Infrared spectra of rutherfordine and sharpite

Urbanec, Z.; Čejka, Jiří

doi:10.1135/cccc19790001

Cited by 16 publications

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“…[17,18] They suggested that solid-solutions with limited solubility may exist in the system UO 2 CO 3 -UO 2 (OH) 2 .xH 2 O, thus forming UO 2 (CO 3 ) 1−x (OH) 2x .yH 2 O. This assumption was later discussed and accepted by Finch et al [5] and Catalano and Brown.…”

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“…This supports the conclusions reached byČejka and Urbanec. [8,17,21] Composition of a set of synthetic UO 2 (CO 3 ) 1−x (OH) 2x .yH 2 O (x, y ≥ 0) prepared under different conditions proves that practically no adsorbed water is present in such phases and some solid solutions with limited solubility of UO 2 (OH) 2 .xH 2 O in UO 2 CO 3 may exist.Čejka and Urbanec inferred on the basis of interpretation of infrared spectra and thermal analysis a more orderly layered (polymeric) structure of hydrothermally synthesized uranyl monocarbonate phases [ν 3 (UO 2 ) 2+ 970 ⇒ 986 cm −1 ] and a 'disordered' layered structure of uranyl monocarbonate phases prepared at laboratory temperature [ν 3 (UO 2 ) 2+ approximately 956-965 cm −1 ]. Natural uranyl carbonate rutherfordine [ν 3 (UO 2 ) 2+ ∼ 985 cm −1 ] corresponds to those of synthetic uranyl carbonate prepared under hydrothermal conditions.…”

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“…Natural uranyl carbonate rutherfordine [ν 3 (UO 2 ) 2+ ∼ 985 cm −1 ] corresponds to those of synthetic uranyl carbonate prepared under hydrothermal conditions. [8,17,21] Theoretical study of bonding in UO 2 CO 3 and its hydrated complexes was recently published. [22,23] New data on enthalpy of formation of rutherfordine, UO 2 CO 3 , was recently given by Kubatko et al [24] In this work we attribute bands at various wavenumbers to vibrational modes of rutherfordine using Raman spectroscopy complemented with near-infrared (NIR) and infrared spectroscopy.…”

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A Raman spectroscopic study of the uranyl mineral rutherfordine—revisited

Frost

Čejka

2009

J Raman Spectroscopy

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The molecular structure of the uranyl mineral rutherfordine has been investigated by the measurement of the near-infrared (NIR) and Raman spectra and complemented with infrared spectra including their interpretation. The spectra of rutherfordine show the presence of both water and hydroxyl units in the structure as evidenced by IR bands at 3562 and 3465 cm −1 (OH) and 3343, 3185 and 2980 cm −1 (H 2 O). Raman spectra show the presence of four sharp bands at 3511, 3460, 3329 and 3151 cm −1 . Corresponding molecular water bending vibrations were only observed in both Raman and infrared spectra of one of two studied rutherfordine samples. The second rutherfordine sample studied contained only hydroxyl ions in the equatorial uranyl plane and did not contain any molecular water. The infrared spectra of the (CO 3 ) 2− units in the antisymmetric stretching region show complexity with three sets of carbonate bands observed. This combined with the observation of multiple bands in the (CO 3 ) 2− bending region in both the Raman and IR spectra suggests that both monodentate and bidentate (CO 3 ) 2− units may be present in the structure. This cannot be exactly proved and inferred from the spectra; however, it is in accordance with the X-ray crystallographic studies. Complexity is also observed in the IR spectra of (UO 2 ) 2+ antisymmetric stretching region and is attributed to non-identical UO bonds. U-O bond lengths were calculated using wavenumbers of the ν 3 and ν 1 (UO 2 ) 2+ and compared with data from X-ray single crystal structure analysis of rutherfordine. Existence of solid solution having a general formula (UO 2 )(CO 3 ) 1−x (OH) 2x .yH 2 O (x, y ≥0) is supported in the crystal structure of rutherfordine samples studied. Copyright

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A Raman spectroscopic study of the uranyl mineral rutherfordine—revisited

Frost

Čejka

2009

J Raman Spectroscopy

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“…Included in these are many uranyl carbonates. [4][5][6] These uranyl carbonates may be divided into those based upon tricarbonates and those with single carbonate in the formula such as rutherfordine UO 2 CO 3 7-9 and blatonite UO 2 CO 3 .H 2 O. 10 Sharpite is a basic uranyl carbonate Ca(UO 2 ) 6 (CO 3 ) 5 (OH) 4 .6H 2 O.…”

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confidence: 99%