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Search Results (942)

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Keywords = Lanthanides

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12 pages, 3641 KiB  
Article
Metallic Lanthanum (III) Hybrid Magnetic Nanocellulose Composites for Enhanced DNA Capture via Rare-Earth Coordination Chemistry
by Jiayao Yang, Jie Fei, Hongpeng Wang and Ye Li
Inorganics 2025, 13(8), 257; https://doi.org/10.3390/inorganics13080257 - 1 Aug 2025
Viewed by 110
Abstract
Lanthanide rare earth elements possess significant promise for material applications owing to their distinctive optical and magnetic characteristics, as well as their versatile coordination capabilities. This study introduced a lanthanide-functionalized magnetic nanocellulose composite (NNC@Fe3O4@La(OH)3) for effective phosphorus/nitrogen [...] Read more.
Lanthanide rare earth elements possess significant promise for material applications owing to their distinctive optical and magnetic characteristics, as well as their versatile coordination capabilities. This study introduced a lanthanide-functionalized magnetic nanocellulose composite (NNC@Fe3O4@La(OH)3) for effective phosphorus/nitrogen (P/N) ligand separation. The hybrid material employs the adaptable coordination geometry and strong affinity for oxygen of La3+ ions to show enhanced DNA-binding capacity via multi-site coordination with phosphate backbones and bases. This study utilized cellulose as a carrier, which was modified through carboxylation and amination processes employing deep eutectic solvents (DES) and polyethyleneimine. Magnetic nanoparticles and La(OH)3 were subsequently incorporated into the cellulose via in situ growth. NNC@Fe3O4@La(OH)3 showed a specific surface area of 36.2 m2·g−1 and a magnetic saturation intensity of 37 emu/g, facilitating the formation of ligands with accessible La3+ active sites, hence creating mesoporous interfaces that allow for fast separation. NNC@Fe3O4@La(OH)3 showed a significant affinity for DNA, with adsorption capacities reaching 243 mg/g, mostly due to the multistage coordination binding of La3+ to the phosphate groups and bases of DNA. Simultaneously, kinetic experiments indicated that the binding process adhered to a pseudo-secondary kinetic model, predominantly dependent on chemisorption. This study developed a unique rare-earth coordination-driven functional hybrid material, which is highly significant for constructing selective separation platforms for P/N-containing ligands. Full article
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19 pages, 1698 KiB  
Review
Marine Rare Earth Elements: Distribution Patterns, Enrichment Mechanisms and Microbial Interactions
by Shun Liu and Yinan Deng
J. Mar. Sci. Eng. 2025, 13(8), 1471; https://doi.org/10.3390/jmse13081471 - 31 Jul 2025
Viewed by 210
Abstract
Rare earth elements and yttrium (REY) are critical metals underpinning high-technology industries. Marine deposits have attracted growing interest due to their abundant REY reserves and high grades. This review synthesizes current knowledge on sources, distribution, and enrichment mechanisms of marine REY, with a [...] Read more.
Rare earth elements and yttrium (REY) are critical metals underpinning high-technology industries. Marine deposits have attracted growing interest due to their abundant REY reserves and high grades. This review synthesizes current knowledge on sources, distribution, and enrichment mechanisms of marine REY, with a particular focus on the role of microorganisms in REY phase transitions, fractionation, and enrichment. We highlight the largely untapped potential of marine-specific microbial strains and critically assess their influence on REY cycling. Key research challenges are proposed, followed by actionable directions to advance understanding of microbial–REY interactions. This review aims to deepen insights into marine REY cycling and support the sustainable development of deep-sea REY resources, emphasizing the need to integrate molecular-scale microbial processes into marine REY biogeochemical models. Full article
(This article belongs to the Section Geological Oceanography)
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17 pages, 6360 KiB  
Article
Integrating Lanthanide-Reclaimed Wastewater and Lanthanide Phosphate in Corn Cultivation: A Novel Approach for Sustainable Agriculture
by George William Kajjumba, Savanna Vacek and Erica J. Marti
Sustainability 2025, 17(15), 6734; https://doi.org/10.3390/su17156734 - 24 Jul 2025
Viewed by 316
Abstract
With increasing global challenges related to water scarcity and phosphorus depletion, the recovery and reuse of wastewater-derived nutrients offer a sustainable path forward. This study evaluates the dual role of lanthanides (Ce3+ and La3+) in recovering phosphorus from municipal wastewater [...] Read more.
