XAFS analyses of molten metal fluorides

Matsuura, Haruaki; Watanabe, Sou; Akatsuka, Hiroshi; Okamoto, Yoshihiro; Adya, Ashok K.

doi:10.1016/j.jfluchem.2008.07.012

Cited by 18 publications

(14 citation statements)

References 42 publications

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“…19 An important factor in A c c e p t e d M a n u s c r i p t 3 these developments is the availability of high purity materials inert toward molten fluorides (boron nitride, pyrolitic boron nitride and glassy carbon) for the design of new sample containers. Nuclear magnetic resonance (NMR) spectroscopy, 20,21 extended X-ray fine absorption spectroscopy, 22,23 Raman spectroscopy, 24 electrochemistry, 25,26 thermodynamics studies, 27,28,29 etc. have thus beneficiated a new impulse.…”

Section: Introductionmentioning

confidence: 99%

Evidence of dynamical local scale distribution heterogeneities in CsF-AF (A=Li, Na, K and Rb) molten salts

Rollet

Bessada

2015

Journal of Fluorine Chemistry

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International audienceThe local structure of molten CsF-AF (A = Li, Na, K and Rb) has been studied by high temperature Nuclear Magnetic Resonance (NMR) spectroscopy. The 19F and 133Cs chemical shifts have been measured as a function of the molar fraction of CsF. 19F chemical shift varies linearly with composition while 133Cs chemical shift presents a break around the eutectics composition. Furthermore, in molten CsF-LiF at high CsF concentration, 133Cs chemical shift is nearly constant. The evolutions of 19F and 133Cs chemical shifts versus CsF-AF composition have been interpreted as a signature of dynamical local scale distribution heterogeneities

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Section: Introductionmentioning

confidence: 99%

Evidence of dynamical local scale distribution heterogeneities in CsF-AF (A=Li, Na, K and Rb) molten salts

Rollet

Bessada

2015

Journal of Fluorine Chemistry

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“…Therefore, they concluded that an octahedral geometry was slightly distorted for light rare earth chlorides. Bessada et al reported the speciation of lanthanide and actinide in molten fluorides by NMR and EXAFS (60) Matsurra et al also reported the XAFS analysis results of molten salt fluorides such as PbF 2 , LiF-PbF 2 , SrF 2 , and BaF 2 (61). They concluded that in molten divalent fluorides, the tetrahedral coordination of fluorides around the cation was predominant.…”

Section: Other Spectroscopic Studies Of Lanthanidesmentioning

confidence: 99%

“…The report concluded that all lanthanide chloride melts show qualitative similarities in vibrational relaxation and frequency modulation times in a molten state. Recently, studies on X-ray absorption fine structure studies (XAFS) and extended Xray absorption fine structure (EXAFS) for lanthanides in molten salt media have been reported (57)(58)(59)(60)(61)(62). These spectroscopic methods provided structural information.…”

Section: Other Spectroscopic Studies Of Lanthanidesmentioning

confidence: 99%

Spectroscopic Studies of Lanthanides Ion in High-Temperature Molten Salt

Song

Yeon

2015

Applied Spectroscopy Reviews

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Spectroscopic studies for lanthanide elements in molten salt media performed using absorption, fluorescence, infrared, Raman, electron spin resonance spectroscopy (EPR), and M€ ossbaur spectroscopy were reviewed in an effort to understand the effect of structural change and chemical behavior of lanthanides on the temperature increase and the matrix change. The absorption spectroscopic studies revealed electronic energy levels of the transitions with the general structural information of the lanthanide elements, whereas the laser-induced fluorescence studies revealed more detailed information on lanthanide elements such as the lifetime behavior, structural changes, and hypersensitive transition. Infrared and Raman spectroscopy also provided structural details of molecule containing lanthanides, and the EPR and M€ ossbaur spectroscopy provided supporting information for the spontaneous reduction of trivalent lanthanides, such as Eu(III). The recent development of X-ray spectroscopy such as extended X-ray absorption fine structure (EXAFS) also provided detailed information for lanthanide halide in a molten salt medium. The characteristics of f-d as well as f-f transitions of the lanthanide elements were reviewed and the structural changes depending on the media, lanthanides element, and temperature were discussed in detail.

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“…[1][2][3] In molten fluorides, such information has been experimentally brought by Raman, 4-6 NMR 7-10 and EXAFS [11][12][13][14] spectroscopies. [1][2][3] In molten fluorides, such information has been experimentally brought by Raman, 4-6 NMR 7-10 and EXAFS [11][12][13][14] spectroscopies.…”

Section: Introductionmentioning

confidence: 99%

An in situ spectroscopic study of the local structure of oxyfluoride melts: NMR insights into the speciation in molten LiF–LaF₃–Li₂O systems

2015

Self Cite

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The local structure of molten LaF3-LiF-Li2O has been investigated by high temperature NMR spectroscopy. The (139)La and (19)F chemical shifts have been measured as a function of temperature and composition. The NMR spectra show that Li2O reacts completely with LaF3 to form a LaOF compound in the solid state below the melting temperature of the sample. LaOF is not completely dissolved in the fluoride melt and solid LaOF is observed in the (19)F spectra for Li2O concentrations above 10 mol%. We discuss the local environment of lanthanum ions in molten LaF3-LiF-Li2O and compare the results to those with the LaF3-LiF-CaO system. The analysis of the temperature and Li2O concentration dependences of the (139)La and (19)F chemical shifts suggests that several kinds of lanthanum oxyfluoride long-lived LaOxFy(3-x-y) units are present in the melt.

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XAFS analyses of molten metal fluorides

Cited by 18 publications

References 42 publications

Evidence of dynamical local scale distribution heterogeneities in CsF-AF (A=Li, Na, K and Rb) molten salts

Evidence of dynamical local scale distribution heterogeneities in CsF-AF (A=Li, Na, K and Rb) molten salts

Spectroscopic Studies of Lanthanides Ion in High-Temperature Molten Salt

An in situ spectroscopic study of the local structure of oxyfluoride melts: NMR insights into the speciation in molten LiF–LaF₃–Li₂O systems

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XAFS analyses of molten metal fluorides

Cited by 18 publications

References 42 publications

Evidence of dynamical local scale distribution heterogeneities in CsF-AF (A=Li, Na, K and Rb) molten salts

Evidence of dynamical local scale distribution heterogeneities in CsF-AF (A=Li, Na, K and Rb) molten salts

Spectroscopic Studies of Lanthanides Ion in High-Temperature Molten Salt

An in situ spectroscopic study of the local structure of oxyfluoride melts: NMR insights into the speciation in molten LiF–LaF3–Li2O systems

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Product

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About

An in situ spectroscopic study of the local structure of oxyfluoride melts: NMR insights into the speciation in molten LiF–LaF₃–Li₂O systems