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Title: Structures of polynuclear Th(IV) hydrolysis products.

Abstract

The hydrolysis chemistry of the tetravalent actinides is discussed based on recent studies with thorium. The coupling of high energy x-ray scattering and single crystal diffraction has provided insight into the structures of the polynuclear complexes formed by hydrolytic reactions of the tetravalent actinides. The success of these experiments with thorium presents many opportunities for the elucidation of the structures and thermodynamic quantities describing the dissolved polynuclear complexes of the heavier actinides.

Authors:
; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
971946
Report Number(s):
ANL/CHM/CP-58250
TRN: US201005%%71
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Conference
Resource Relation:
Conference: 2006 Materials Research Society Fall Meeting; Nov. 27, 2006 - Dec. 1, 2006; Boston, MA
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; ACTINIDES; CHEMISTRY; DIFFRACTION; HYDROLYSIS; MONOCRYSTALS; SCATTERING; THERMODYNAMICS; THORIUM

Citation Formats

Wilson, R. E., Skanthakumar, S., Soderholm, L., and Chemistry. Structures of polynuclear Th(IV) hydrolysis products.. United States: N. p., 2007. Web.
Wilson, R. E., Skanthakumar, S., Soderholm, L., & Chemistry. Structures of polynuclear Th(IV) hydrolysis products.. United States.
Wilson, R. E., Skanthakumar, S., Soderholm, L., and Chemistry. Mon . "Structures of polynuclear Th(IV) hydrolysis products.". United States. doi:.
@article{osti_971946,
title = {Structures of polynuclear Th(IV) hydrolysis products.},
author = {Wilson, R. E. and Skanthakumar, S. and Soderholm, L. and Chemistry},
abstractNote = {The hydrolysis chemistry of the tetravalent actinides is discussed based on recent studies with thorium. The coupling of high energy x-ray scattering and single crystal diffraction has provided insight into the structures of the polynuclear complexes formed by hydrolytic reactions of the tetravalent actinides. The success of these experiments with thorium presents many opportunities for the elucidation of the structures and thermodynamic quantities describing the dissolved polynuclear complexes of the heavier actinides.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

Conference:
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  • The hydrolysis chemistry of the tetravalent actinides is discussed based on recent studies with thorium. The coupling of high energy x-ray scattering and single crystal diffraction has provided insight into the structures of the polynuclear complexes formed by hydrolytic reactions of the tetravalent actinides. The success of these experiments with thorium presents many opportunities for the elucidation of the structures and thermodynamic quantities describing the dissolved polynuclear complexes of the heavier actinides. (authors)
  • In the framework of radwaste storage, the thorium phosphate-diphosphate Th{sub 4}(PO{sub 4}){sub 4}P{sub 2}O{sub 7} (TPD) has been synthesized in the ThO{sub 2}-P{sub 2}O{sub 5} system. This material is very resistant to aqueous corrosion. In this paper the authors report the conditions of synthesis of TPD doped with small amounts of trivalent actinides and of solid solutions with uranium (IV), neptunium (IV) and plutonium (IV). Sintered samples of TPD and Th{sub 4{minus}x}U{sub x}(PO{sub 4}){sub 4}P{sub 2}O{sub 7} (TUPD) have been prepared after pressing at 100--800 MPa at room temperature then heating at 1250 C for 10 hours. The corresponding densitymore » varies from 87 to 93% of the calculated value from crystal data. Leaching tests of Th{sub 4}(PO{sub 4}){sub 4}P{sub 2}O{sub 7} (TPPD) have been performed in water and in several acidic media at room temperature and at 90 C. The dependence of the leaching rate on the pH has been determined: the partial order related to [H{sub 3}O{sup +}] is in the 0.35--0.44 range while the apparent leaching rate is equal to about 1 x 10{sup {minus}5}-4x10{sup {minus}5} g(m{sup 2}.d).« less
  • This paper describes the use of a screening procedure to rank the content of polynuclear aromatic (PNA) species in synfuel samples. The ranking procedure is based on a cost-effectvie and rapid screening technique based on synchronous luminescence spectroscopy. The use of the screening procedure as a basis for screening of complex mixtures is discussed.
  • This paper describes the use of a screening procedure to rank the content of polynuclear aromatic (PNA) species in synfuel samples. The ranking procedure is a cost-effective and rapid screening technique based on synchronous luminescence spectroscopy. The use of the screening procedure as a basis for screening of complex mixtures will be discussed.