With increasing global challenges related to water scarcity and phosphorus depletion, the recovery and reuse of wastewater-derived nutrients offer a sustainable path forward. This study evaluates the dual role of lanthanides (Ce3+ and La3+) in recovering phosphorus from municipal wastewater and supporting corn (Zea mays) cultivation through lanthanide phosphate (Ln-P) and lanthanide-reclaimed wastewater (LRWW, wastewater spiked with lanthanide). High-purity precipitates of CePO4 (98%) and LaPO4 (92%) were successfully obtained without pH adjustment, as confirmed by X-ray photoelectron spectroscopy (XPS) and energy-dispersive spectroscopy (EDS). Germination assays revealed that lanthanides, even at concentrations up to 2000 mg/L, did not significantly alter germination rates compared to traditional coagulants, though root and shoot development declined above this threshold—likely due to reduced hydrogen peroxide (H2O2) production and elevated total dissolved solids (TDSs), which induced physiological drought. Greenhouse experiments using desert-like soil amended with Ln-P and irrigated with LRWW showed no statistically significant differences in corn growth parameters—including plant height, stem diameter, leaf number, leaf area, and biomass—when compared to control treatments. Photosynthetic performance, including stomatal conductance, quantum efficiency, and chlorophyll content, remained unaffected by lanthanide application. Metal uptake analysis indicated that lanthanides did not inhibit phosphorus absorption and even enhanced the uptake of calcium and magnesium. Minimal lanthanide accumulation was detected in plant tissues, with most retained in the root zone, highlighting their limited mobility. These findings suggest that lanthanides can be safely and effectively used for phosphorus recovery and agricultural reuse, contributing to sustainable nutrient cycling and aligning with the United Nations’ Sustainable Development Goals of zero hunger and sustainable cities. Full article
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23 pages, 4192 KiB  
Article
Efficacy of Various Complexing Agents for Displacing Biologically Important Ligands from Eu(III) and Cm(III) Complexes in Artificial Body Fluids—An In Vitro Decorporation Study
by Sebastian Friedrich, Antoine Barberon, Ahmadabdurahman Shamoun, Björn Drobot, Katharina Müller, Thorsten Stumpf, Jerome Kretzschmar and Astrid Barkleit
Int. J. Mol. Sci. 2025, 26(15), 7112; https://doi.org/10.3390/ijms26157112 - 23 Jul 2025
Cited by 1 | Viewed by 323
Abstract
Incorporation of lanthanide (Ln) and actinide (An) ions into the human body poses significant chemotoxic and radiotoxic risks, necessitating effective decorporation strategies. This study investigates the displacement of biologically relevant ligands from trivalent ions of europium, Eu(III), and curium, Cm(III), in artificial biofluids [...] Read more.
