Article
Materials Science, Ceramics
Matheus Pianassola, Madeline Loveday, Rebecca Lalk, Kimberly Pestovich, Charles L. Melcher, Mariya Zhuravleva
Summary: High-entropy rare-earth monoclinic aluminate crystals were successfully grown using directional solidification and the micro-pulling-down method for the first time. Five compositions with the formula RE4Al2O9, where RE is an equiatomic mixture of five rare-earth elements, were used. The crystals were found to have a single monoclinic phase and their lattice parameters increased with increasing average ionic radii. One crystal exhibited a high-temperature phase transition, accompanied by lattice contraction upon heating. Electron probe microanalysis revealed Al-rich inclusions and crystals containing Tb had dark surface features that became lighter after annealing in a reducing atmosphere.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Kowsik Ghosh, M. Mangir Murshed, Michael Fischer, Thorsten M. Gesing
Summary: Mullite-type RAlGeO5 phases exhibit interesting structural, spectroscopic, and thermal properties, including rare inversion of Al/Ge between coordination sites. They are high bandgap semiconductors with a high decomposition temperature.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Energy & Fuels
Hao Wang, Xiaojun Wang, Gang Li, Huachang Ye, Cheng Zhang, Lingbo Zhou
Summary: This study investigates the strength evolution characteristics of ion-adsorbed rare-earth ores during the leaching process. Experimental results show that ion exchange and particle migration during leaching lead to changes in the pore structure and pore size of the samples, resulting in a decline in the shear strength parameter of the rare-earth ores.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2023)
Article
Chemistry, Multidisciplinary
Nikita Tepliakov, QuanSheng Wu, Oleg Yazyev
Summary: In this study, the intrinsic polarization and screening of multilayer graphene under an external electric field were investigated using density functional theory and the Wannier function formalism. It was found that multilayer graphene is intrinsically polarized due to the crystal field effect, which is often overlooked in tight-binding models. Different out-of-plane alignments were observed in ordered and twisted graphene multilayers, with a much stronger in-plane potential modulation in the twisted systems. Our findings provide insights into intrinsic and extrinsic polarization in graphene multilayers and offer parameters necessary for accurate modeling of these systems.
Review
Chemistry, Inorganic & Nuclear
Juan Chen, Hongyi Gao, Zhiping Tao, Linmeng Wang, Rushuo Li, Ge Wang
Summary: The synergistic effects of mixed-metal MOFs offer a promising platform to overcome the limitations of traditional monometallic MOFs and achieve superior performance. Mixed-rare earth-based metal-organic frameworks (MRE MOFs) have attracted significant attention due to their intriguing structure, high coordination numbers of rare-earth metal clusters, and unique functional properties. However, the precise characterization of mixed metals in MRE MOFs poses a challenge, especially for those with multi-valent rare-earth metal nodes. This review summarizes recent progress in the preparation and characterization techniques of MRE MOFs, as well as their applications in catalysis, adsorption decontamination, and luminescence, with a focus on the effects of different metals on their structure and properties.
COORDINATION CHEMISTRY REVIEWS
(2023)
Article
Multidisciplinary Sciences
Linyang Li, Fangyun Lu, Wenqi Xiong, Yu Ding, Yangyi Lu, Yao Xiao, Xin Tong, Yao Wang, Shuangfeng Jia, Jianbo Wang, Rafael G. Mendes, Mark H. Ruemmeli, Shengjun Yuan, Mengqi Zeng, Lei Fu
Summary: We have successfully synthesized high-quality 2D rare-earth oxide (REO) single crystals with tailorable facets by designing a hard-soft-acid-base couple to control the orientation growth and crystal facets. This breakthrough provides a foundation for investigating facet-dependent properties and exploring various applications of 2D REO.
NATIONAL SCIENCE REVIEW
(2022)
Review
Chemistry, Multidisciplinary
Yao He, Weiqiang Zhou, Jingkun Xu
Summary: Supercapacitors can effectively address the problems of energy shortage and greenhouse effect. Rare earth (RE) elements or compounds added to electrode materials greatly enhance their electrochemical performance. However, comprehensive surveys on RE-based nanomaterials for supercapacitors are lacking. This review provides a comprehensive overview of RE-based nanomaterials, including preparation methods, nanostructure engineering, compounds, and composites, along with their capacitance performances. The structure-activity relationships are discussed, and future challenges and perspectives are highlighted. This review not only guides the further development of supercapacitors but also sparks interest in RE-based nanomaterials in other research fields.
