Article
Chemistry, Physical
Yanzhi Zhang, Shijiu Liu, Qian Zhang, Tianxiang Ning, Xinli Wang, Anxian Lu
Summary: The microstructure and electrochemical properties of Li1.125Ta0.875-xNbxZr0.125SiO5 ceramics prepared via the solid-phase reaction method were investigated. The conductivity of the ceramics increased and then decreased as the Nb doping concentration increased. Nb doping at 0.1875 mol facilitated the fusion and connection between grains, reducing the number of grain boundaries and increasing the conductivity. The structural distortion caused by the discrepancy in ionic radii of Ta5+ and Nb5+ allowed for more accommodation of Li ions and promoted Li+ diffusion, reducing the energy potential barrier for ion transport. The Li1.125Ta0.6875Nb0.1875Zr0.125SiO5 ceramic exhibited the highest conductivity, making it a potential candidate for all-solid-state batteries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Inorganic & Nuclear
Ya-Zhe Xing, Yin-Ni Men, Xiao Feng, Ji-Hua Geng, Zhi-Rui Zou, Fu-Hua Chen
Summary: The effect of CuO addition on the microstructure and ionic conductivity of 8YSZ was investigated. The results show that with increasing CuO doping content, the lattice parameter decreases, while the relative density and mean grain size increase. 2 mol% CuO-doped 8YSZ exhibits the lowest activation energy and the highest ionic conductivity.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Kiflom Gebremedhn Kelele, H. C. Ananda Murthy, Ruthramurthy Balachandran, Aschalew Tadesse, Yosef Nikodimos, Lemma Teshome Tufa, Jaebeom Lee
Summary: Both barium strontium titanate (BST) and its selenium doped sample were synthesized through a sol-gel method and their microstructural and morphological effects were studied. The addition of selenium affected the crystal size, lattice parameter, particle size, specific surface area, and morphology of the BST materials.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Engineering, Chemical
Jie Liu, Jiahao Shen, Jingjing Wang, Yuan Liang, Routeng Wu, Wenwen Zhang, Delin Shi, Saixiang Shi, Yanping Wang, Yimin Wang, Yumin Xia
Summary: The solubility of polyanilines (PANI) was enhanced by introducing polymeric ionic liquid (PIL) into the polymerization synthesis process. The PANIs doped with PILs were found to be soluble in various organic solvents and maintained their chemical structure and conductivity.
FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING
(2021)
Article
Electrochemistry
Jie Yu, Hui Liu, Xiuhua Chen, Jie Xing, Bo Yuan, Min Wang, Wenhui Ma
Summary: This study synthesized three LSGM perovskite-type oxides and investigated their crystal structures and ionic conductivities, revealing that LSGM8282 exhibits the highest ionic conductivity among them. This finding is significant for the development of efficient solid oxide fuel cells.
Article
Engineering, Electrical & Electronic
Shuning Li, Jinsheng Li, Chenhe Zhou, Lei Wu, Jinhua Yan, Xiwei Qi
Summary: In this study, a single-phase high-entropy perovskite solid solution was synthesized at a low temperature using a solid-phase reaction method. The resulting ceramic material exhibited a high dielectric constant and low dielectric loss. The introduction of heterovalent ions improved the dielectric properties and reduced the residual polarization intensity and coercivity field.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Physical
D. A. Vinnik, V. E. Zhivulin, D. A. Uchaev, S. A. Gudkova, D. E. Zhivulin, A. Yu Starikov, S. Trukhanov, V. A. Turchenko, T. Zubar, T. P. Gavrilova, R. M. Eremina, E. Fadeev, E. Lahderanta, A. S. B. Sombra, D. Zhou, R. B. Jotania, Charanjeet Singh, A. Trukhanov
Summary: A series of solid solutions based on BaFe12-xTixO19 M-type barium hexaferrite doped with titanium cations have been obtained, and the unit cell parameters increase monotonically with temperature and doping concentration, while the spin-glass component in the magnetic phase state is fixed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Optics
Anastasia Yuzhakova, Dmitrii Salimgareev, Ahmad Turabi, Alexander Korsakov, Liya Zhukova
Summary: This article investigates the ionic conductivity of the AgCl - AgBr, AgBr - AgI, AgBr - TlBr0.46I0.54 solid solutions' systems at different temperatures. The study reveals the key role of the iodine anion in the conductivity nature of solid solutions, with a significant increase in conductivity observed in AgBr by introducing iodides. The obtained results lay a foundation for the design of optoelectronic devices, solid-state electrolytes, and acousto-optics.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Gara Kishor, R. N. Bhowmik, A. K. Sinha
Summary: Doping of various ions in M-type BaFe12O19 hexaferrite has been achieved through mechanical alloying and heat treatment, resulting in changes in structural phase, crystallite size, lattice strain, and magnetic moment.