Incorporation of lanthanide (Ln) and actinide (An) ions into the human body poses significant chemotoxic and radiotoxic risks, necessitating effective decorporation strategies. This study investigates the displacement of biologically relevant ligands from trivalent ions of europium, Eu(III), and curium, Cm(III), in artificial biofluids by various complexing agents, i.e., ethylenediaminetetraacetic acid (EDTA), ethylene glycol-bis(β-aminoethyl ether)-N,N,N′,N′-tetraacetic acid (EGTA), diethylenetriaminepentaacetic acid (DTPA), and spermine-based hydroxypyridonate chelator 3,4,3-LI(1,2-HOPO) (HOPO). Utilizing a modified unified bioaccessibility method (UBM) to simulate gastrointestinal conditions, we conducted concentration-dependent displacement experiments at both room and body temperatures. Time-resolved laser-induced fluorescence spectroscopy (TRLFS) supported by 2H nuclear magnetic resonance (NMR) spectroscopy and thermodynamic modelling revealed the complexation efficacy of the agents under physiological conditions. Results demonstrate that high affinity, governed by complex stability constants and ligand pKa values, is critical to overcome cation and anion competition and leads to effective decorporation. Additionally, there is evidence that cyclic ligands are inferior to linear ligands for this application. HOPO and DTPA exhibited superior displacement efficacy, particularly in the complete gastrointestinal tract simulation. This study highlights the utility of in vitro workflows for evaluating decorporation agents and emphasizes the need for ligands with optimal binding characteristics for enhanced chelation therapies. Full article
(This article belongs to the Special Issue Toxicity of Heavy Metal Compounds)
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22 pages, 4411 KiB  
Article
Synthesis, Structural Characterization, and In Silico Antiviral Prediction of Novel DyIII-, YIII-, and EuIII-Pyridoxal Helicates
by Francisco Mainardi Martins, Yuri Clemente Andrade Sokolovicz, Morgana Maciél Oliveira, Carlos Serpa, Otávio Augusto Chaves and Davi Fernando Back
Inorganics 2025, 13(8), 252; https://doi.org/10.3390/inorganics13080252 - 23 Jul 2025
Viewed by 404
Abstract
The synthesis and structural characterization of three new triple-stranded helical complexes ([Dy2(L2)3]2Cl∙15H2O (C1), [Y2(L2)3]3(NO3)Cl∙14H2O∙DMSO (C2), and [Eu2(L4) [...] Read more.
The synthesis and structural characterization of three new triple-stranded helical complexes ([Dy2(L2)3]2Cl∙15H2O (C1), [Y2(L2)3]3(NO3)Cl∙14H2O∙DMSO (C2), and [Eu2(L4)3]∙12H2O (C3), where L2 and L4 are ligands derived from pyridoxal hydrochloride and succinic or adipic acid dihydrazides, respectively, were described. The X-ray data, combined with spectroscopic measurements, indicated that L2 and L4 act as bis-tridentate ligands, presenting two tridentate chelating cavities O,N,O to obtain the dinuclear complexes C1C3. Their antiviral profile was predicted via in silico calculations in terms of interaction with the structural severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) spike glycoprotein in the down- and up-states and complexed with the cellular receptor angiotensin-converting enzyme 2 (ACE2). The best affinity energy values (−9.506, −9.348, and −9.170 kJ/mol for C1, C2, and C3, respectively) were obtained for the inorganic complexes docked in the model spike-ACE2, with C1 being suggested as the most promising candidate for a future in vitro validation. The obtained in silico antiviral trend was supported by the prediction of the electronic and physical–chemical properties of the inorganic complexes via the density functional theory (DFT) approach, representing an original and relevant contribution to the bioinorganic and medicinal chemistry fields. Full article
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15 pages, 4160 KiB  
Article
Investigation of the Structure and Electrochemical Performance of Perovskite Oxide La1−xCaxCrO3 Utilized as Electrode Materials for Supercapacitors
by Xu Guo, Xin Sun, Lei Wang, Yanxin Qiao and Songtao Dong
Coatings 2025, 15(7), 837; https://doi.org/10.3390/coatings15070837 - 17 Jul 2025
Viewed by 559
Abstract
Lanthanide perovskite materials are promising candidates for supercapacitor applications. In this study, a series of La1−xCaxCrO3 (x = 0–0.2) materials were prepared by sol-gel method, incorporating bivalent ions calcium at A-site. La0.85Ca0.15CrO3 exhibited [...] Read more.
