Article
Chemistry, Physical
Hang Chen, Xiangyu Zhang, Ying Zhao, Shuo Wang, Yueming Ren, Xiyulu Wang
Summary: Efficient and stable transition metal-based catalysts are important for the heterogeneous catalysis of peroxymonosulfate in water purification. This study developed CuMnO2 catalysts and investigated their performance in catalyzing peroxymonosulfate to degrade Orange I. The optimal catalyst exhibited enhanced surface oxygen mobility and electron conduction, and showed low metal ion leaching and good reusability. Mechanism studies revealed the key active sites and reaction pathways for peroxymonosulfate activation.
SURFACES AND INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Cuixia Cheng
Summary: CuMnO2 nanoflakes were synthesized using a hydrothermal technique with nitrilotriacetic acid as a precipitant. The structure, composition, and morphology of the samples were characterized using various techniques. The as-prepared sample exhibited a high capacity of 993 mAh g(-1) after 300 cycles, excellent rate capabilities at different current densities, and a high specific capacitance even at a high current density of 12 A g(-1). The CuMnO2 nanoflakes also demonstrated stable cycling, excellent kinetics, and rate capabilities, making them promising for advanced lithium-ion batteries and supercapacitor applications.
Article
Green & Sustainable Science & Technology
Chuankun Yin, Siji Zhou, Keyi Zhang, Jiale Bai, Yangyang Lv, Xuewen Zhang, Xiaoxia Li, Aihua Xu
Summary: The study found that CuMnO2 exhibited higher activity and stability in degrading p-Nitrophenol using peroxymonosulfate. The interactions between Mn and Cu species in CuMnO2 were identified using X-ray photoelectron spectroscopy, leading to a new mechanism for PMS-mediated reaction.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Materials Science, Multidisciplinary
S. C. Das, J. Sannigrahi, P. Dutta, S. Pramanick, D. Khalyavin, D. T. Adroja, S. Chatterjee
Summary: Investigation on the magnetic equiatomic alloys MnNiGe0.9Al0.1 and MnNiGe0.928Ga0.072 using neutron powder diffraction technique revealed a martensitic phase transition and incommensurate antiferromagnetic ordering in the low-temperature martensitic phase. Additionally, a commensurate antiferromagnetic ordering was observed in the high-temperature austenite phase, with both structures coexisting down to the lowest temperature of measurement.
Article
Materials Science, Multidisciplinary
R. Roy, S. K. Adhikari, J. Sannigrahi, K. Mandal, S. C. Das, P. Dutta, S. Pramanick, D. Khalyavin, D. T. Adroja, S. Chatterjee
Summary: The magnetic structure of Fe-doped MnNiGe alloys was explored through detailed neutron powder diffraction study. Both alloys exhibited incommensurate antiferromagnetic ordering in the low-temperature martensitic phase, with the modulation of the magnetic structures depending on the doping site of Fe. Additionally, the application of external pressure had a significant effect on both the martensitic transition temperature and low-temperature magnetic structure of the alloys.
Article
Chemistry, Physical
Meng-Ru Cong, Chin-Wei Wang, Wei-Jun Ren, Maxim Avdeev, Chris D. Ling, Fei Gao, Bing Li, Zhi-Dong Zhang
Summary: We have successfully grown alpha-DyGa3 single crystals by the self-flux method and determined its magnetic structure using neutron powder diffraction. Alpha-DyGa3 crystallizes in a unique rhombohedral structure and possesses a specific antiferromagnetic structure.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Physics, Multidisciplinary
DianWu Song, LiXuan Zheng, FangHang Yu, Jian Li, LinPeng Nie, Min Shan, Dan Zhao, ShunJiao Li, BaoLei Kang, ZhiMian Wu, YanBing Zhou, KuangLv Sun, Kai Liu, XiGang Luo, ZhenYu Wang, JianJun Ying, XianGang Wan, Tao Wu, XianHui Chen
Summary: This study reveals the nature of density-wave-like transition in vanadium-based kagome superconductors through nuclear magnetic resonance measurements. It confirms the presence of a first-order structural transition and a three-dimensional structural modulation. The study suggests that the orbital order is the primary electronic order induced by the structural transition and provides evidence for possible orbital fluctuations.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2022)
Article
Chemistry, Physical
S. K. Adhikari, R. Roy, S. C. Das, J. Sannigrahi, S. Pramanick, S. Chattopadhyay, C. Ritter, D. T. Adroja, S. Chatterjee
Summary: Ni-doped Mn5Si3 alloys exhibit unique magnetic properties at room temperature, and the magnetic transition temperature decreases with increasing Ni concentration. The magnetic structure of the alloy is significantly affected by Ni-doping.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Multidisciplinary Sciences
Xubin Ye, Jianfa Zhao, Hena Das, Denis Sheptyakov, Junye Yang, Yuki Sakai, Hajime Hojo, Zhehong Liu, Long Zhou, Lipeng Cao, Takumi Nishikubo, Shogo Wakazaki, Cheng Dong, Xiao Wang, Zhiwei Hu, Hong-Ji Lin, Chien-Te Chen, Christoph Sahle, Anna Efiminko, Huibo Cao, Stuart Calder, Ko Mibu, Michel Kenzelmann, Liu Hao Tjeng, Runze Yu, Masaki Azuma, Changqing Jin, Youwen Long