Article
Crystallography
Gabriel Buse, Marius Stef, Irina Nicoara
Summary: Various concentrations of PbF2-doped BaF2 crystals were grown using the Bridgman method with a shaped graphite heater. The optical absorption spectra at room temperature exhibited two UV absorption bands (called A and D) associated with Pb2+ ions. The band structure was analyzed using Gaussian multi-peak fitting. The optical absorption method was used to study the distribution of Pb2+ ions and the effective segregation coefficient, which was found to be >1. Non-uniform distribution of Pb2+ ions was observed, accompanied by intense emission bands in the near UV and visible regions.
Article
Chemistry, Physical
Masakuni Takahashi, Toshiki Watanabe, Kentaro Yamamoto, Koji Ohara, Atsushi Sakuda, Takuya Kimura, Seunghoon Yang, Koji Nakanishi, Tomoki Uchiyama, Masao Kimura, Akitoshi Hayashi, Masahiro Tatsumisago, Yoshiharu Uchimoto
Summary: This study quantitatively elucidated the cause of lithium dendrite suppression by doping LiI into Li3PS4 solid electrolyte, finding that the interface maintenance and inhibition of reductive decomposition play a key role in dendrite formation. Additionally, the dendrite suppression ability was enhanced with increased ionic conductivity, indicating the significant contributions of both the physical properties of the lithium metal/solid electrolyte interface and the bulk ionic conductivity.
CHEMISTRY OF MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Katherine A. Acord, Alexander D. Dupuy, Xin Wang, Alexandra L. Vyatskikh, Olivia K. Donaldson, Timothy J. Rupert, James J. Wu, Qian Nataly Chen, Julie M. Schoenung
Summary: This study investigates the influence of L-PBF processing on the microstructure, mechanical properties, and ionic conductivity of LATP, demonstrating that binderless L-PBF can produce relatively dense LATP samples with desired crystal structure and mechanical properties. Laser scan speed affects the development of secondary phase particles and ionic conductivity, and further parameter optimization can improve the performance of L-PBF LATP.
JOURNAL OF MATERIALS RESEARCH
(2021)
Article
Electrochemistry
Anna V. Kasyanova, Julia G. Lyagaeva, Gennady K. Vdovin, Anna A. Murashkina, Dmitry A. Medvedev
Summary: The synthesis and comprehensive study of acceptor-doped lanthanum ytterbates were successfully conducted. These materials showed high chemical stability, good conductivity, and promising proton-conducting properties, making them suitable for various electrochemical devices, such as solid oxide fuel cells.
ELECTROCHIMICA ACTA
(2023)
Article
Chemistry, Physical
Xiaoren Zhou, Liwu Huang, Omar Elkedim, Yuexin Xie, Yiteng Luo, Qinghao Chen, Yang Zhang, Yungui Chen
Summary: LLZO solid-state electrolyte co-doped with Sr2+ and Mo6+ shows enhanced performance in terms of ionic conductivity and relative density. Doping appropriate amounts of Sr2+ and Mo6+ can significantly improve the conductivity and density of the sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Review
Chemistry, Physical
Nivedita Gandhewar, Pravin Shende
Summary: Ionic liquids (ILs) are composed of poorly coordinated ions and possess important physical properties at room temperature. They show less volatility and strong electrostatic force, making them ideal for various advanced applications in drug delivery, biosensing, biotechnology, and cosmetics. ILs have the potential to enhance drug release and prevent biofilm formation, offering new avenues for the fabrication of biochemical products in the future.