Lanthanide perovskite materials are promising candidates for supercapacitor applications. In this study, a series of La1−xCaxCrO3 (x = 0–0.2) materials were prepared by sol-gel method, incorporating bivalent ions calcium at A-site. La0.85Ca0.15CrO3 exhibited the lowest charge transfer resistance and highest specific surface area. At 1 A/g, La0.85Ca0.15CrO3 achieved a maximum specific capacitance of 306 F/g, about 2.3 times higher than that of the LaCrO3 (133 F/g). Based on the observed data, a mechanism involving oxygen anion charge storage during the charging-discharging process is proposed. After 5000 long cycle, the coulomb efficiency of the electrode remains above 94%. These results demonstrate that Ca-substituted compounds exhibit significant potential for A-site engineering in supercapacitor applications. Full article
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14 pages, 5036 KiB  
Article
Intermolecular Charge Transfer Induced Sensitization of Yb3+ in β-Diketone Coordination Compounds with Excellent Luminescence Efficiency
by Trofim A. Polikovskiy, Daniil D. Shikin, Vladislav M. Korshunov, Victoria E. Gontcharenko, Mikhail T. Metlin, Nikolay P. Datskevich, Marat M. Islamov, Victor O. Kompanets, Sergey V. Chekalin, Yuriy A. Belousov and Ilya V. Taydakov
Int. J. Mol. Sci. 2025, 26(14), 6814; https://doi.org/10.3390/ijms26146814 - 16 Jul 2025
Viewed by 224
Abstract
Achieving high quantum yields for Yb3+ ion emission in complexes with organic ligands is a challenging task, as most Yb3+ complexes with such ligands typically exhibit efficiencies below 3.5%. Our research demonstrates that the introduction of heavy atom-containing ancillary ligands, such [...] Read more.
Achieving high quantum yields for Yb3+ ion emission in complexes with organic ligands is a challenging task, as most Yb3+ complexes with such ligands typically exhibit efficiencies below 3.5%. Our research demonstrates that the introduction of heavy atom-containing ancillary ligands, such as TPPO or TPAO, along with the careful engineering of the main β-diketone ligand, can increase the luminescence efficiency up to 20-fold by the alteration of the energy migration pathway. It is demonstrated that the combination of two distinct organic ligands leads to the blockage of singlet–triplet intersystem crossing (ISC), alongside electronic energy transfer from β-diketone to Yb3+ ions through charge transfer states. The synthesized complexes exhibit quantum yields of 6.5% and 7.0% in the solid state, which places them at the top globally among this class of materials with simple non-deuterated and non-fluorinated ligands. Full article
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35 pages, 9604 KiB  
Review
Multifunctional Upconversion Nanoparticles Transforming Photoacoustic Imaging: A Review
by Yuqian Zhang, Zerui Li, Ziqing Du, Jianming Pan and Yanan Huang
Nanomaterials 2025, 15(14), 1074; https://doi.org/10.3390/nano15141074 - 10 Jul 2025
Viewed by 593
Abstract
Photoacoustic imaging (PAI) merges the high spatial resolution of optical methods with the deep tissue penetration provided by ultrasound, making it a valuable tool in biomedical imaging. In recent years, a diverse array of photoacoustic contrast agents, spanning both organic and inorganic materials, [...] Read more.
Photoacoustic imaging (PAI) merges the high spatial resolution of optical methods with the deep tissue penetration provided by ultrasound, making it a valuable tool in biomedical imaging. In recent years, a diverse array of photoacoustic contrast agents, spanning both organic and inorganic materials, has been developed. Among them, upconversion nanoparticles (UCNPs) stand out as promising candidates due to their unique optical features, tunable absorption in the near-infrared I (NIR-I, 750–1350 nm) region, and strong potential for both imaging and treatment-related uses. This review discusses the growing significance of UCNPs in the field of PAI, focusing on their structural characteristics, strengths, and existing challenges. Then, we talk about an up-to-date account of the current literature on the use of UCNPs as contrast agents for PAI. Lastly, we discuss the challenges and perspectives of UCNPs as a contrast agent for PAI in preclinical research and clinical diagnosis. Full article
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13 pages, 3647 KiB  
Article
Near-Infrared Synaptic Responses of WSe2 Artificial Synapse Based on Upconversion Luminescence from Lanthanide Doped Nanoparticles
by Yaxian Lu, Chuanwen Chen, Qi Sun, Ni Zhang, Kun Lv, Zhiling Chen, Yuelan He, Haowen Tang and Ping Chen
Inorganics 2025, 13(7), 236; https://doi.org/10.3390/inorganics13070236 - 10 Jul 2025
Viewed by 380
Abstract
Near-infrared (NIR) photoelectric synaptic devices show great potential in studying NIR artificial visual systems integrating excellent optical characteristics and bionic synaptic plasticity. However, NIR synapses based on transition metal dichalcogenides (TMDCs) suffer from low stability and poor environmental performance. Thus, an environmentally friendly [...] Read more.
