The incorporation of europium into apatite: anew explanation
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Kiel S. Holliday
Abstract
Time resolved laser fluorescence spectroscopy (TRLFS) and X-ray absorption fine structure (XAFS) are used as complimentary techniques to show that the hetero-valent incorporation of europium into apatite at temperatures relevant to environmental and biological processes occurs at grain boundaries and not the crystallographic calcium sites as previously presumed. For this study, we focus on mechanisms at the solid solution interface and therefore define this temperature regime as the range in which liquid water exists (0–100 ºC). Site-selective TRLFS show that the local Eu3+ symmetry does not match the presumed crystallographic site of incorporation. This is confirmed by XAFS results that show a deviation from the local environment in apatite. The transition of this amorphous europium to acrystallographic calcium site upon heating is then explained by grain growth and followed through a transition species by TRLFS.
© by Oldenbourg Wissenschaftsverlag, München, Germany
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Articles in the same Issue
- Cross section measurements of a few threshold reactions induced by fast neutrons from an Am/Be source: integral tests of differential neutron reaction cross section data
- Prediction of the thermal release of transactinide elements (112 ≤ Z ≤ 116) from metals
- Complexation thermodynamics and structural studies of trivalent actinide and lanthanide complexes with DTPA, MS-325 and HMDTPA
- Synthesis and characterization of thorium, uranium and cerium oxide nanoparticles
- Improved radioanalytical method for the simultaneous determination of Th, U, Np, Pu and Am(Cm) on a single TRU column by alpha spectrometry and ICP-MS
- Electrochemical reduction of U(VI) in H2SO4 at gold nanoporous film electrode
- The redox chemistry of neptunium in γ-irradiated aqueous nitric acid
- The incorporation of europium into apatite: anew explanation
- Instrumental neutron activation analysis for the study of size-fractionated airborne particulate matter samples