Review
Materials Science, Multidisciplinary
Jing Qiao, Lutong Li, Jiurong Liu, Na Wu, Wei Liu, Fan Wu, Zhihui Zeng
Summary: Rare earth plays a crucial role in electromagnetic wave absorption materials, and the strategies of doping rare earth elements and constructing rare earth oxide composites are important for the fabrication of high-efficiency electromagnetic wave absorption materials. This review provides a comprehensive summary of the research background, classification, features, progress, and future development of rare earth electromagnetic wave absorption materials, offering guidance for future development.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2024)
Review
Chemistry, Inorganic & Nuclear
Subramani Supriya
Summary: Rare earth-coordinated titanium pyrochlores are important materials for electronic applications in inorganic ceramics. These titanate pyrochlores exhibit high ionic conductivity, low activation energy, chemical stability, mechanical integrity, and compatibility with electrode materials. They are suitable for electrolyte applications and competitive in high-temperature solid oxide fuel cells. This review article summarizes the crystal structure, coordination chemistry of rare earth elements, and various properties, including dielectric response, of pyrochlore materials. It also highlights their microcrystalline structures and recent advancements, introduces and evaluates rare earth pyrochlore titanates applications, and discusses future developments and doping strategies.
COORDINATION CHEMISTRY REVIEWS
(2023)
Article
Engineering, Chemical
Bangyu Fan, Fujian Li, Yanyan Cheng, Zhongzhi Wang, Nian Zhang, Qingrong Wu, Lu Bai, Xiangping Zhang
Summary: The separation of rare earth elements has been a challenge due to their chemical and physical similarities. A new method using magnetic field-enhanced crystallization has been developed to efficiently separate these elements at room temperature and pressure.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Chemical
Bangyu Fan, Fujian Li, Yanyan Cheng, Zhongzhi Wang, Nian Zhang, Qingrong Wu, Lu Bai, Xiangping Zhang
Summary: The separation of rare earth elements has always been challenging due to their similar chemical and physical properties. A potential alternative method called magnetic separation, which utilizes the difference in magnetic moment, has shown efficient separation of rare earth elements at room temperature and pressure.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Review
Environmental Sciences
Payam Rasoulnia, Robert Barthen, Aino-Maija Lakaniemi
Summary: Rare earth elements (REEs) are important high-tech materials with a high risk of supply disruption. Bioleaching as an alternative technology for the recovery and recycling of REEs from various sources has potential applications in the future.
CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2021)
Article
Biotechnology & Applied Microbiology
Michael Paper, Max Koch, Patrick Jung, Michael Lakatos, Tom Nilges, Thomas B. Brueck
Summary: This study investigated the potential of 12 cyanobacterial strains for biosorption of rare earth elements, and Nostoc sp. 20.02 showed the highest adsorption capacity. Synechococcus elongatus UTEX 2973, Calothrix brevissima SAG 34.79, Desmonostoc muscorum 90.03, and Komarekiella sp. 89.12 were also promising strains. The adsorption of metals by the strains had fast kinetics and pH value had a significant impact on the process.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2023)
Article
Engineering, Chemical
Samir Prioto Tayar, Mauricio Cesar Palmieri, Denise Bevilaqua
Summary: This study proposes a alternative approach for the production of sulfuric acid using sulfur-oxidizing microorganisms, which shows potential application even in remote areas. The results indicate that Acidithiobacillus thiooxidans has higher sulfuric acid production compared to other consortia, making it suitable for bioleaching of rare earth elements (REEs) from phosphogypsum. The two-step bioleaching condition resulted in higher REEs extraction compared to one-step bioleaching.
MINERALS ENGINEERING
(2022)
Article
Metallurgy & Metallurgical Engineering
Weiqin Tang, Jeong Yeon Lee, Huamiao Wang, Dirk Steglich, Dayong Li, Yinghong Peng, Peidong Wu
Summary: The unloading behaviors of the rare-earth magnesium alloy ZE10 sheet were studied using mechanical tests and crystal plasticity modeling. The study found significant anisotropy and loading path dependency in the unloading behaviors of ZE10 sheets. Inelastic strains varied under different loading conditions, with basal slip, twinning, and de-twinning being responsible for the behaviors.