Summary: The crystal structure of PbFeO3 is an unusual orthorhombic perovskite super unit cell with distinctive charge ordering. The presence of two different oxidation states of Pb and Fe leads to long range charge ordering in the -A-B-B- layers. The material exhibits weak ferromagnetic transition at 600K and spin reorientation towards a collinear antiferromagnetic structure at a lower temperature.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Ning Bin Zhang, Zhong Fang, Yin Lian Zhu, Yu Jia Wang, Yun Long Tang, Min Jie Zou, Xiu Liang Ma
Summary: Symmetry breaking induced by interfaces can lead to a variety of abnormal physical phenomena, which has inspired the exploration of oxide interface engineering. Understanding the structure variations of thin films caused by different interface conditions is critical for the successful application of LaCoO3-x materials in electronic devices. Oxygen vacancy configurations and concentration are closely related to the magnetic, electronic, and transport properties of perovskite oxides, and manipulating the vacancy structures of thin films is crucial for the development of functional devices. The atomic-scale observation and first-principles calculations in this study provide insights into the distribution of oxygen vacancies and its dependence on interface configurations.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Nanoscience & Nanotechnology
Xuyu Dong, Kun Lin, Chengyi Yu, Wenbin Zhang, Wenjie Li, Qian Zhang, Qiang Zhang, Jue Liu, Yili Cao, Xianran Xing
Summary: This work presents a single phase and nearly isotropic zero thermal expansion (ZTE) alloy (Hf0.8Nb0.2)Fe2.5 with dimensionally stable properties over a wide temperature range of 5-460 K. The introduction of excess Fe breaks the dual-phase structure, increases the magnetic ordering temperature, and induces spin reorientation, resulting in the ZTE behavior. The design concept of changing the internal magnetic interaction through non-stoichiometric regulation provides support for the discovery of novel ZTE materials.
SCRIPTA MATERIALIA
(2023)
Article
Physics, Condensed Matter
A. N. Matveeva, I. A. Zobkalo, A. Sazonov, A. L. Freidman, S. V. Semenov, M. I. Kolkov, K. Yu Terentjev, N. S. Pavlovskiy, K. A. Shaykhutdinov, V. Hutanu
Summary: The effect of substituting Dy by Ho on the magneto-electric behavior of Dy0.8Ho0.2MnO3 was studied using polarized and classical neutron diffraction, as well as macroscopic methods. It was found that substituting 20% of Dy with Ho did not change the overall crystal symmetry of the compound, which remained of Pbnm type at very low temperatures. The magnetic ordering, temperature, and field evolution were determined using single crystal neutron diffraction and magnetization measurements. The presence of a chiral magnetic structure on the Mn subsystem was confirmed below Tc & AP;16 K. Polarized neutron diffraction revealed that the rare earth magnetic ordering in Dy0.8Ho0.2MnO3 had a 3-component character, in contrast to DyMnO3. It was shown that doping with 20% Ho suppressed the spontaneous rare-earth ordering and allowed for coherent incommensurate spatial propagation between the manganese and rare earth subsystems. The study also demonstrated the strong magneto-electric coupling in the multiferroic phase, as evidenced by the direct influence of an external electric field on the magnetic chirality. The correlation between microscopic and macroscopic investigations was established by studying electric polarization under similar temperatures and fields on the same samples.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Chemistry, Inorganic & Nuclear
Johnny A. A. Sannes, Bruno Gonano, Oystein S. Fjellvag, Susmit Kumar, Ola Nilsen, Martin Valldor
Summary: The oxychloride SrTe2FeO6Cl has been synthesized through high-temperature solid-state synthesis under inert conditions. It has a novel monoclinic crystal structure and exhibits rare ordering of oxide and chloride ions. The compound shows antiferromagnetic spin ordering below the Neel temperature with C-type spin structure.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Kashifa Fazl-Ur-Rahman, Ganga Periyasamy
Summary: Density functional theory was used to investigate the structure and reactivity of various perovskite materials, including iron-doped perovskites and perovskites with oxygen vacancies. The study revealed stable structures and potential applications of these materials.
JOURNAL OF SOLID STATE CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Taesu Park, Wang Ro Lee, Won-Joon Son, Ji-Hoon Shim, Changhoon Lee
Summary: By investigating the spin exchange interactions and spin-orbit coupling effect, the magnetic structure and the origin of band gap opening for Ba2CuOsO6 were revealed. It was found that Ba2CuOsO6 is a magnetic insulator, with the spin exchange interaction between Cu ions playing a major role in its antiferromagnetic behavior. The insulating behavior of Ba2CuOsO6 is also closely related to the structural distortion shape of the OsO6 octahedron.
