Microstructure and fast ionic conduction of inorganic fluoride and oxide eutectic composites prepared from the melt

Trnovcová, V.; Starostin, M.; Čička, Roman; Федоров, П. П.; Bárta, Č.; Labaš, Vladimír; Соболев, Б. П.

doi:10.1016/s0167-2738(00)00381-7

Cited by 11 publications

(6 citation statements)

References 3 publications

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“…In the past, some growth studies of the eutectic system LiF−LiYF 4 have been done using Bridgman and horizontal directional solidification methods 12,22,23 up to 20 mm/h solidification rate. The micro-pulling down method has been also recently employed to grow and compare LiF−LiYF 4 and LiF−LiGdF 4 eutectics at pulling rates up to 300 mm/h 24 showing a cross-over pulling rate from coupled to cellular microstructure.…”

Section: Introductionmentioning

confidence: 99%

Directional solidification of the eutectic LiF–LiYF4 using Bridgman and micro-pulling down techniques: Microstructural study and some properties

Acosta

Ganschow²,

Klimm³

et al. 2014

Journal of the European Ceramic Society

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The eutectic LiF−LiYF 4 has been solidified by Bridgman and micro-pulling down (mPD) at pulling rates from 4 to 300 mm/h. The microstructure changes from a coupled, interpenetrated-like one to macrofaceted colonies composed of an approximately triangular arrangement of LiF fibers inside the LiYF 4 matrix as the pulling rate increases. The cross-over pulling rate is around 3 times larger for the mPD method, corresponding to its larger solidification gradient. The crystallographic growth direction of the matrix phase was found using EBSD. Effective medium estimations of the THz permittivity of the composite predict around the interphase phonon-polariton resonance (wavelength around 17.5 µm) a small permittivity hyperbolic behavior specific of the ordered composite that is tolerant to different relative orientations. Water etching of polished crosssections constitutes a very simple procedure to generate surface micro-holes of predefined size in the LiYF 4 matrix.

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Section: Introductionmentioning

confidence: 99%

Directional solidification of the eutectic LiF–LiYF4 using Bridgman and micro-pulling down techniques: Microstructural study and some properties

Acosta

Ganschow²,

Klimm³

et al. 2014

Journal of the European Ceramic Society

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“…5 indicates that the microstructure corresponds to a non-eutectic phase. With the increasing growth velocity, the dimensions of the two phases are expected to decrease [23,24].…”

Section: Microstructurementioning

confidence: 99%

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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“…This character as in the present work probably arises from a phase mismatch. The material AZ40, or probably another composition closer to the eutectic one [30], seems to have a promising future for applications in fusion reactors.…”

Section: Studied Materials and Their Applicabilitymentioning

confidence: 99%

Influence of chemical composition on dielectric properties of Al2O3 and ZrO2 plasma deposits

Ctibor

Sedláček

Neufuss

2003

Ceramics International

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Aluminum oxide, zirconium oxide and their mixture were plasma sprayed by a water-stabilized plasma gun. Resulting deposits were studied as dielectrics. Capacity and loss factor were measured for the frequency range 200-10 6 Hz and relative permittivity was calculated. Electric resistance was also measured and volume resistivity calculated for all studied materials. It was proved that dielectric behavior of plasma sprayed oxide ceramics like alumina-and zirconia-based materials at low voltage follows the expectations based on the knowledge of dielectric behavior of sintered ceramics. #

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Microstructure and fast ionic conduction of inorganic fluoride and oxide eutectic composites prepared from the melt

Cited by 11 publications

References 3 publications

Directional solidification of the eutectic LiF–LiYF4 using Bridgman and micro-pulling down techniques: Microstructural study and some properties

Directional solidification of the eutectic LiF–LiYF4 using Bridgman and micro-pulling down techniques: Microstructural study and some properties

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

Influence of chemical composition on dielectric properties of Al2O3 and ZrO2 plasma deposits

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