Determination de la structure cristalline de la variete a des hydroxycarbonates de terres rares LnOHCO3 (Ln = Na)

De×pert, H.; Caro, P.

doi:10.1016/0025-5408(74)90106-8

Cited by 52 publications

(34 citation statements)

References 10 publications

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“…end of part 1 and the end of part 2, x-ray powder diffraction patterns _ were obtained from the solids. The three patterns were nearly identical to each other and to that reported for NdOHC03 [11]. From the molar concentrations of Am3+, HCO) and a+, a solubility product quotient was calculated.…”

Section: Amohc03supporting

confidence: 80%

Behavior of americium in aqueous carbonate systems

Silva¹

1983

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Section: Amohc03supporting

confidence: 80%

Behavior of americium in aqueous carbonate systems

Silva¹

1983

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“…3, the FT-IR spectra of the mixed precipitates of Fe and REE and of Fe and Nd are similar to those of Fe oxyhydroxide. The mixed precipitates of Fe and REEs and of Fe and Nd, however, do not show the three characteristic peaks of carbonate ion (ν 3 , ν 2 and ν 4 ) shown by the IR spectra of CaCO 3 or reported by Caro and Lemaitre-Blaise (1969), Dexpert and Caro (1974), and Caro et al (1972). The FT-IR spectra of the mixed precipitates of Fe and REEs and of Fe and Nd also do not coincide with those of REE(OH) 3 or REEOOH (Klevtsov et al, 1967).…”

Section: Ft-ir Characterization Of Ree Coprecipitated With Fe Oxyhydrmentioning

confidence: 58%

“…FT-IR spectra of CaCO 3 in Fig. 3 (Caro and Lemaitre-Blaise, 1969;Dexpert and Caro, 1974;Caro et al, 1972). The REE or Nd contents were 1.7~3.5 × 10 -5 mol per 1 g of Fe-REE-KBr or Fe-Nd-KBr mixed powder samples for FT-IR analysis.…”

Section: Aging Effect On Log K D (Ree) and Ph Of The Experimental Systemmentioning

confidence: 99%

Rare earth element partitioning between Fe oxyhydroxide precipitates and aqueous NaCl solutions doped with NaHCO3: Determinations of rare earth element complexation constants with carbonate ions.

Ohta

Kawabe

2000

Geochem. J.

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The distribution coefficients of rare earth elements (REEs; all lanthanides except Pm, Y and Sc) between Fe oxyhydroxide precipitates and 0.5 M NaCl solutions with NaHCO 3 (0.0~12.0 mM) at 25°C and 1 bar have been determined. This experimental system is a simple model for REE partitioning between deep-sea ferromanganese nodules and seawater. The distribution coefficients, K d (REE: precipitate/solution), show systematic variations with increasing NaHCO 3 concentrations. We have determined REE(III)-carbonate complexation constants from the experimental distribution coefficients as a function of NaHCO 3 concentration and pH. The REE(III)-carbonate complexation constants show almost the same series variations as reported values obtained by the solvent-extraction method, although our results by the precipitation method are rather higher by 1.0~1.5 in log unit than the literature data at zero ionic strength. amine how REE(III)-carbonate complexation affects the REE partitioning process in seawater. Kawabe et al. (1999a, b) reported preliminary experimental results of REE partitioning between Fe oxyhydroxide precipitates and NaCl solutions with and without carbonate ions. They emphasized that the lanthanide tetrad effect is associated with the distribution coefficients of REEs between Fe oxyhydroxide precipitates and NaCl solutions. They analyzed their experimental results using the refined spin-pairing energy theory, RSPET, (Jørgensen, 1979;Kawabe, 1992). Although Kawabe et al. (1999b) estimated the complexation constants for REE(CO 3 ) 2 -from their experimental results, they could not estimate those for REECO 3 + from the preliminary data. REE(III)-carbonate complexation constants have been reported by Byrne and co-workers (Cantrell and

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“…[21,22] In the majority of reported crystal structures, the coordination sphere of the Ln 3+ ion consists only of the carbonate anions. The coordination number (C.N.)…”

Section: (H 2 O) 2 ]mentioning

confidence: 99%