Synthesis conditions and some properties of neptunium (IV) oxalates in which C/sub 2/O/sub 4//Np = 2. 5

Journal Article · Thu Sep 01 04:00:00 EDT 1988 · Sov. Radiochem. (Engl. Transl.); (United States)

OSTI ID:5774959

Bykhovskii, D N; Kuz'mina, M A; Maksimov, V F; Novikov, G S; Smirnov, A N; Solntseva, L V

A study was made of the formation of neptunium oxalates of the type M/sub 2/Np/sub 2//centered dot/(C/sub 2/O/sub 4/)/sub 5//centered dot/(7-9)H/sub 2/O, where M = H, NH/sub 4/, Na, K. It was found that the acid oxalate may crystallize out together with the normal hexahydrate of neptunium (IV) oxalate over a wide range of conditions, but it may be obtained in almost pure form when the initial neptunium concentration is (1-2)/centered dot/10/sup /minus/2/ M and the nitric acid concentration is above 3 M. Other salts are formed in the same conditions as the analogous thorium and uranium (IV) compounds. An analysis of the diffractograms shows the structural similarity of the acid oxalate to other salts, especially the ammonium salt. The IR spectra of the acid oxalate did not include absorption bands which could be ascribed to the bioxalate ion. The results indicate that the formula for this oxalate should be written in the form (H/sub 3/O)/sub 2/Np/sub 2/(C/sub 2/O/sub 4/)/sub 5//centered dot/7H/sub 2/O.

• OSTI ID: 5774959
• Journal Information: Sov. Radiochem. (Engl. Transl.); (United States), Journal Name: Sov. Radiochem. (Engl. Transl.); (United States) Vol. 30:1; ISSN SVRDA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602 -- Other Materials-- Structure & Phase Studies
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400702* -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
ACTINIDE COMPOUNDS
CARBOXYLIC ACID SALTS
CHALCOGENIDES
CHEMICAL COMPOSITION
COBALT COMPOUNDS
COBALT OXIDES
COHERENT SCATTERING
CRYSTAL STRUCTURE
CRYSTALLIZATION
DIFFERENTIAL THERMAL ANALYSIS
DIFFRACTION
HYDRATES
HYDROGEN COMPOUNDS
INFRARED SPECTRA
INORGANIC ACIDS
NEPTUNIUM COMPOUNDS
NITRIC ACID
OXALATES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PRECIPITATION
QUANTITY RATIO
SCATTERING
SEPARATION PROCESSES
SPECTRA
STRUCTURAL CHEMICAL ANALYSIS
SYNTHESIS
THERMAL ANALYSIS
TRANSITION ELEMENT COMPOUNDS
TRANSURANIUM COMPOUNDS
X-RAY DIFFRACTION