X-RAY SPECTROSCOPIC INVESTIGATIONS OF FLUIDS IN THE HYDROTHERMAL DIAMOND ANVIL CELL: THE HYDRATION STRUCTURE OF AQUEOUS LA3+ UP TO 300 °C AND 1600 BARS

Show simple item record

dc.contributor.author Anderson A.J.
dc.contributor.author Jayanetti S.
dc.contributor.author Mayanovic R.A.
dc.contributor.author Bassett W.A.
dc.contributor.author Chou I.M.
dc.date.accessioned 2021-10-16T12:26:12Z
dc.date.available 2021-10-16T12:26:12Z
dc.date.issued 2002
dc.identifier https://elibrary.ru/item.asp?id=32168085
dc.identifier.citation American Mineralogist, 2002, 87, 2-3, 262-268
dc.identifier.issn 0003-004X
dc.identifier.uri https://repository.geologyscience.ru/handle/123456789/30764
dc.description.abstract The first direct measurements are reported for the structure of the hydrated La3+ ion in an aqueous solution (containing 0.007 m La) over a range of temperatures from 25 to 300degreesC and pressures LIP to 1600 bars. The radial distribution of atoms around the La3+ ion was measured using the X-ray absorption fine structure (XAFS) technique. La L-3-edge spectra were collected in the fluorescence mode from nitrate solutions in a modified hydrothermal diamond anvil cell using the PNC-CAT X-ray microprobe at the Advanced Photon Source, Argonne National Laboratory. Analysis of the XAFS spectra collected at all temperatures indicates that each La3+ ion has a hydration number of nine and that the solvating waters surround the ion in a tricapped trigonal prismatic arrangement. As temperature is increased from 25 to 300degreesC, the bond distance between the equatorial-plane O atoms and the La3+ ion increases from 2.59 +/- 0.02 to 2.79 +/- 0.04 Angstrom, whereas the bond distance between La3+ and the O atoms at the ends of the prism decrease to 2.48 +/- 0.03 Angstrom. This Study also demonstrates the unique capability of the modified hydrothermal diamond anvil cell for in situ low energy X-ray spectroscopic analysis of elements in dilute aqueous solutions at elevated temperatures and pressures.
dc.title X-RAY SPECTROSCOPIC INVESTIGATIONS OF FLUIDS IN THE HYDROTHERMAL DIAMOND ANVIL CELL: THE HYDRATION STRUCTURE OF AQUEOUS LA3+ UP TO 300 °C AND 1600 BARS
dc.type Статья


Files in this item

Files Size Format View

There are no files associated with this item.

This item appears in the following Collection(s)

  • ELibrary
    Метаданные публикаций с сайта https://www.elibrary.ru

Show simple item record