Synthesis, crystal structures and luminescence properties of rare earth-cadmium hydroxycarbonats with the formula RE 2 Cd(CO 3 )(OH) 6 (RE = Y, Er)

Song, Jun‐Ling; Cui, Jian-Qiu; Wu, Chao; Yang, Gang; Zhang, Chi

doi:10.1016/j.ica.2016.02.016

Cited by 4 publications

(2 citation statements)

References 32 publications

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“…It means it might be potentially applied in the UV region. 29 The UV− vis-NIR spectra are clearly different when the rare-earth element changes in Na 3 RE(CO 3 ) 3 •6H 2 O. From Sm to Dy, the sample is nearly white in color with no significant absorption in the visible region.…”

Section: Resultsmentioning

confidence: 98%

Soaking the Rare-Earth Carbonates for a Change: An Alternative Approach to Explore Carbonate Nonlinear Optical Crystals

Wang,

Lu,

Liu

et al. 2024

Inorg. Chem.

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Alkali-metal rare-earth carbonates (ARECs) find great potential in nonlinear optical applications. As the most common method, the hydrothermal reaction is widely used in synthesizing ARECs. The black-box nature of the hydrothermal reaction makes it difficult for understanding the formation processes and therefore may slow down the pace of structural discovery. Here, by simply soaking the rare-earth carbonates in Na 2 CO 3 solutions, we successfully obtain a series of noncentrosymmetric Na 3 RE(CO 3 ) 3 •6H 2 O (RE = Tb 1, Sm 2, Eu 3, Gd 4, Dy 5, Ho 6, and Er 7) compounds without using the hightemperature hydrothermal method. The transformation process, investigated by powder X-ray diffraction and scanning electron microscopy, is governed by the concentration of the soaking solutions. Na 3 Tb(CO 3 ) 3 •6H 2 O, as an example, is studied structurally, and its physical properties are characterized. It exhibits a second harmonic generation effect of 0.5 × KDP and a short UV cutoff edge of 222 nm (5.8 eV). Our study provides insights for exploring new AREC structures, which may further advance the development of carbonate nonlinear optical crystals.

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Section: Resultsmentioning

confidence: 98%

Soaking the Rare-Earth Carbonates for a Change: An Alternative Approach to Explore Carbonate Nonlinear Optical Crystals

Wang,

Lu,

Liu

et al. 2024

Inorg. Chem.

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“…China's rare earth element ( REE ) reserves that are of industrial grade are mainly classified into three categories: mixed bastnäsite and monazite (accounting for 83.7% of China's total REE reserves, located in Bayan Obo, Inner Mongolia), bastnäsite (10.6%, in Sichuan and Shandong provinces) and REE ions adsorbed on clays (2.9%, in seven provinces of southern China) (Dołęgowska & Migaszewski, 2013; Yang et al ., 2013; Weng et al ., 2016). The demand for REE s and their compounds in the high-tech industry and the ongoing development of advanced technologies has increased considerably over recent years (Morais & Ciminelli, 2004; Binnemans et al ., 2013; Liu et al ., 2016; Schaeffer et al ., 2016; Song et al ., 2016). Medium and heavy REE s ( MREE s and HREE s) find more applications and are of greater value than light REE s. Bayan Obo REE deposits are rich in light REE s (accounting for 97% of the total rare earths of the deposit), whereas the deposits of REE ions adsorbed on clays are rich in MREE s and HREE s (accounting for >80% of world's total MREE s and HREE s) (Kanazawa & Kamitani, 2006; Chi & Tian, 2008; Castor, 2008).…”

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confidence: 99%

Leaching behaviour of rare earth elements from low-grade weathered crust elution-deposited rare earth ore using magnesium sulfate

et al. 2018

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The present study investigates the use of magnesium sulfate (MgSO4) instead of (NH4)2SO4 as a lixiviant in the recovery of rare earth elements (REEs) from clays. Experiments were carried out to investigate the influence of leaching conditions such as leaching time, lixiviant concentration and liquid:solid ratio on the leaching efficiency. The optimum leaching conditions, leading to 75.48% of total REE leaching efficiency, required a stirring speed of 500 rpm, a leaching time of 30 min, a lixiviant concentration of 3 wt.% and a liquid:solid ratio of 3:1. After extension of the leaching process by a second stage, the leaching efficiency may reach up to 96.19%, which is slightly higher than that obtained by (NH4)2SO4. Leaching varies from element to element, with Ce presenting the lowest leaching efficiency, and the partition in leaching solution is in agreement with that in raw ore other than for Ce. Based on these findings, MgSO4 lixiviant is an excellent alternative leaching agent for a sustainable REE industry because it reduces or eliminates NH4+–N pollution.

