Mitra L. Taheri, Thomas Dorin, Nick Birbilis
Summary: Scandium (Sc) containing Al-Si model alloys were heat-treated to form (Al,Si)(3)Sc phase at 350 degrees C and V-phase (AlSc2Si2) at above 450 degrees C. The hardening of the alloys was attributed to the coherent nanoscale (Al,Si)(3)Sc precipitates, while significant softening was observed due to the formation of coarse V-phase. The V-phase was found to have a rod morphology and six new orientation relationships with the alpha-Al matrix were determined using TEM.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Electrochemistry
Akira Yano, Kazuki Yoshii, Tomonari Takeuchi, Hikari Sakaebe
Summary: This study investigated the charge/discharge characteristics and deposition/dissolution behavior of the Li metal negative electrode operating with high Li utilization, showing that adding vinylene carbonate or fluoroethylene carbonate can improve the Coulombic efficiency of the negative electrode. Granular particles were found on the surface of the negative electrodes without additives, while mainly fibrous residues were observed with additives. The cell capacity reduction was mainly attributed to different factors depending on the presence of additives.
Article
Chemistry, Multidisciplinary
Koji Kimura, Haruki Yoshikawa, Kairi Fujii, Hisao Kiuchi, Kazuki Yoshii, Tatsumi Hirano, Yasuhiro Takabayashi, Hikari Sakaebe, Kouichi Hayashi
Summary: This study demonstrated the feasibility of investigating the electrolyte-side of the Li/electrolyte interface using an X-ray total reflection phenomenon. By utilizing a specially designed cell and synchrotron X-ray sources, reflectivity curves and grazing incidence X-ray scattering measurements provided valuable insights into the structural properties of the electrolyte at the interfacial region.
Article
Electrochemistry
Yuki Umemura, Tomonari Takeuchi, Hikari Sakaebe, Hisao Kiuchi, Toyonari Yaji, Misaki Katayama
Summary: In this study, Phosphorus was introduced into VS4 to enhance its electrochemical cycle performance, resulting in a significant increase in cycle capability. The structural reversibility of VS4 for Li insertion/extraction reactions was improved by the addition of phosphorus.
Article
Electrochemistry
Satoshi Uchida, Hikari Sakaebe, Nobuhiko Takeichi
Summary: This study experimentally measured the viscosity and ionic conductivity of 1 mol kg(-1) LiPF6 dissolved in a binary solvent of ethylene carbonate (EC) and propylene carbonate (PC), showing that the preference of EC in Li+ solvation shell is similar to that of PC. The molar conductivity in the electrolyte system studied is mainly dominated by the diffusion coefficient of the charge carriers.
Article
Physics, Condensed Matter
Kairi Fujii, Keisuke Kibino, Koji Kimura, Kazuki Yoshii, Hisao Kiuchi, Tatsumi Hirano, Yasuhiro Takabayashi, Hikari Sakaebe, Kouichi Hayashi
Summary: A cell dedicated to characterizing the electrolyte side of the Li/electrolyte interface has been developed and successfully used to measure the reflected X-rays and scattering signals from the interface. The results demonstrate the cell's ability to accurately detect structural changes at the interface region.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2022)
Article
Electrochemistry
Yuta Maeyoshi, Kazuki Yoshii, Hikari Sakaebe
Summary: In this study, a localized high-concentration electrolyte is reported, which achieves stable Li plating/stripping cycling with high Coulombic efficiency. This electrolyte design holds significant potential for developing high-energy-density Li metal batteries.
Article
Microscopy
Noboru Taguchi, Tatsuya Uchida, Konomi Ikita, Akihiro Tanaka, Nobuyuki Ikeo, Kazushiro Yokouchi, Kenichi Tsutsumi
Summary: A method for obtaining a data cube using a semi-parallel detection scheme and an electrostatic hemispherical analyzer has been developed, improving measurement speed and correcting gain differences among detection channels to construct a data cube. An example with lead-free solder demonstrated the potential to extract spectra and create elemental distribution maps from any position within the measurement area.
Article
Electrochemistry
Hironobu Hori, Chikako Ishikawa, Atsushi Inoishi, Hikari Sakaebe, Shigeto Okada
Summary: In this study, the phase-separated nanostructures induced in a conversion-type electrode material of lithium-ion batteries were investigated using the small-angle X-ray scattering (SAXS) method. The results showed that the discharged ferrous fluoride (FeF2) electrodes exhibited modulated nanostructures with a spatial periodicity, and the size of the nanostructures depended on the cycle number. These findings provide important insights into the mechanism of conversion reactions.
