Article
Physics, Fluids & Plasmas
Amir Nourhani, Vincent H. Crespi, Paul E. Lammert
Summary: A nominally two-dimensional spin model wrapped onto a cylinder can be viewed as a one-dimensional chain, with each site being a ring of spins. Traditional correlation functions are inadequate for studying correlations in such systems, and need to be replaced with methods like mutual information. This study investigates correlations and characteristics of cylindrical triangular Ising antiferromagnet models through a fermionic representation.
Article
Physics, Multidisciplinary
F. A. Kassan-Ogly, A. V. Zarubin
Summary: This study investigates the frustration properties of the Ising model on a decorated triangular lattice using the Kramers-Wannier transfer matrix method. It provides expressions for the entropy, heat capacity, and spontaneous magnetization of the lattice, including the residual (zero-temperature) entropy and spontaneous magnetization of the system. The study reveals the existence of magnetic frustrations in the model and their impact on the thermodynamic functions of the system. The most important finding is the potential coexistence of frustrations and long-range magnetic order in partially ordered spin systems.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2023)
Article
Materials Science, Ceramics
Lin Chen, Jiankun Wang, Luyang Zhang, Baihui Li, Keren Luo, Jiang Tian, Hao Xu, Jing Feng
Summary: This perspective outlines the research directions and characteristics of ferroelastic rare-earth tantalates (RETaO4) as multifunctional thermal/environmental barrier coatings (T/EBCs) with high working temperatures. The perspective summarizes the research progress on tantalate coatings synthesized via different methods and highlights the importance of understanding failure mechanisms and establishing synthesis-structure-property relationships for future studies.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Keke Feng, Ian Andreas Leahy, Olatunde Oladehin, Kaya Wei, Minhyea Lee, Ryan Baumbach
Summary: We report the synthesis and magnetic properties of GdAuAl4Ge2 and TbAuAl4Ge2, revealing magnetically ordered states at low temperatures and magnetic fluctuations extending into the paramagnetic region. Rich behavior and phase transitions are observed in the ab-plane under applied magnetic fields. The similarity in phase diagrams between the two compounds suggests that factors such as lattice symmetry or interaction may control the magnetism. Similarities to compounds hosting skyrmion lattices are pointed out, highlighting the interest in the LnAuAl4Ge(2) family as reservoirs for complex magnetism and electronic behaviors.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Michael O. Ogunbunmi, Andre M. Strydom
Summary: Research on magnetic frustration in condensed matter physics is a topic of much interest due to the exploration of various exotic ground states. Rare-earth antiferromagnets serve as a profitable test field for finding candidate quantum spin-liquid. The study explores the strong magnetic frustration-driven ground states in several antiferromagnets due to the arrangements of magnetic ions and their interaction with quantum fluctuations on a Shastry-Sutherland lattice.
MATERIALS TODAY PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
M. Mohylna, M. Zukovic
Summary: In this study, we investigated the effects of single-ion anisotropy on the phase diagram topology and the stability of the skyrmion lattice (SkX) phase in a frustrated antiferromagnetic Heisenberg model on a triangular lattice with Dzyaloshinskii-Moriya interaction (DMI) under an external magnetic field. Phase diagrams were constructed for different strengths of easy-axis and easy-plane anisotropy using parallel tempering Monte Carlo simulations. It was found that the SkX phase can be stabilized within a certain temperature and field range, and both types of anisotropy can have beneficial effects on its stabilization. Metropolis dynamics simulations were also performed to investigate the persistence of the SkX phase. It was confirmed that low temperatures, small DMI, and small easy-plane anisotropy values can increase the lifetime of the skyrmions.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Chemistry, Inorganic & Nuclear
Yuya Haraguchi, Kazuo Kakimoto, Hiroko Aruga Katori
Summary: The crystal structure and magnetic properties of Ru5+ triangular lattice antiferromagnets beta-Li3Mg2RuO6 and Ag3Mg2RuO6 are reported, with discussions on polymorphism under different synthesis conditions. Heat capacity measurements show antiferromagnetic ordering at 13 K and 24 K in beta-Li3Mg2RuO6 and Ag3Mg2RuO6, respectively.
JOURNAL OF SOLID STATE CHEMISTRY
(2021)
Article
Chemistry, Physical
Evgeniya Vavilova, Timur Salikhov, Margarita Iakovleva, Tatyana Vasilchikova, Elena Zvereva, Igor Shukaev, Vladimir Nalbandyan, Alexander Vasiliev
Summary: The structural and magnetic properties of Li0.8Ni0.6Sb0.4O2 were studied, revealing the formation of a new phase and significant changes in magnetic properties compared to the stoichiometric partner.
Review
Materials Science, Multidisciplinary
Michael O. Ogunbunmi, Harikrishnan S. Nair, Andre M. Strydom
Summary: Studying the magnetic, thermodynamic, and transport properties of Gd3Ru4Al12 structure type compounds is important for exploring various magnetic frustration-driven exotic states of matter, and has potential practical applications.