Article
Physics, Applied
Taro Kuwano, Ryoji Katsube, Steve Johnston, Adele C. Tamboli, Yoshitaro Nose
Summary: ZnSnP2, an emerging inorganic material for solar cells, was characterized using DLTS and PL, revealing shallow acceptor- and donor-like traps, as well as a deep level trap. These traps may result from defects in the material, leading to a shorter minority carrier lifetime.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Susumu Imashuku
Summary: The study demonstrates the possibility of distinguishing MgO center dot Al2O3 spinel particles and layer in MgO refractory for aluminum deoxidation process of stainless steel based on their luminescence colors in cathodoluminescence and X-ray excited optical luminescence images. The images can be acquired quickly within 2 seconds and 1 minute. Surface examination aids in precise identification, and XEOL imaging shows promise for nondestructive onsite evaluation of the MgO refractory.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2022)
Article
Chemistry, Physical
Issei Suzuki, Zexin Lin, Sakiko Kawanishi, Kiyohisa Tanaka, Yoshitaro Nose, Takahisa Omata, Shin-Ichiro Tanaka
Summary: Valence band dispersions of single-crystalline SnS1-xSex solid solutions were observed using ARPES, and the hole effective masses were directly evaluated. It was found that the hole effective masses decrease slightly with increasing Se content in the low Se composition range, but sharply in the high Se composition range.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Metallurgy & Metallurgical Engineering
Susumu Imashuku, Kazuaki Wagatsuma
Summary: This study proposes a method to correct the overestimated area of free lime in steelmaking slag by investigating the grain-boundary microstructures and using scanning transmission electron microscope observation. The actual thickness of free lime was found to be approximately 20 times smaller than the evaluation done via cathodoluminescence imaging. By assuming an overall thickness of 250 nm, the corrected area fractions decreased by 60%-80%. This method can determine the volume fraction of free lime in steelmaking slag more precisely, which helps prevent road expansion in the reuse of steelmaking slag.
ISIJ INTERNATIONAL
(2022)
Review
Metallurgy & Metallurgical Engineering
Susumu Imashuku, Kazuaki Wagatsuma
Summary: This paper reviews three emission spectrometric methods that can be used for inclusion analysis in steel materials, providing information on the number, size, distribution, and chemical composition of inclusion particles. Cathodoluminescence (CL), X-ray-excited optical luminescence (XEOL), and beam-scanning laser-induced breakdown spectrometry (LIBS) are employed for the imaging measurement of the inclusions. Alumina inclusions are evaluated as a typical specimen to compare their analytical performance. The ease of handling and rapid response are significant features for on-site/in-line analysis in steel production.
ISIJ INTERNATIONAL
(2022)
Article
Metallurgy & Metallurgical Engineering
Susumu Imashuku, Kazuaki Wagatsuma
Summary: The removal of Al2O3 and MgO·Al2O3 spinel inclusions is critical in stainless steel production. Understanding their formation mechanism is important for their removal, which can be facilitated through the use of novel analytical methods like cathodoluminescence imaging to distinguish between different types of inclusions. This method provides a better understanding of the composition and distribution of these inclusions in stainless steels.
