Article
Chemistry, Multidisciplinary
Zhenhong Tan, Joey A. Lussier, Takumi Yamada, Yuanhui Xu, Takashi Saito, Masato Goto, Yoshihisa Kosugi, Dmitry Vrublevskiy, Yoshihiko Kanemitsu, Mario Bieringer, Yuichi Shimakawa
Summary: Contrary to expectation, the ambient pressure cation disordered InVO3 bixbyite was found to crystallize in the polar LiNbO3-type structure with a large calculated spontaneous polarization and antiferromagnetic coupling.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Physical
Sahel Karoui, Hassen Chouaib, Slaheddine Kamoun
Summary: In this study, a new ferroelectric relaxor (CH3NH3)(2)Sn(SCN)(2)Cl-2 was synthesized and characterized using single-crystal X-ray diffraction, powder XRD, DSC, IR spectroscopy, and dielectric measurements. The compound exhibited a diffuse ferro-paraelectric phase transition around 355 K and showed relaxor behavior with the transition temperature shifting towards higher temperatures with increasing frequency. The crystal structure consists of discrete ionic entities and methylammonium cations bonded through hydrogen-bonding contacts.
JOURNAL OF MOLECULAR STRUCTURE
(2022)
Article
Engineering, Electrical & Electronic
Yujie Zhang, Mingze Sun, Xiaoxiao Zhou, Shaochen Hu, Xiyue Zhang, Huili Zhang, Huaiyan Li, Jigong Hao, Wei Li
Summary: This study successfully integrated photoluminescence, ferroelectricity, and piezoelectricity in Pr3+-doped (Ba, Ca)(Ti, Sn)O-3 ferroelectric ceramics, showing excellent piezoelectric and photoluminescence properties. The mechanism of luminescence modulation and polarization processing was discussed in the research.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Multidisciplinary
Lu Chen, Youbing Li, Biao Zhao, Shanshan Liu, Huibin Zhang, Ke Chen, Mian Li, Shiyu Du, Faxian Xiu, Renchao Che, Zhifang Chai, Qing Huang
Summary: Electromagnetic (EM) wave pollution is harmful and it is crucial to develop new electromagnetic wave absorbing materials. Magnetic MAX phases with high conductivity and nanolaminated structure have attracted attention as potential candidates. Two new magnetic MAX phases were successfully synthesized by replacing Al atoms in the A sites with Fe atoms. These MAX phases exhibit ferromagnetic behavior and dual electromagnetic absorption mechanisms including dielectric and magnetic loss. The minimum reflection loss of one of the phases is -44.4 dB at 6.56 GHz with 3 mm thickness, and the effective bandwidth is 2.48 GHz. The electromagnetic wave absorption properties indicate the importance of magnetic loss along with dielectric loss. This work shows a promising composition-design strategy for developing MAX phases with good EM wave absorption performance by regulating both dielectric and magnetic loss simultaneously.
Article
Materials Science, Ceramics
Kang Du, Changzhi Yin, Zhengyu Zou, Mingfei Cheng, Yiyang Cai, Jiaqing Yang, Meng Zhang, Wenzhong Lu, Shengxiang Wang, Wen Lei
Summary: Novel BaCa2M3O9 (M = Si, Ge) microwave dielectric ceramics were prepared via solid-state reaction and sintering, exhibiting triclinic structure and good microwave dielectric properties. Single-phase BaCa2Ge3O9 ceramic was synthesized for the first time and confirmed through Rietveld refinement and high-resolution transmission electron microscopy/selected area electron diffraction. The BaCa2M3O9 (M = Si, Ge) ceramics showed their microwave dielectric properties were influenced by factors such as relative density, ionic polarizability, relative covalence, and bond energy of M-O bond.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Inorganic & Nuclear
Yumi Matsuo, Yuko Matsukawa, Masahiro Kitakado, George Hasegawa, Suguru Yoshida, Ryoto Kubonaka, Yuya Yoshida, Tatsushi Kawasaki, Eiichi Kobayashi, Chikako Moriyoshi, Saneyuki Ohno, Koji Fujita, Katsuro Hayashi, Hirofumi Akamatsu
Summary: A novel perovskite fluoride, LixCoF3, with an exceptionally low tolerance factor has been synthesized through low-temperature lithium intercalation. The compound exhibits a high-temperature LiNbO3-type structure and undergoes a paramagnetic-to-antiferromagnetic transition.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Patric Berger, Clemens Schmetterer, Herta Effenberger, Hans Flandorfer
Summary: This study presents the first reported isothermal sections of the Sb-Sn-Ti system at different temperatures, identifying two new ternary phases and determining their crystal structures using X-ray diffraction.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Xueyin Bai, Minqian Liu, Shujie Pang, Huaping Xiong, Xinyu Ren, Haishui Ren, Tao Zhang
Summary: Novel Ti-based amorphous/nanocrystalline alloys with low liquidus temperatures were developed as brazing filler metals to enhance the mechanical properties of titanium alloy brazed joints. The joints brazed with Ti-Zr-Co-Cu-V(Al) fillers showed improved tensile shear strength and impact toughness compared to those brazed with Ti-Zr-Co-Cu-Sn fillers. The Ti-Zr-Co-Cu-Al amorphous/nanocrystalline filler is a promising brazing material for joining titanium alloys.