CRITICAL REVIEWS IN SOLID STATE AND MATERIALS SCIENCES
(2023)
Article
Physics, Multidisciplinary
S. Oliveira, J. P. Santos
Summary: In this study, the magnetic properties of the Ising spin-1/2 antiferromagnetic model on the kagome lattice were investigated using a hybrid Hamiltonian. The research revealed the characteristics of a frustrated system when subjected to an external field, showing magnetization plateaus on the curves. Furthermore, exotic states of matter such as magnetic charges in the kagome lattice were observed through a hexagonal sublattice using the spin/charge hybrid model.
Article
Physics, Multidisciplinary
Jiabin Liu, Benqiong Liu, Long Yuan, Boqiang Li, Lei Xie, Xiping Chen, Hongxia Zhang, Daye Xu, Wei Tong, Jinchen Wang, Yuesheng Li
Summary: This study investigates frustrated magnetism on delafossite oxides, where easy-axis anisotropy competes with 120 degree Neel order, resulting in enhanced quantum spin fluctuations at low temperatures.
NEW JOURNAL OF PHYSICS
(2021)
Article
Materials Science, Ceramics
Chen Li, Bin Meng, Sining Fan, Xinyu Ping, Congcong Fang, Wu Lin, Yingquan Chen, Han Zhang
Summary: A series of rare-earth-tantalate high-entropy ceramics with an orthogonal structure and slow grain growth were prepared. These ceramics exhibit low thermal conductivity and high fracture toughness, making them promising candidates for thermal barrier coatings.
CERAMICS INTERNATIONAL
(2022)
Article
Physics, Condensed Matter
Anton A. Kulbakov, Stanislav M. Avdoshenko, Ines Puente-Orench, Mahmoud Deeb, Mathias Doerr, Philipp Schlender, Thomas Doert, Dmytro S. Inosov
Summary: Yb- and Ce-based delafossites have been identified as effective spin-1/2 antiferromagnets on the triangular lattice. While Yb-based systems show no long-range order at the lowest temperatures and are considered candidates for quantum spin liquids, their Ce-based counterpart KCeS2 exhibits magnetic order below 400 mK. Magnetic neutron diffraction revealed a 'stripe-yz' type antiferromagnetic order for KCeS2 with spins lying in triangular-lattice planes orthogonal to the nearest-neighbor Ce-Ce bonds.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Chemistry, Physical
Armando Galluzzi, Giuseppe Cuono, Alfonso Romano, Jianlin Luo, Carmine Autieri, Canio Noce, Massimiliano Polichetti
Summary: The magnetic response of a frustrated K2Cr3As3 sample with triangular arrays of twisted tubes has been studied. The sample exhibited diamagnetic behavior at temperatures above 60 K and ferrimagnetic behavior at lower temperatures. Spike-like magnetization jumps were observed around 800 Oe regardless of temperature and were compared with theoretical predictions on frustrated systems. The distribution of the magnetization jumps can be described by a Lorentzian curve, suggesting that they could be attributed to magnetic frustration arising from the twisted triangular tubes in the crystal lattice.
Article
Materials Science, Ceramics
Jun Wang, Qianqian Jin, Jianbo Song, Di Zhang, Bin Xu, Zhiyi Ren, Meng Wang, Shixiao Yan, Xiaoliang Sun, Chi Liu, Xiaoyu Chong, Jing Feng
Summary: The objective of this research is to optimize the thermophysical properties of rare-earth tantalates using an entropy strategy. The stabilizing structure of seven-component rare-earth tantalates is confirmed, and an entropy-stabilized compound with a defective structure is synthesized. The compound exhibits lower thermal conductivity and superior high-temperature phase stability and mechanical properties.
CERAMICS INTERNATIONAL
(2023)
Article
Physics, Condensed Matter
M. Y. Ruan, Y. H. Li, L. Wang, Z. W. Ouyang, H. S. Chen, Y. Z. Zheng
SOLID STATE COMMUNICATIONS
(2020)
Article
Chemistry, Physical
M. Y. Ruan, C. Q. Yang, L. Wang, P. B. Jin, Z. L. Guo, X. L. Wei, W. X. Wu
Summary: The magnetization and electron spin resonance in nanocrystals of antiferromagnet GdVO4 were investigated, showing enhanced paramagnetic-like behavior with smaller grain sizes. Further reduction in grain size to around 30 nm resulted in dramatic decrease in saturation magnetization and negative entropy change. The aggregation effect was believed to be responsible for this decline.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Physics, Condensed Matter
Yongming Zhao, Lei Wang, Jiandong Liu, Dandan Lei, Zhongwen Ouyang
Summary: The magnetic and magnetocaloric properties of two Gd-based compounds are reported. Both compounds exhibit a large magnetic entropy change and no thermal or field hysteresis, making them potential candidates for low-temperature magnetocaloric materials.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Crystallography
Mingyue Ruan, Lei Wang, Yuhong Li, Zhongwen Ouyang, Hongshan Chen, Yanzhen Zheng
CRYSTAL RESEARCH AND TECHNOLOGY
(2020)
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)