Article
Chemistry, Multidisciplinary
Seongjoon Lim, Shangke Pan, Kefeng Wang, Alexey Ushakov, Ekaterina Sukhanova, Zakhar Popov, Dmitry G. Kvashnin, Sergey Streltsov, Sang-Wook Cheong
Summary: By cleaving metallic Co-1/3 NbS2, researchers have demonstrated the ability to obtain a layer of controllable atomic charges on a periodic lattice and manipulate them to form a linear chain, which can be generalized to other combinations of intercalants and base matrices.
Article
Physics, Applied
V. Yu Irkhin, S. Streltsov
Summary: This article presents a survey of the scientific and social activities of S. V. Vonsovsky, reviewing his fundamental works on the theory of electronic properties and magnetism of transition and rare-earth metals and their compounds. It also considers the historical development of the many-electron polar and s - d(f) exchange models.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2022)
Article
Chemistry, Inorganic & Nuclear
Dmitry A. Zamyatin, Elizaveta A. Pankrushina, Sergey V. Streltsov, Yuri S. Ponosov
Summary: We investigated the lattice dynamics of AuAgTe4 mineral using Raman spectroscopy and first-principle calculations over a wide temperature and pressure range. The experimental spectrum at ambient pressure matches well with the calculation data. The temperature dependence of the phonon self-energies indicates an anharmonic mechanism and negligible electron-phonon interaction at low temperatures. A structural phase transition was observed at 4-6 GPa, in agreement with theoretical predictions. At higher pressures, evidence of local structural disorder was found, allowing for the experimental observation of the density of vibrational states of AuAgTe4, which exhibits superconductivity under pressure.
Article
Materials Science, Multidisciplinary
E. Vavilova, T. Vasilchikova, A. Vasiliev, D. Mikhailova, V. Nalbandyan, E. Zvereva, S. Streltsov
Summary: Recent theoretical studies suggest that Kitaev physics and spin-liquid states can be found not only in alpha-RuCl3 and iridates, but also in traditional 3d transition metal compounds. Through various measurements like magnetometry, thermodynamics, and NMR, the material Na3Co2SbO6 was investigated, revealing a comprehensive phase diagram. The results show the antiferromagnetic structure transforms under an external magnetic field, gradual development of saturation phase, and evidence of gapped behavior in certain regions of the phase diagram.
Article
Materials Science, Multidisciplinary
I. V. Solovyev, A. V. Ushakov, S. V. Streltsov
Summary: On-site Coulomb repulsion and Stoner coupling are both important in determining the magnetic properties of Mott insulators. However, the quantitative description of the ligand-related contributions remains disputed.
Article
Materials Science, Multidisciplinary
Pavel A. Maksimov, Alexey V. Ushakov, Zlata V. Pchelkina, Ying Li, Stephen M. Winter, Sergey V. Streltsov
Summary: By analyzing the electronic structure of the honeycomb material BaCo2(AsO4)2 using two complementary ab initio-based approaches, we find that the dominant direct hopping makes the bond-dependent Kitaev term negligible, deviating the material from the sought-after spin-liquid regime. We propose a simple three-parameter exchange model to describe the interactions of the lowest doublet and discover that the third-neighbor interactions are responsible for the unique ground state of BaCo2(AsO4)2, stabilized by quantum fluctuations.
Article
Materials Science, Multidisciplinary
Sergey Streltsov, Fedor Temnikov, Kliment Kugel, Daniel Khomskii
Summary: This study investigates the interplay between orbital degeneracy and spin-orbit coupling (SOC), revealing the emergence of spinorbital entangled states, known as the cooperative Jahn-Teller (JT) effect, in concentrated systems. Using the specific example of electrons occupying triply degenerate single-ion t(2g) levels and trigonal vibrations (the t circle times T problem), it is found that the outcome of this interaction depends crucially on the occupation of t(2g) levels, leading to either the suppression or enhancement of the JT effect by SOC. The more general electron-lattice interaction involving both tetragonal and trigonal vibrations is also considered.
Article
Chemistry, Physical
Alexey O. Shorikov, Sergey Streltsov
Summary: The many-body effects have a significant impact on the electronic, magnetic, and structural stability of Fe2O, leading to changes in the phase diagram and lowering the critical pressure for structural transitions.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
I. Solovyev, S. A. Nikolaev, A. Ushakov, V. Yu Irkhin, A. Tanaka, S. Streltsov
Summary: Based on density functional theory, this study examines the ferromagnetism in Co3Sn2S2, finding that it has a dual nature with aspects of both itinerancy and localization. Local magnetic moments strongly depend on temperature and angles at Co sites, while ligand states play an important role. Decreasing local moments lead to decreased interplane interactions and instability of the ferromagnetic order.
Article
Materials Science, Multidisciplinary
Elizaveta A. Pankrushina, Alexey Ushakov, Mohsen M. Abd-Elmeguid, Sergey Streltsov
Summary: By using ab initio band structure calculations, it has been shown that mineral cubanite, CuFe2S3, exhibits an orbital-selective behavior where some of the electrons occupy molecular orbitals of x(2) - y(2) symmetry while others are localized at atomic orbitals. This rare behavior in 3d transition metal compounds explains the absence of charge disproportionation, anomalous Mossbauer data, and the presence of ferromagnetic ordering between nearest-neighbor Fe ions.
