Review of Electronic Absorption Spectra of Molten Salts

Smith, G. Pedro

doi:10.2172/4667314

Cited by 3 publications

(3 citation statements)

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“…This is due to the overlap of transitions arising from both tetrahedral and octahedral Ni species, [NiCl 4 ] 2− and [NiCl 6 ] 4− , respectively. 44 The two peaks at 628 and 692 nm correspond to the 3 T 1g (F) → 3 T 1g (P) transition of the tetrachloronickelate species. Cr 3+ has two peaks, arising from the 4 A 2g (F) → 3 T 1g (P) and 3 A 2g (F) → 3 T 1g (F) transitions (549.5 nm and 815 nm, respectively) of the [CrCl 6 ] 3complex ion.…”

Section: Resultsmentioning

confidence: 99%

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Spectroelectrochemical Behavior of Cr, Fe, Co, and Ni in LiCl-KCl Molten Salt for Decontaminating Radioactive Metallic Wastes

Yoon

Choi

2021

J. Electrochem. Soc.

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This study examines the thermodynamic, kinetic, and spectroscopic behaviors of Cr, Fe, Co, and Ni to lay the foundation to develop an electrochemical decontamination process for radioactive metallic wastes. Cyclic voltammetry combined with numerical fitting was used to obtain the formal potentials, standard rate constants, and diffusion coefficients of redox reactions, Cr(II)/Cr, Fe(II)/Fe(0), Co(II)/Co(0), and Ni(II)/Ni(0), in LiCl-KCl at 773 K. The order of the diffusion coefficients was 10–5 cm2 s−1, which agrees with the existing data and the standard rate constants showed similar values with the order of 10–3 cm s−1 between experimental correlations and numerical fitting. UV–vis-NIR absorption spectroscopy of the metallic constituents was performed to derive molar absorption coefficients and molecular structures in molten salt media. In particular, the redox reaction of Cr(III)/Cr(II) was investigated by chronoabsorptometry to obtain its formal potential, the number of electrons, and the diffusion coefficient of Cr(II). The obtained reaction properties were used in the numerical modeling of the ECE reaction in a Ni and Co binary system to reproduce the experimental results of CV, revealing the presence of chemical reaction. The findings of this study will be directly used for designing a decontamination process to produce acceptable waste forms and reduce waste volume.

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Section: Resultsmentioning

confidence: 99%

“…In the case of Cr(II), it is known that it has a peak at slightly over 1000 nm, which is beyond the measured regions. 44 A peak of Cr(III) at 549.5 nm was adopted for comparing the reactions between Cr(III) and Cr(II) since the peak at 815 nm is likely to be overlapped with Cr(II) peaks. Table III.…”

Section: Spectroelectrochemicalmentioning

confidence: 99%

Spectroelectrochemical Behavior of Cr, Fe, Co, and Ni in LiCl-KCl Molten Salt for Decontaminating Radioactive Metallic Wastes

Yoon

Choi

2021

J. Electrochem. Soc.

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“…For that reason, a few experimental works have been performed by using spectroscopic techniques in the molten halide salts. The absorption spectroscopic properties of most lanthanides in various molten halide salts have been analyzed to investigate the structural symmetry of chemical constitution and redox behaviors and to determine their molar absorptivities for the purpose of quantification [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. However, the absorption spectra and the molar absorptivities in those literature works have not been completely reported for all lanthanide series.…”

Section: Introductionmentioning

confidence: 99%