来源：ACS PublicationsA novel orthorhombic polymorph of (NH4,Li)Eu(MoO4)2 enabled by partial substitution of NH4 with Li was synthesized via a one-pot low-temperature hydrothermal route using a Li/NH4 precursor solution. Synchrotron X-ray powder diffraction and Rietveld refinement confirmed that this phase crystallizes in an orthorhombic lattice, representing a new structure type distinct from the known triclinic and tetragonal phases (P1 and I41/a space groups). Under UV excitation, the orthorhombic ((NH4)1–xLix)Eu(MoO4)2 (x = 0.074–0.172) with Pbcn space group exhibits intense red photoluminesc...
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2025
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A Mixed-Anion Design Approach for High-Efficiency X-ray Scintillators A Study of KLn(SO4)F2 (Ln = Eu, Gd, Tb, Dy, Ho, and Tm) 来源：ACS PublicationsHigh-quality single crystals of mixed anion rare earth sulfate fluorides KLn(SO4)F2 (Ln = Eu, Gd, Tb, Dy, Ho, and Tm), monoclinic space group P21/m, were obtained using an HF-free mild hydrothermal synthesis. Thermal, magnetic, and optical properties of these materials were investigated after determining their crystal structures and their chemical compositions using a combination of single-crystal and powder X-ray diffraction. Notably, the photol...
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2025
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Vacuum-Induced Reversible Phase Transformation of Rare-Earth Difluoroacetates Insights into Structural Evolution, Kinetics, and Luminescence Response 来源：ACS PublicationsRare-earth difluoroacetate Eu1–xTbx(dfa)3(H2O)2·H2O (dfa = CF2HCOO) exhibits a pressure-dependent crystalline-to-semicrystalline phase transformation similar to that reported for the trifluoroacetate series. This transformation occurs when pressure is decreased below 100 mTorr and is driven by removal of crystallization water and aquo ligands; both types of water molecules participate in hydrogen-bond networks sustain...
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2025
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来源：ACS PublicationsMalonate ligands demonstrate versatility for intercalating metal complexes into layered rare-earth hydroxides (LREHs), enabling controlled tuning of coordination geometry and composition. As a proof of concept, a series of copper(II) malonate complexes with various substituents was synthesized and successfully intercalated into layered yttrium, europium, or terbium hydroxide at room temperature via anion-exchange reactions. The copper content in these hybrid materials increased in the order: butylmalonate X-ray spectroscopy (EDX), IR, UV–vis, and electron paramagnetic r...
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2025
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