MATERIALS CHARACTERIZATION
(2023)
Article
Chemistry, Multidisciplinary
Milosz Rybak, Tomasz Wozniak, Magdalena Birowska, Filip Dybala, Alfredo Segura, Konrad J. Kapcia, Pawel Scharoch, Robert Kudrawiec
Summary: Optical measurements under externally applied stresses were used to study the stress-induced changes in electronic structure of MX2 compounds. The results showed that the studied materials are semiconducting and the transitions between bands are optically active. The energy trends under external stresses were quantified and compared with experimental results. This research provides a basis for future measurements.
Article
Materials Science, Multidisciplinary
Ye Shao, Lihuai Shu, Fengzhen Huang, Shuo Yan, Xiaomei Lu, Jinsong Zhu
Summary: The ME effect in M-type hexaferrites is enhanced by introducing the 5d element iridium with strong spin-orbit coupling. Doping with iridium results in the formation of conical spin order in SrMgxIrxFe12-2xO19 ceramics and exhibits temperature-dependent behavior synchronized with the displacive polarization.
Article
Chemistry, Physical
Zeljko Rapljenovic, Nikolina Novosel, Damir Dominko, Virna Kisicek, David Rivas Gongora, Duro Drobac, Mladen Prester, Denis Vinnik, Liudmila N. Alyabyeva, Boris P. Gorshunov, Tomislav Ivek
Summary: This study presents the frequency-dependent magnetic susceptibility and dc electric transport properties of three different compositions of hexaferrite Ba1-xPbxFe12-yAlyO19 single crystals. The correlation between the activation energies of the dc electric transport and the ac magnetic susceptibility is found to persist over the entire studied range of aluminum substitution y = 0-3.3, pointing toward a general relaxation mechanism in ferrimagnetic semiconductors that directly affects the dynamic magnetic properties via electrical transport.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Inorganic & Nuclear
Dong Zhang, Shen-Jing Ji, Yu Cao, Nian-Tzu Suen
Summary: The study demonstrates that alloying Ni metal with different elements can control its intrinsic activity towards the hydrogen evolution reaction (HER). Ni3Ti and Ni3Sn alloys show higher intrinsic HER activities compared to Ni metal, while Ni3Ge displays the worst HER performance.
DALTON TRANSACTIONS
(2022)
Article
Materials Science, Multidisciplinary
Zhihao Lou, Xin Xu, Ping Zhang, Lingyun Gong, Qian Chen, Jie Xu, Artur Rydosz, Feng Gao
Summary: Entropy engineering has been applied to synthesize a series of high-entropy dielectric ceramics, and the influence of mixing entropy on phase stability and dielectric properties has been investigated. The introduction of tetravalent cations can induce distortion of oxygen octahedron and antiparallel cation displacement, leading to excellent dielectric performance and stability. This research provides valuable insights for entropy engineering to control dielectric properties and phase stability.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Jian Fu, Aiwen Xie, Tianyu Li, Ruzhong Zuo
Summary: We introduce a new strategy to construct lead-free piezoelectric ceramics with an ultrahigh piezoelectric coefficient. This study provides a new paradigm for enhancing the piezoelectric coefficient of lead-free ceramics.
