来源：ACS PublicationsNanocrystalline CeO2 is a chemically tunable wide-bandgap host lattice of interest for quantum information technologies due to its ability to accommodate optically- and spin-active defects. Here, we investigate CeO2 nanocrystals as hosts for near-infrared-compatible Yb3+ ions as optically active spin quantum bits (qubits). We characterize the as-synthesized Yb3+-doped CeO2 nanocrystals (0.01–10% Yb) by photoluminescence, which reveals short photoluminescence lifetimes dominated by nonradiative decay arising from surface and Ce3+-related defects. Thermal annealing at 700 ...
Release time:
2026
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来源：ACS PublicationsSkyrocketing demand for rare-earth elements makes their isolation and reuse from electronic waste an increasingly attractive alternative to mining. Typically, the capture of individual lanthanides from mixtures requires the iterative design of complex, macrocyclic ligands, a sometimes successful but often laborious process. Here we show that the self-assembly of rare-earth ions with a ditopic ligand, Ld, results in the selective incorporation of smaller lanthanides and gives rise to impressive separation factors. Comparison to a monotopic ligand, Lm, shows that the separatio...
Release time:
2026
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来源：ACS PublicationsRare-earth (RE) doping shows extensive potential in boosting thermoelectric performance of GeTe-based materials, which are promising candidates for midtemperature thermoelectric applications. However, the low solubility of RE elements in GeTe limits their effectiveness in improving the thermoelectric dimensionless figure of merit (ZT). Here, we reveal that the influence of Ce doping in GeTe extends beyond atomic substitution. At low Ce concentrations, a minor amount of Ce can successfully substitute Ge in the GeTe matrix, forming CeGe point defects, tuning the carrier concen...
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2026
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来源：ACS PublicationsIn situ leaching of ion-adsorption rare earth deposits (IAREDs) in southern China creates evolving, multi-contaminant legacies that differ markedly across the mining lifecycle. This study examines the spatiotemporal hydrogeochemical patterns in a representative watershed, spanning active mining areas, abandoned areas undergoing natural recovery, and downstream residential areas receiving lime-treated effluent. In active mining areas, the injection of MgSO4 lixiviant rapidly mobilizes rare earth elements (REEs) and potentially toxic elements (PTEs, e.g., Cd and Pb) mainly thr...
Release time:
2026
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