ISIJ INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Susumu Imashuku
Summary: Identifying low-melting CaO-MgO-SiO2 phases is crucial for MgO-C refractories used in the steelmaking process as they accelerate the corrosion of the refractories. This study proposes the use of cathodoluminescence (CL) imaging for the rapid identification of these phases at the reaction interface between MgO-based refractory and steelmaking slag.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Susumu Imashuku, Kazuaki Wagatsuma
Summary: This paper presents a method for rapidly identifying and determining the f-MgO content in industrial steelmaking slag using a scanning microscopy-cathodoluminescence (SEM-CL) instrument. The proposed method distinguishes f-MgO from other minerals by observing the colors and contrast of images, and determines the f-MgO content based on the identified areas.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2022)
Article
Spectroscopy
Susumu Imashuku, Haruka Narita, Kazuaki Wagatsuma
Summary: This study explored the use of optical emission spectroscopy for in situ elemental analysis of films and proposed a method for selecting emission lines to determine film composition. The results showed that the conventional method did not yield the highest R-2 value, while selecting the intensity ratio of Cu I lines to Zn I lines with high R-2 values could determine the composition of the deposited films in real time.
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
(2022)
Article
Metallurgy & Metallurgical Engineering
Susumu Imashuku, Michihisa Fukumoto, Kano Nakajima, Shigeru Suzuki
Summary: This study investigated the formation of structural isomers of alumina (Al2O3) on the surfaces of Fe-Cr-Al alloys using various techniques. Different phases of Al2O3 were formed at different annealing temperatures, and the properties of Al2O3 were studied using CL and XPS techniques.
ISIJ INTERNATIONAL
(2022)
Article
Spectroscopy
Susumu Imashuku
Summary: This study presents a method of using cathodoluminescence (CL) imaging to identify and estimate the rough content of bastnaesite in mineral ores. By analyzing CL images and spectra emitted by minerals, the author found that bastnaesite can be identified by detecting specific luminescence colors and areas in the images. This approach can greatly reduce the time required to explore mines with potential REE reserves.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Physics, Applied
Isshin Sumiyoshi, Yoshitaro Nose
Summary: We investigated the minority carrier lifetime and behavior of lattice defects in ZnSnP2 bulk crystals and found that an electron trap with a short time constant contributes to the short carrier lifetime. The recombination through this trap is nonradiative, resulting in lower current density in ZnSnP2 solar cells. By preparing crystals under conditions with higher chemical potential of Zn, we achieved an enhancement of carrier lifetime and demonstrated an improvement in current density in ZnSnP2 solar cells.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Susumu Imashuku
Summary: The composition of Cu-Zn films can be determined by measuring the emission line intensities of Cu and Zn during sputter deposition. A new method was developed to extend the applicability of this method to a wider range of film compositions and different chamber pressures. By evaluating the linearity between the emission intensity ratio of Ni/Cu lines and the atomic ratio of Ni/Cu in the films, the composition of Ni-Cu films can be accurately determined regardless of the chamber pressure.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
(2023)
Article
Chemistry, Analytical
Susumu Imashuku, Takumi Kamimura, Tetsu Ichitsubo, Kazuaki Wagatsuma
Summary: In this study, a method for measuring three-dimensional hydrogen distribution in a Ni-MH battery cathode using LIBS was presented. The hydrogen distribution was converted to a state-of-charge distribution to interpret the reaction distribution in the cathode. The results showed that the method can help understand the deterioration mechanism of the Ni-MH battery and improve its cycle life and capacity.
Article
Nanoscience & Nanotechnology
Susumu Imashuku, Takumi Kamimura, Tomoya Kawaguchi, Tetsu Ichitsubo
Summary: For the development and maintenance of materials and infra-structures that enable the realization of hydrogen society, an analytical technique capable of determining hydrogen distribu-tion is highly desirable. Recently, we have developed a method using laser-induced breakdown spectroscopy (LIBS) for the quantitative determination of the three-dimensional hydrogen distribution; however, the validity of the method was not completely confirmed. Herein, we demonstrate the validity of the hydrogen mapping method using LIBS by comparing the hydrogen mapping and a surface photographic image of an electrodeposited Ni(OH)(2) cathode that was subjected to charge-discharge reaction cycles.
E-JOURNAL OF SURFACE SCIENCE AND NANOTECHNOLOGY
(2022)