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Synthesis of new mixed actinides oxalates as precursors of actinides oxide solid solutions
Ist Teil von
Journal of alloys and compounds, 2007-10, Vol.444, p.387-390
Ort / Verlag
Lausanne: Elsevier B.V
Erscheinungsjahr
2007
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
In an integrated fuel cycle such as considered for generation IV nuclear systems, actinides co-conversion processes play an important role by producing mixed actinides compounds used as starting materials for fuel re-fabrication. Among the different co-conversion routes considered, oxalic co-precipitation is one of the investigated ways to synthesised actinides mixed oxides. Oxalic co-conversion of a solution containing a tetravalent actinide An(IV) and a trivalent actinide An(III) under controlled conditions leads to the precipitation of two original series of mixed An(IV)–An(III) oxalate compounds (An(IV)
=
Th, Np, U or Pu and An(III)
=
Pu or Am) characterized by an unexpected An(IV)–An(III) crystallographic mixed site which induces a local homogeneity of the composition at a molecular scale. These families of mixed oxalates correspond to two solid solutions of type
M
2+
x
An
IV
2−
x
An
III
x
(C
2O
4)
5·
nH
2O and
M
1−
x
[An
III
1−
x
An
IV
x
(C
2O
4)
2·H
2O]·
nH
2O (
M
=
single charged cation), with hexagonal or tetragonal symmetry, respectively.