Article
Chemistry, Multidisciplinary
Titus Masese, Godwill Mbiti Kanyolo, Yoshinobu Miyazaki, Miyu Ito, Noboru Taguchi, Josef Rizell, Shintaro Tachibana, Kohei Tada, Zhen-Dong Huang, Abbas Alshehabi, Hiroki Ubukata, Keigo Kubota, Kazuki Yoshii, Hiroshi Senoh, Cedric Tassel, Yuki Orikasa, Hiroshi Kageyama, Tomohiro Saito
Summary: Honeycomb-layered oxides with monovalent or divalent, monolayered cationic lattices have diverse crystalline features and are attractive for next-generation energy storage applications. This study investigates the composition and properties of global honeycomb-layered oxides, specifically Ag2M2TeO6 (M=Ni,Mg,etc), which exhibit Ag atom bilayers with sub-valent states within Ag-rich crystalline domains and Ag-deficient domains. The material shows high ionic conductivity and oxygen-hole electrochemistry during silver-ion extraction, and the bilayered structure and sub-valent states are theoretically understood by spontaneous symmetry breaking of SU(2)x U(1) gauge symmetry interactions. These findings suggest that bilayered frameworks have research applications beyond energy storage.
Article
Multidisciplinary Sciences
Yoshihiro Chida, Takeru Tomimori, Tomoaki Ebata, Noboru Taguchi, Tsutomu Ioroi, Kenta Hayashi, Naoto Todoroki, Toshimasa Wadayama
Summary: This study proposes an experimental platform to investigate the relationship between surface nanostructures and properties of high-entropy alloy electrocatalysts. High-entropy alloys have gained attention for improving performance of electrocatalysts. Understanding the relationship between surface atomic-level structures and catalytic properties is crucial for developing new catalysts. The platform allows the vacuum synthesis of atomic-level-controlled single-crystal high-entropy alloy surfaces and evaluation of their catalytic properties.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Sachio Komori, Kohei Tada, Noboru Taguchi, Tomoyasu Taniyama, Titus Masese
Summary: The magnetic and spin frustration properties of Ag-based honeycomb layered tellurates with magnetic honeycomb slabs separated by Ag bilayers were investigated. Antiferromagnetic ordering and signatures of enhanced spin-frustration were observed in the tellurates containing Ag-bilayers compared to other honeycomb layered tellurates without bilayers. These results might be promising for realizing the Kitaev quantum spin liquid.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Electrochemistry
Riki Kataoka, Noboru Taguchi, Kohei Tada, Akihiko Machida, Nobuhiko Takeichi
Summary: Layered P2-type Na containing manganese-nickel oxide (Na-2/3(Mn2/3Ni1/3)O-2) materials exhibit higher electrochemical capacity. The cycling performance of Na-2/3(Mn2/3Ni1/3)O-2 can be improved by reducing crystallite size and introducing defects at transition metal site, which restrict the structural changes. In addition, the metal defects enhance the contribution of oxygen redox without causing overpotential and capacity fading during cycling.
BATTERIES & SUPERCAPS
(2023)
Article
Chemistry, Multidisciplinary
Atsushi Inoishi, Hiroki Sato, Yixin Chen, Hikaru Saito, Ryo Sakamoto, Hikari Sakaebe, Shigeto Okada
Summary: All-solid-state Li batteries have gained significant attention for their high energy density and safety. This study utilized a MgH2 electrode material without a solid electrolyte, and achieved excellent performance by forming an ionic conduction path based on LiH in the electrode mixture.
Article
Electrochemistry
Kazuki Yoshii, Kazushige Kohno, Yuta Maeyoshi, Noboru Taguchi, Akira Yano, Tomonari Takeuchi, Hikari Sakaebe
Summary: This study investigated the charge and discharge behavior of a low-crystalline VS4 positive electrode using different electrolytes and under differing charge and discharge conditions. The electrolyte composed purely of cyclic carbonate displayed higher cycle performance than the one containing linear carbonate. Addition of fluoroethylene carbonate (FEC) to the electrolyte effectively improved the cycle performance. The results showed that LiF-containing components were formed on the VS4 surface, which contributed to the improvement of the charge and discharge behavior of the VS4 positive electrode.
BATTERIES & SUPERCAPS
(2022)