Near-infrared (NIR) photoelectric synaptic devices show great potential in studying NIR artificial visual systems integrating excellent optical characteristics and bionic synaptic plasticity. However, NIR synapses based on transition metal dichalcogenides (TMDCs) suffer from low stability and poor environmental performance. Thus, an environmentally friendly NIR synapse was fabricated based on lanthanide-doped upconversion nanoparticles (UCNPs) and two-dimensional (2D) WSe2 via solution spin coating technology. Biological synaptic functions were simulated successfully through 975 nm laser regulation, including paired-pulse facilitation (PPF), spike rate-dependent plasticity, and spike timing-dependent plasticity. Handwritten digital images were also recognized by an artificial neural network based on device characteristics with a high accuracy of 97.24%. In addition, human and animal identification in foggy and low-visibility surroundings was proposed by the synaptic response of the device combined with an NIR laser and visible simulation. These findings might provide promising strategies for developing a 24/7 visual response of humanoid robots. Full article
(This article belongs to the Section Inorganic Materials)
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26 pages, 2032 KiB  
Review
A Cross-Disciplinary Review of Rare Earth Elements: Deposit Types, Mineralogy, Machine Learning, Environmental Impact, and Recycling
by Mustafa Rezaei, Gabriela Sanchez-Lecuona and Omid Abdolazimi
Minerals 2025, 15(7), 720; https://doi.org/10.3390/min15070720 - 9 Jul 2025
Viewed by 926
Abstract
Rare-earth elements (REEs), including lanthanides, scandium, and yttrium, are important for advanced technologies such as renewable energy systems, electronics, medical diagnostics, and precision agriculture. Despite their relative crustal abundance, REE extraction is impeded by complex geochemical behavior, dispersed distribution, and environmental challenges. This [...] Read more.
Rare-earth elements (REEs), including lanthanides, scandium, and yttrium, are important for advanced technologies such as renewable energy systems, electronics, medical diagnostics, and precision agriculture. Despite their relative crustal abundance, REE extraction is impeded by complex geochemical behavior, dispersed distribution, and environmental challenges. This review presents a comprehensive overview of REE geochemistry, mineralogy, and major deposit types including carbonatites, alkaline igneous rocks, laterites, placer deposits, coal byproducts, and marine sediments. It also highlights the global distribution and economic potential of key REE projects. The integration of machine learning has further enhanced exploration by enabling deposit classification and geochemical modeling, especially in data-limited regions. Environmental and health challenges associated with REE mining, processing, and electronic waste (e-waste) recycling are studied, along with the expanding use of REEs in agriculture and medicine. Some recycling efforts offer promise for supply diversification, but significant technological and economic barriers remain. Ensuring a secure and sustainable REE supply will require integrated approaches combining advanced analytics, machine learning, responsible extraction, and coordinated policy efforts. The present review offers a general overview that can be useful for informing future studies and resource-related discussions. Full article
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14 pages, 2206 KiB  
Article
Neodymium Exerts Biostimulant and Synergistic Effects on the Nutrition and Biofortification of Lettuce with Zinc
by Imelda Rueda-López, Fernando C. Gómez-Merino, María G. Peralta Sánchez and Libia I. Trejo-Téllez
Horticulturae 2025, 11(7), 776; https://doi.org/10.3390/horticulturae11070776 - 2 Jul 2025
Viewed by 343
Abstract
This research aimed to evaluate the effects of different concentrations of neodymium (Nd: 0, 2.885, 5.770, and 8.655 mg L−1, referred to as Nd0, Nd1, Nd2, and Nd3, respectively) and zinc (Zn: 0.1, 0.2, and 0.3 mg L−1, designated [...] Read more.
