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Träfflista för sökning "WFRF:(Frech M) srt2:(2005-2009)"

Sökning: WFRF:(Frech M) > (2005-2009)

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1.
  • Burba, Christopher M., et al. (författare)
  • Detecting unalloyed tin in LiSn2(PO4)3-based anodes with Mössbauer spectroscopy
  • 2009
  • Ingår i: Journal of Solid State Electrochemistry. - : Springer Science and Business Media LLC. - 1432-8488 .- 1433-0768. ; 13:8, s. 1267-1272
  • Tidskriftsartikel (refereegranskat)abstract
    • The first discharge of the Li+ ion anode material LiSn2(PO4)3 was investigated with Mössbauer spectroscopy and electrochemical techniques. Mössbauer spectroscopy provided insight into the structure of the tin atoms of the fully discharged anode materials. Spectra consist of overlapping peaks, which are assigned to noncrystalline β-Sn and Li–Sn alloy domains. An analysis of the relative intensities of the Mössbauer spectra shows the relative abundance of β-Sn increases at the expense of the Li–Sn alloy as the discharge rate increases. Cell polarization occurs at higher discharge rates, leading to inefficient electrode utilization and poor cycling performance. Sluggish Li+ ion diffusion through the amorphous Li3PO4 network that is formed early in the discharge process might be responsible for the poor electrochemical performance and the accumulation of unalloyed tin.
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2.
  • Szefer, P, et al. (författare)
  • Heavy-metal pollution of sediments from the Polish exclusive economic zone, southern Baltic Sea
  • 2009
  • Ingår i: Environmental Geology. - Berlin / Heidelberg : Springer. - 0943-0105 .- 1432-0495. ; 57:4, s. 847-862
  • Tidskriftsartikel (refereegranskat)abstract
    • Analysis of 59 surface sediment samples from the Polish exclusive economic zone (EEZ) shows that Szczecin Lagoon sediments are the most polluted by heavy metals and that the degree of heavy-metal pollution decreases substantially on passing from the Szczecin Lagoon to the Pomeranian Bay and the inner shelf area and then on passing to the Bornholm Deep and Słupsk Furrow. Heavy-metal pollution in the sediments of the western part of the Polish EEZ therefore appears to follow the dispersion of the Oder River. Fluffy material from the Oder estuary appears to be the main source of heavy metals in the muddy sediments of the Bornholm Deep. The formation of sulphides is therefore not the principal factor controlling the enrichment of heavy metals in the sediments of this anoxic basin, although it may be responsible for the uptake of Mo, Sb and As. Two main factors control the distribution of the rare earth elements (REE) in sediments of the Polish EEZ: the input of Fe-organic colloids from rivers and the presence of detrital material in the sediments.
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