JOURNAL OF MAGNESIUM AND ALLOYS
(2021)
Article
Physics, Multidisciplinary
Andrii Sotnikov, Kyo-Hoon Ahn, Jan Kunes
Article
Physics, Condensed Matter
K. Knizek, P. Novak, Z. Jirak
Summary: Through ab-initio electronic structure calculations, we have identified the magnetic exchange integrals in e-Fe2O3, confirming its antiferromagnetic ground state structure. The strong exchange integral within the Fe4 sublattice, resulting in the fastest decrease of the ordered magnetic moment with increasing temperature, leads to an uncompensated antiferromagnetic arrangement.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Physics, Multidisciplinary
J. Ebad-Allah, S. Rojewski, M. Voest, G. Eickerling, W. Scherer, E. Uykur, Raman Sankar, L. Varrassi, C. Franchini, K. -H. Ahn, J. Kunes, C. A. Kuntscher
Summary: The anisotropic optical response of the layered, nodal-line semimetal ZrSiS under different pressures was investigated, showing strong pressure-induced effects on the out-of-plane optical conductivity spectrum. These effects cannot be explained by structural phase transitions or electronic correlations, and are related to the excitonic insulator phase proposed in ZrSiS.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
D. Takegami, C-Y Kuo, K. Kasebayashi, J-G Kim, C. F. Chang, C. E. Liu, C. N. Wu, D. Kasinathan, S. G. Altendorf, K. Hoefer, F. Meneghin, A. Marino, Y. F. Liao, K. D. Tsuei, C. T. Chen, K-T Ko, A. Guenther, S. G. Ebbinghaus, J. W. Seo, D. H. Lee, G. Ryu, A. C. Komarek, S. Sugano, Y. Shimakawa, A. Tanaka, T. Mizokawa, J. Kunes, L. H. Tjeng, A. Hariki
Summary: We present a comprehensive study of CaCu3Ru4O12 using bulk sensitive hard and soft x-ray spectroscopy combined with local-density approximation + dynamical mean-field theory (DMFT) calculations. Correlation effects on both the Cu and Ru ions can be observed. Based on the analysis of Cu 2p corelevel spectra, we infer the presence of magnetic Cu2+ ions hybridized with itinerant electrons. The photon energy dependence of the valence band allows us to optimize the DMFT calculations, indicating that CaCu3Ru4O12 can be classified as a Kondo system with a Kondo temperature in the range of 500-1000 K.
Article
Physics, Multidisciplinary
Keisuke Higashi, Mathias Winder, Jan Kunes, Atsushi Hariki
Summary: By studying the core-level spectra, the optimal model parameters for the ground state of NdNiO2 were determined, showing that self-doping from the Nd 5d states prevents the opening of a Mott-Hubbard gap. However, the current calculations for LaNiO2 cannot explain the difference in spectra compared to NdNiO2.
Article
Multidisciplinary Sciences
M. C. Rahn, K. Kummer, A. Hariki, K-H Ahn, J. Kunes, A. Amorese, J. D. Denlinger, D-H Lu, M. Hashimoto, E. Rienks, M. Valvidares, F. Haslbeck, D. D. Byler, K. J. McClellan, E. D. Bauer, J. X. Zhu, C. H. Booth, A. D. Christianson, J. M. Lawrence, F. Ronning, M. Janoschek
Summary: Resonant inelastic X-ray scattering (RIXS) was used in this study to investigate CePd3 and clarify the hybridization process between local high-energy degrees of freedom and the underlying metallic state at low temperature, highlighting its impact on the properties of correlated metals.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Kyo-Hoon Ahn, Jakub Vit, Mariia Pashchenko, Karel Knizek
Summary: The anomalous Nernst effect in substituted iron nitrides with antiperovskite structure is studied using ab initio calculations. The highest anomalous Nernst conductivity is observed in ruthenium substituted ferromagnetic phase Fe3RuN, while a similar maximum conductivity is found in ferrimagnetic phase Fe2RuCrN. These compounds exhibit high ANC values over a wider temperature range and could be potential candidates for high-temperature applications.
Article
Materials Science, Multidisciplinary
Atsushi Hariki, Kyo-Hoon Ahn, Jan Kunes
Summary: The computational study of PbCoO3 at ambient and elevated pressure using DFT+U and DFT+DMFT methods reveals the unsaturated Pb 6s - O 2p bonds as the driving force behind the complex physics of PbCoO3. Geometrical analysis of structural distortions and discussions on internal doping effects triggering phase transitions are provided.
Article
Materials Science, Multidisciplinary
A. Niyazi, D. Geffroy, J. Kunes
Summary: In this study, we explored the dynamical mean-field properties of antiferromagnetic magnons in a one-, two-, and three-orbital Hubbard model under intermediate coupling strength. The effects of anisotropy introduced by external magnetic field or single-ion anisotropy were investigated, with a continuous tuning between easy-axis and easy-plane models. It was found that ordered states and magnetic excitations are sensitive to even small breaking of SU(2) symmetry of the model, in line with spin-wave theory and general symmetry considerations.
Article
Materials Science, Multidisciplinary
Shogo Yamashita, Daiki Suzuki, Takuya Yoshioka, Hiroki Tsuchiura, Pavel Novak
Article
Materials Science, Multidisciplinary
Mathias Winder, Atsushi Hariki, Jan Kunes
Article
Materials Science, Multidisciplinary
A. Niyazi, D. Geffroy, J. Kunes
Article
Materials Science, Multidisciplinary
Atsushi Hariki, Ru-Pan Wang, Andrii Sotnikov, Keisuke Tomiyasu, Davide Betto, Nicholas B. Brookes, Yohei Uemura, Mahnaz Ghiasi, Frank M. F. De Groot, Jan Kunes
Article
Materials Science, Multidisciplinary
Atsushi Hariki, Mathias Winder, Takayuki Uozumi, Jan Kunes
Article
Physics, Multidisciplinary
Hiroshi Shinaoka, Dominique Geffroy, Markus Wallerberger, Junya Otsuki, Kazuyoshi Yoshimi, Emanuel Gull, Jan Kunes