This research aimed to evaluate the effects of different concentrations of neodymium (Nd: 0, 2.885, 5.770, and 8.655 mg L−1, referred to as Nd0, Nd1, Nd2, and Nd3, respectively) and zinc (Zn: 0.1, 0.2, and 0.3 mg L−1, designated as Zn1, Zn2, and Zn3, respectively), as well as their combined interaction, on the nutritional content of lettuce (Lactuca sativa) cv. Ruby Sky. The seedlings were grown in a floating hydroponic system under greenhouse conditions. After 48 days of treatment, leaf samples were collected to determine their nutrient content. Leaf contents of N, P, Ca, Mg, S, Fe, Mn, B, and Nd were higher with the Nd1 (2.885 mg Nd L−1 + Zn1 (0.1 mg Zn L−1) treatment. The Nd3 (8.655 mg Nd L−1) + Zn3 (0.3 mg Zn L−1) treatment significantly increased the leaf contents of Cu and Zn. The K content was higher in leaves treated with Nd2 (5.770 mg Nd L−1) + Zn3 (0.3 mg Zn L−1). The joint application of Nd and Zn had positive effects on the nutrition of hydroponic lettuce, and Nd promoted the biofortification of lettuce by increasing leaf Zn content. Full article
(This article belongs to the Special Issue Effects of Biostimulants on Horticultural Crop Production)
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13 pages, 6902 KiB  
Article
Influence of Content and Type of Lanthanide on the Structure of Ln2O3-Covered Carbon Nanoflakes: The EPR and XPS Study
by Serguei V. Savilov, Evgeniya V. Suslova, Alexander N. Ulyanov, Konstantin I. Maslakov, Sergey V. Maximov, Denis A. Shashurin and Georgy A. Chelkov
Nanomaterials 2025, 15(13), 1016; https://doi.org/10.3390/nano15131016 - 1 Jul 2025
Viewed by 324
Abstract
Synthesized Ln2O3 (Ln = La, Nd or Gd) nanoparticles with sizes of 1–3 nm, 5–6 nm and 10–15 nm were stabilized by carbon nanoflakes (CNFs). The weight content of Ln2O3 in the Ln2O3/CNF [...] Read more.
Synthesized Ln2O3 (Ln = La, Nd or Gd) nanoparticles with sizes of 1–3 nm, 5–6 nm and 10–15 nm were stabilized by carbon nanoflakes (CNFs). The weight content of Ln2O3 in the Ln2O3/CNF composites was 20–50 wt. %, which makes these composites potentially suitable for practical use as computed tomography and magnetic resonance imaging contrast agents. The structure of CNFs and Ln2O3/CNF composites was investigated by X-ray diffraction data, X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR). The EPR spectra of raw CNFs were silent. The oxidation of the CNF surface resulted in the appearance of paramagnetic centers associated with two types of unpaired electrons in the carbon support. After impregnation of the CNFs with the Ln3+ ion solution, the number of unpaired electrons was reduced, presumably due to the formation of C–O–Ln bonds. All Ln3+ ions changed the composites’ EPR spectra by reducing the number of unpaired electrons in the CNF structure. Full article
(This article belongs to the Section Synthesis, Interfaces and Nanostructures)
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19 pages, 11860 KiB  
Article
Improved Properties of Ceramic Shells by Optimizing the Surface Composition from Lanthanide-Based Composites
by Minghui Li, Jianbo Yu, Xia Li, Zhigang Yang, Zhongming Ren and Xiaoxin Zhang
Coatings 2025, 15(7), 746; https://doi.org/10.3390/coatings15070746 - 23 Jun 2025
Viewed by 410
Abstract
The precision casting of nickel-based single-crystal superalloys imposes stringent requirements on the high-temperature stability and chemical inertness of ceramic shell face coats. To address the issue of traditional EC95 shells (95% Al2O3–5% SiO2) being prone to react [...] Read more.