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Heterometallic Zn₃Ln₃ Ensembles Containing (μ₆‐CO₃) Ligand and Triangular Disposition of Ln³⁺ ions: Analysis of Single‐Molecule Toroic (SMT) and Single‐Molecule Magnet (SMM) Behavior

Goura

Colacio

Herrera

et al. 2017

Chemistry A European J

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Two new heterometallic Zn Ln (Ln =Dy, Tb) complexes, with a double triangular topology of the metal ions, have been assembled from the polytopic Mannich base ligand 6,6'-{[2-(dimethylamino)ethylazanediyl]bis(methylene)}bis(2-methoxy-4-methylphenol) (H L) with the aid of an in situ generated carbonate ligand from atmospheric CO fixation. Theoretical calculations indicate axial ground states for the Ln ions in these complexes, with their local magnetic moments being almost coplanar and tangential to the Ln atoms that define the equilateral triangle. Therefore, they can be considered as single-molecule toroics (SMTs) with almost zero total magnetic moment. Micro-SQUID measurements on the Dy counterpart show hysteresis loops below 3 K that have an S-shape, with large coercive fields opening upon cooling. This behavior is typical of a single molecule magnet (SMM) with very slow zero-field relaxation. At around ±0.35 T, the loops have a broad step, which is due to a direct relaxation process and corresponds to an acceleration of the relaxation of the magnetization, also observed at this magnetic field from ac susceptibility measurements. Simulations suggest that the broad step corresponds to two level avoidance of crossing points where the spin chiral Kramers doublet meets excited states of the coupled manifold, whose position is defined by exchange and dipole interactions. The Tb counterpart does not exhibit SMM behavior, which is due to the fact that the degeneracy of the ground state of the exchange coupled system is lifted at zero field, thus favoring quantum tunneling of magnetization (QTM).

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Synthesis, crystal structures and luminescence properties of rare earth-cadmium hydroxycarbonats with the formula RE 2 Cd(CO 3 )(OH) 6 (RE = Y, Er)

Cited by 4 publications

References 32 publications

Soaking the Rare-Earth Carbonates for a Change: An Alternative Approach to Explore Carbonate Nonlinear Optical Crystals

Soaking the Rare-Earth Carbonates for a Change: An Alternative Approach to Explore Carbonate Nonlinear Optical Crystals

Leaching behaviour of rare earth elements from low-grade weathered crust elution-deposited rare earth ore using magnesium sulfate

Heterometallic Zn₃Ln₃ Ensembles Containing (μ₆‐CO₃) Ligand and Triangular Disposition of Ln³⁺ ions: Analysis of Single‐Molecule Toroic (SMT) and Single‐Molecule Magnet (SMM) Behavior

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Synthesis, crystal structures and luminescence properties of rare earth-cadmium hydroxycarbonats with the formula RE 2 Cd(CO 3 )(OH) 6 (RE = Y, Er)

Cited by 4 publications

References 32 publications

Soaking the Rare-Earth Carbonates for a Change: An Alternative Approach to Explore Carbonate Nonlinear Optical Crystals

Soaking the Rare-Earth Carbonates for a Change: An Alternative Approach to Explore Carbonate Nonlinear Optical Crystals

Leaching behaviour of rare earth elements from low-grade weathered crust elution-deposited rare earth ore using magnesium sulfate

Heterometallic Zn3Ln3 Ensembles Containing (μ6‐CO3) Ligand and Triangular Disposition of Ln3+ ions: Analysis of Single‐Molecule Toroic (SMT) and Single‐Molecule Magnet (SMM) Behavior

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Heterometallic Zn₃Ln₃ Ensembles Containing (μ₆‐CO₃) Ligand and Triangular Disposition of Ln³⁺ ions: Analysis of Single‐Molecule Toroic (SMT) and Single‐Molecule Magnet (SMM) Behavior