Equilibrium relations and crystal structure of lithium fluorolanthanate phases

Thoma, R. E.; Brunton, G.; Penneman, R. A.; Keenan, Thomas K.

doi:10.1021/ic50087a019

Cited by 129 publications

(66 citation statements)

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“…In all the experiments in this work, the stoichiometry of neodymium oxide and the fluorinating agent was calculated based on theoretical values of reactions 1-4, assuming that if complete conversion of neodymium oxide occurs, then LiFNdF 3 forms the eutectic composition. The eutectic composition of LiF-NdF 3 system was experimentally determined to be 0.23 mol fraction of NdF 3 [19] and was calculated to be about 0.25 mol fraction of NdF 3 by van der Meer et al [22]. The LiF-NdF 3 phase diagram determined by the same researchers using the experimental data is shown in Fig.…”

Section: Microstructurementioning

confidence: 92%

“…The ratio of neodymium fluoride to fluorinating agent were prepared based on the stoichiometry of Eqs. [19] is formed in the system. The total amount of the mixture for all the systems was about 30 g. The mixtures were heated at 1223 K (950°C) for 3 h in a purified argon atmosphere.…”

Section: Methodsmentioning

confidence: 99%

“…Fig. 15 The optimized LiF-NdF 3 phase diagram: (filled square) experimental data liquidus; (filled triangle) experimental data solidus [19,22] …”

Section: Alloy Formationmentioning

confidence: 99%

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Electrochemical Extraction of Rare Earth Metals in Molten Fluorides: Conversion of Rare Earth Oxides into Rare Earth Fluorides Using Fluoride Additives

Abbasalizadeh

Malfliet

Seetharaman

et al. 2017

J. Sustain. Metall.

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In the present research on rare earth extraction from rare earth oxides (REOs), conversion of rare earth oxides into rare earth fluorides with fluoride fluxes is investigated in order to overcome the problem of low solubility of the rare earth oxides in molten fluoride salts as well as the formation of oxyfluorides in the fluorination process. Based on thermodynamic calculations, a series of experiments were performed for converting the rare earth oxides into rare earth fluorides using AlF 3 , ZnF 2 , FeF 3 , and Na 3 AlF 6 as fluorinating agents in a LiF-Nd 2 O 3 system. The formation of neodymium fluoride as a result of the reactions between these fluxes and neodymium oxide is confirmed. The rare earth fluoride thus formed can subsequently be processed through the electrolysis route in the same reactor, and rare earth metal can be produced as the cathodic deposit. In this concept, the REO dissolution in molten fluorides would become unnecessary due to the complete conversion of the oxide into the fluoride, REF 3 . The results of XRD and EPMA analysis of the reacted samples indicate that AlF 3 , ZnF 2 , and FeF 3 can act as strong fluorinating agents for the neodymium oxide giving rise to a complete conversion of neodymium oxide into neodymium fluoride.

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Section: Microstructurementioning

confidence: 92%

Section: Methodsmentioning

confidence: 99%

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Electrochemical Extraction of Rare Earth Metals in Molten Fluorides: Conversion of Rare Earth Oxides into Rare Earth Fluorides Using Fluoride Additives

Abbasalizadeh

Malfliet

Seetharaman

et al. 2017

J. Sustain. Metall.

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“…However, the coordinates of the invariant points was taken from the literature: NdF 3 -LiF system [9] and NdF 3 -NaF system [10].…”

Section: Calculation Of Phase Diagramsmentioning

confidence: 99%

Study of binary systems NdF3- MF (M = Li, Na, K): experimental, modeling and thermodynamic computation

Berkani

Gaune‐Escard

2013

MATEC Web of Conferences

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Abstract. The excess molar enthalpies HEm of the binary systems MF-NdF3 (M = Li, Na, K) were measured in the present work by high temperature calorimetry on a wide temperature (1220 K < T < 1400 K) and composition range. Some points of the equilibrium phase diagram have been also obtained by differential thermal analysis. Using the Hoch-Arpshofen model we represent the excess quantities of different systems. This will allow us thereafter to calculate the phase diagrams of binary systems NdF3-MF (M = Li, Na).

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“…LiErF4 and LiDyF4 (LEF and LDF, hereafter) crystals belong to the family of scheelite-type stucture with the space group classification 141/α (C64h), likewise as LiYF4 and LiYbF4 [9,10,11].…”

Section: Crystal Growth and Crystal Structurementioning

confidence: 99%

Spin-Lattice Relaxation and Superposition Model Calculation in Gd³⁺-Doped LiErF₄and LiDyF₄Crystals

Misiak

1993

Acta Phys. Pol. A

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The X-band EPR measurements were performed on Gd 3 +-doped LiErF4 and LiDyF4 single crystals at room temperature. The spin-lattice relaxation times were evaluated to be 2.7 x 10 -15 s, 1.0 x 10-15 s and 2.2 x 10' s for LiDyF4 , LiErF4 and LiYbF 4 , respectively. Spin-Hamiltonian parameters are determined and discussed in the light of the superposition model in order to determine the distortion of Gd3 + ion environment in LiREF4 host lattices (RE = Yb, Y, Er, Dy, and Gd).

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Equilibrium relations and crystal structure of lithium fluorolanthanate phases

Cited by 129 publications

References 1 publication

Electrochemical Extraction of Rare Earth Metals in Molten Fluorides: Conversion of Rare Earth Oxides into Rare Earth Fluorides Using Fluoride Additives

Electrochemical Extraction of Rare Earth Metals in Molten Fluorides: Conversion of Rare Earth Oxides into Rare Earth Fluorides Using Fluoride Additives

Study of binary systems NdF3- MF (M = Li, Na, K): experimental, modeling and thermodynamic computation

Spin-Lattice Relaxation and Superposition Model Calculation in Gd³⁺-Doped LiErF₄and LiDyF₄Crystals

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Equilibrium relations and crystal structure of lithium fluorolanthanate phases

Cited by 129 publications

References 1 publication

Electrochemical Extraction of Rare Earth Metals in Molten Fluorides: Conversion of Rare Earth Oxides into Rare Earth Fluorides Using Fluoride Additives

Electrochemical Extraction of Rare Earth Metals in Molten Fluorides: Conversion of Rare Earth Oxides into Rare Earth Fluorides Using Fluoride Additives

Study of binary systems NdF3- MF (M = Li, Na, K): experimental, modeling and thermodynamic computation

Spin-Lattice Relaxation and Superposition Model Calculation in Gd3+-Doped LiErF4and LiDyF4Crystals

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Spin-Lattice Relaxation and Superposition Model Calculation in Gd³⁺-Doped LiErF₄and LiDyF₄Crystals