The precision casting of nickel-based single-crystal superalloys imposes stringent requirements on the high-temperature stability and chemical inertness of ceramic shell face coats. To address the issue of traditional EC95 shells (95% Al2O3–5% SiO2) being prone to react with the alloy melt at elevated temperatures, thereby inducing casting defects, this study proposes a lanthanide oxide-based ceramic face coat material. Three distinct powders—LaAlO3 (LA), LaAlO3/La2Si2O7 (LAS), and LaAl11O18/La2Si2O7/Al2O3 (LA11S)—are successfully prepared through solid-phase sintering of the La2O3-Al2O3-SiO2 ternary system. Their slurry properties, shell sintering processes, and high-temperature performance are systematically investigated. The results demonstrate that optimal slurry coating effectiveness is achieved when LA powder is processed with a liquid-to-powder ratio of 3:1 and a particle size of 300 mesh. While LA shells show no cracking at 1300 °C, their face coats fail above 1400 °C due to the formation of a La2Si2O7 phase. In contrast, LAS and LA11S shells suppress cracking through the La2Si2O7 and LaAl11O18 phases, respectively, exhibiting exceptionally high-temperature stability at 1400 °C and 1500 °C. All three shells meet the high-temperature strength requirements for CMSX-4 single-crystal alloy casting. Interfacial reaction analysis and Gibbs free energy calculations reveal that Al2O3-forming reactions occur between the novel shells and alloy melt, accompanied by minor dissolution erosion without other chemical side reactions. This work provides a high-performance face coat material solution for investment casting of nickel-based superalloys. Full article
(This article belongs to the Special Issue Advances in Ceramic Materials and Coatings)
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11 pages, 2022 KiB  
Article
Eu-Tb-Doped Y-BTC MOF: A Step Towards Optimization of an Energy Conversion System
by Francesca Lo Presti, Anna Lucia Pellegrino, Francesca Loschi, Emil Milan, Adolfo Speghini and Graziella Malandrino
Crystals 2025, 15(6), 572; https://doi.org/10.3390/cryst15060572 - 17 Jun 2025
Viewed by 407
Abstract
Lanthanide-based metal–organic frameworks (Ln-MOFs) represent a key material in various optical applications. Thus, they offer the possibility of fine-tuning their functional properties by adjusting the composition, stoichiometry, and ligand nature. This work reports for the first time the environmentally friendly one-pot synthesis of [...] Read more.
Lanthanide-based metal–organic frameworks (Ln-MOFs) represent a key material in various optical applications. Thus, they offer the possibility of fine-tuning their functional properties by adjusting the composition, stoichiometry, and ligand nature. This work reports for the first time the environmentally friendly one-pot synthesis of Eu-Tb-doped yttrium-1,3,5-benzenetricarboxylate MOF, i.e., Y-BTC: Eu (10%), Tb (10%), under mild conditions of temperature and pressure. Structural and morphological investigations were conducted through ATR-IR, XRD, and FE-SEM characterization. The doping percentage was analyzed by EDX spectroscopy. The luminescence properties confirm the down-shifting behavior of the MOF, paving the way for using this Eu-Tb-doped Y-BTC system in photovoltaic technology. Full article
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15 pages, 875 KiB  
Article
Multi-Configuration Dirac–Hartree–Fock Calculations of Pr9+ and Nd10+: Configuration Resolution and Probing Fine-Structure Constant Variation
by Songya Zhang, Cunqiang Wu, Chenzhong Dong and Xiaobin Ding
Atoms 2025, 13(6), 54; https://doi.org/10.3390/atoms13060054 - 16 Jun 2025
Viewed by 398
Abstract
We present high-precision multi-configuration Dirac–Hartree–Fock (MCDHF) calculations for the metastable states of Pr9+ and Nd10+ ions, systematically investigating their energy levels, transition properties, Landé gJ factors, and hyperfine interaction constants. Our results show excellent agreement with available experimental [...] Read more.
We present high-precision multi-configuration Dirac–Hartree–Fock (MCDHF) calculations for the metastable states of Pr9+ and Nd10+ ions, systematically investigating their energy levels, transition properties, Landé gJ factors, and hyperfine interaction constants. Our results show excellent agreement with available experimental data and theoretical benchmarks, while resolving critical configuration assignment discrepancies through detailed angular momentum coupling analysis. The calculations highlight the significant role of Breit interaction and provide the first theoretical predictions of electric quadrupole hyperfine constants (Bhfs). These findings deliver essential atomic data for the development of next-generation optical clocks and establish lanthanide highly charged ions as exceptional candidates for precision tests of fundamental physics. Full article
(This article belongs to the Special Issue Atomic and Molecular Data and Their Applications: ICAMDATA 2024)
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