Spectroscopic investigation of the influence of uranium ions on the structure of borate glasses

Culea, E.; Milea, I.; Iliescu, T.

doi:10.1016/0022-3093(94)90320-4

Cited by 7 publications

(5 citation statements)

References 10 publications

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“…Our optical data, in agreement with previous data [2][3][4], prove that the redox chemistry of uranium ions in the studied glasses can be described by the U>!U>!U> equilibrium. The amount of uranium ions in reduced valence states ( #4, and #5) is higher in glasses containing B O than in those containing Na B O .…”

Section: Discussionsupporting

confidence: 92%

“…1. According to prior assignments [2][3][4] the optical absorption features shown in this figure (marked with arrows) are due to uranium ions in their #4, #5 and #6 valence states. Thus, the absorption bands at &15,600 cm\ and &23,240 cm\ are due to U> ions in eightfold coordination, the shoulder at &20,400 cm\ and the band at &24,090 cm\ are due to U> ions appearing as UO> species, while the absorption band at 13,700 cm\ is assigned to U> ions in sixfold coordination [2][3][4].…”

Section: Resultsmentioning

confidence: 97%

“…Spectroscopic data obtained for some borate and borosilicate glasses containing U O or UO revealed the presence of uranium ions in different valence stages (#6, #5 and #4) and permitted the study of their redox equilibrium [2][3][4]. To extend the available information on glasses containing uranium ions we investigated some optical properties of different borate glasses containing UF , UO and UO .…”

Section: Introductionmentioning

confidence: 98%

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An optical spectroscopic study of borate glasses containing uranium ions

Culea

Milea

Rusu

et al. 1996

Analytical and Bioanalytical Chemistry

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Section: Discussionsupporting

confidence: 92%

Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 98%

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An optical spectroscopic study of borate glasses containing uranium ions

Culea

Milea

Rusu

et al. 1996

Analytical and Bioanalytical Chemistry

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“…The band in the region of 488-496 cm −1 was assigned as due to loose BO 4 units (Kamitsos et al 1983); that in the region of 768-808 cm −1 is due to boroxol groups (Konijnendijk 1975). The band in the region of 720 cm −1 can be assigned to chain type metaborate groups (Culea et al 1994).…”

Section: Raman Spectramentioning

confidence: 99%

Spectroscopic investigations on Cu(II) ions doped in alkali lead borotellurite glasses

Murali¹,

Rao²

1999

J. Phys.: Condens. Matter

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Electron paramagnetic resonance, optical absorption spectra, Raman spectra and physical properties of copper(II) ions in (85 − x/2)R 2 B 4 O 7 -xPbO-yCuO-(15 − x/2 − y)TeO 2 (x = 0,10; y = 0.1-1.5; R = Li, Na or K) glasses were studied. EPR spectra of all the glasses show resonance peaks characteristic of Cu 2+ ions. The number of spins participating in the resonance was measured as a function of temperature and the activation energy was calculated. From the EPR and density measurements, the ratio of number of copper ions in +2 state to the total copper ions (i.e., N 2 /N T ) was calculated. The paramagnetic susceptibility was calculated from the EPR data at various temperatures and the Curie constant was calculated from the 1/χ -T graph. The optical absorption spectra of all the samples show a broad absorption band; the position of the band maxima varies from 14 500 to 12 700 cm −1 for glasses with different alkali ions. The optical energy gap E opt and Urbach energy E were calculated for all the glass samples from their ultraviolet edges. The optical energy gap varies between 3.4 and 2.7 eV and increases from Li to K glasses. Also, it was observed that as copper ion concentration is increased, E opt decreases while E increases. This was explained as due to change in non-bridging oxygen content. Raman spectra of three samples were recorded at room temperature. The bands were assigned as due to various groups of boron.

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“…Tetraboric acid is known to be a weak acid; therefore, it can form strong complexes with metals, including uranium. More than 20 uranyl borate solids have been reported in the literature and studied for their structural properties [33][34][35][36]. Some of them can form via the slow evaporation of aqueous solutions containing uranyl and borate in excess at room temperature [37].…”

Section: Tetraborate Complexationmentioning

confidence: 99%

Uranium(VI) solubility in carbonate-free WIPP brine

Lucchini¹,

Borkowski²,

Richmann³

et al. 2013

Radiochimica Acta

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The solubility of uranium(VI) was determined in WIPP-relevant brines as a function of pCH+ and ionic strength, in the absence of carbonate. Carbonate concentration was below 2 × 105 M, measured using the gas chromatography method. In the absence of carbonate, the uranium(VI) solubilities were about × 106 M in GWB at pCH+ ≥7 and about × 108– × 107 M in ERDA-6 brine at pCH+ ≥8. Solubility of uranium(VI) was also measured in NaCl media at the same levels as in ERDA-6 brine. The data established a uranium solubility that was 10–100 times lower than published results from Diaz-Arocas and Grambow [13], and they are in good agreement with modeling results and other literature data [11,12]. In the absence of carbonate, hydrolysis was the main complexation and precipitation mechanisms for uranium(VI) solubility at high ionic strength and pC H+ ≥7. However, the effect of borate complexation was noticeable at pCH+ ∼8–9.

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Spectroscopic investigation of the influence of uranium ions on the structure of borate glasses

Cited by 7 publications

References 10 publications

An optical spectroscopic study of borate glasses containing uranium ions

An optical spectroscopic study of borate glasses containing uranium ions

Spectroscopic investigations on Cu(II) ions doped in alkali lead borotellurite glasses

Uranium(VI) solubility in carbonate-free WIPP brine

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