Article
Materials Science, Ceramics
Congxue Su, Liang Fang, Laiyuan Ao, Qianbiao Du, Yifan Zhai, Jie Li, Junqi Chen, Ying Tang, Laijun Liu
Summary: By substituting Zr4+ with Sn4+, the packing fraction is increased and the Q x f value is enhanced, resulting in good microwave dielectric properties. A smaller oxygen bond valence contributes to the improvement of the microwave dielectric properties of the material.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Review
Chemistry, Inorganic & Nuclear
Mitsuru Itoh, Yosuke Hamasaki, Hiroshi Takashima, Rie Yokoi, Ayako Taguchi, Hiroki Moriwake
Summary: Since the discovery of BaTiO3 in 1943, perovskite-type materials have been crucial in the research and application of ferroelectric materials. By studying factors such as ionic and covalent bonding, we have gained insights into the evolution of ferroelectricity and made progress in designing new ferroelectric materials.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Multidisciplinary
Xia Cai, Yiming Zhang, Zejiao Shi, Ying Chen, Yujie Xia, Anran Yu, Yuanfeng Xu, Fengxian Xie, Hezhu Shao, Heyuan Zhu, Desheng Fu, Yiqiang Zhan, Hao Zhang
Summary: The authors propose a multi-step and multi-stage screening scheme to accelerate the discovery of hybrid organic-inorganic perovskites, combining machine learning with high-throughput calculations for pursuing excellent efficiency and thermal stability in solar cells. Through this screening process, they successfully identified four experimental-feasible candidates with good stability and high efficiency, which were further verified by density-functional theory calculations.
Article
Materials Science, Multidisciplinary
Zuojian Jiang, Jiayan Huang, Renchen Yuan, Ning'an Xu, Ying Jiang, Jiye Zhang, Faqiang Zhang, Juanjuan Xing, Hui Gu, Desheng Fu
Summary: The coexistence of orthorhombic and tetragonal phases in Ba(Ti1-xSnx)O-3 ceramics enhances their piezoelectric response by facilitating the rotation of ferroelectric domains. Changes in the phase structure result in significant redshifts of defect peaks, which can be detected through cathodoluminescence (CL) analysis.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2022)
Article
Chemistry, Physical
Payel Aich, Shreya Das, Shuvajit Halder, Carlo Meneghini, Desheng Fu, Vasudeva Siruguri, Som Datta Kaushik, Mitsuru Itoh, Tanusri Saha-Dasgupta, Sugata Ray
Summary: We propose a novel approach to achieve multiferroicity in a single phase by engineering the anionic network and creating local geometric distortions in fluorinated, vacancy-ordered brownmillerite Ca2Mn2O5-xFy. The system exhibits both ferroelectricity and an antiferromagnetic order above room temperature, pointing toward a new route to multiferroicity through anion mixing.
CHEMISTRY OF MATERIALS
(2023)
Article
Electrochemistry
Takumi Hasegawa, Fan Bai, Daisuke Mori, Sou Taminato, Yasuo Takeda, Osamu Yamamoto, Hiroaki Izumi, Hironari Minami, Nobuyuki Imanishi
Summary: In this study, a composite separator consisting of Kimwipe paper and porous polyethylene was successfully used to suppress lithium dendrite formation and growth, providing a new solution for the practical application of lithium metal as a battery anode.
Article
Chemistry, Multidisciplinary
Rebecca Scatena, Ran Liu, Vladimir V. Shvartsman, Dmitry D. Khalyavin, Yoshiyuki Inaguma, Kazunari Yamaura, Alexei A. Belik, Roger D. Johnson
Summary: We demonstrate a polar phase in the columnar perovskite (NaY)MnMnTi4O12, resulting from cation ordering on A site columns, which are oppositely displaced through coupling to B site octahedral tilts. This ordering, controlled by annealing temperature, also polarizes the local dipoles associated with pseudo-Jahn-Teller active Mn2+ ions, generating an additional ferroelectric order. Below T-N approximately 12 K, Mn2+ spins order, making this system rare in having ordered electric and magnetic dipoles on the same transition metal sublattice.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Physics, Applied
Sou Yasuhara, Shintaro Yasui, Takuya Hoshina, Mitsuru Itoh, Takaaki Tsurumi
Summary: Epitaxial thin films have unique properties due to epitaxial strain, but the presence of defects disrupts these effects. High-temperature annealing can improve film quality, but weakens bottom electrode materials. This study focused on Nb-doped CaMnO3 as a bottom electrode to evaluate BaTiO3 ferroelectricity, demonstrating the ability to withstand high temperatures and enhance ferroelectric properties.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Yoshiyuki Inaguma, Akihisa Aimi, Takahiro Ao, Yosuke Hamasaki, Daisuke Mori, Koichiro Ueda, Minoru Ikeda, Takahisa Ohno, Kazutaka Mitsuishi
Summary: We synthesized polycrystalline perovskite-type Li-ion-conducting oxides and evaluated their crystal structure, microstructure, ionic conductivity, and electrochemical stability. The compound with the composition Sr0.458Li0.384Ti0.3Ta0.7O3 exhibited the highest bulk and total ionic conductivity, which were higher than those of the reference material LLTO. First-principles calculations showed that the distortion of BO6 octahedra and the second-order Jahn-Teller effect facilitated the diffusion of Li ions. A solid-state Li-ion battery using Sr0.458Li0.384Ti0.3Ta0.7O3 as the electrolyte showed promising performance.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Hiroshi Takashima, Yoshiyuki Inaguma, Masayoshi Nagao, Katsuhisa Murakami
Summary: We successfully obtained BaSnO3 perovskite thin films with remarkable near-infrared luminescence by van der Waals growth. The films were grown on quartz glass substrates using hexagonal boron nitride as the seed layer, and their crystallinity was confirmed by X-ray diffraction and transmission electron microscopy. The grown film exhibited a broad near-infrared emission peak centered at 920 nm. The transparent BaSnO3 film, with high transparency and remarkable near-infrared emission, obtained through van der Waals-type growth, can be applied in wavelength conversion devices to improve the efficiency of Si single-crystal solar cells. The hexagonal boron nitride seed layer is an effective method for high-quality crystal growth of perovskite-type oxides with various functionalities.
Article
Materials Science, Multidisciplinary
Rafikul Ali Saha, Jhuma Sannigrahi, Ilaria Carlomagno, S. D. Kaushik, Carlo Meneghini, Mitsuru Itoh, Vasudeva Siruguri, Sugata Ray
Article
Chemistry, Multidisciplinary
Tomohiro Kakimi, Shuntaro Miyakawa, Sou Taminato, Takaya Saito, Daisuke Mori, Nobuyuki Imanishi
Summary: Coating the surface of a copper electrode with an Al2O3 thin film improves the deposition and dissolution behavior of lithium metal anodes, reducing dendrite growth and enhancing the safety and cycling performance of batteries.
Article
Chemistry, Physical
Ryusuke Mizuochi, Kengo Oka, Yoshiyuki Inaguma, Kazuhiko Maeda
Summary: A two-dimensional perovskite oxyfluoride electrode, Pb3Fe2O5F2, exhibited high activity for electrochemical oxidation of water, with almost unity faradaic efficiency and a significantly lower oxidation potential compared to the 3D bulk analogue PbFeO2F prepared in a similar manner.
SUSTAINABLE ENERGY & FUELS
(2022)
Article
Materials Science, Multidisciplinary
Shojiro Kimura, Hiroaki Onishi, Akira Okutani, Mitsuru Akaki, Yasuo Narumi, Masayuki Hagiwara, Kouichi Okunishi, Koichi Kindo, Zhangzhen He, Tomoyasu Taniyama, Mitsuru Itoh
Summary: In this study, the selection rules of optical transitions in BaCo2V2O8 were clarified using high-field electron spin resonance measurement. It was found that unconventional magnetic excitation can couple with both magnetic and electric fields in the field-induced quantum critical state. This coupling mechanism is attributed to the periodic spin interactions and magnetoelectric coupling in BaCo2V2O8.
