Structure of solid compounds of neptunium(VII). V. Crystal structure of K/sub 3/NpO/sub 4/(OH)/sub 2/. 2H/sub 2/O

Journal Article · · Sov. Radiochem. (Engl. Transl.); (United States)

OSTI ID:6821975

Tomilin, S V; Volkov, Yu F; Visyashcheva, G I; Kapshukov, I I

The crystal structure of the heptavalent neptunium compound K/sub 3/NpO/sub 4/(OH)/sub 2/.2H/sub 2/O was determined. The crystals are monoclinic, and the crystal lattice parameters are as follows: a = 0.774(3), b = 0.786 (3), c = 0.840 (4) nm, ..gamma.. = 119.5 (3)/sup 0/, space group P2/sub 1//a, Z = 2, rho/sub calc/ = 3.66 g/cm/sup 3/. The structure was determined by means of three-dimensional x-ray photographic data by the heavy atom method and was refined by the method of least squares in anisotropic approximation (1227 reflections, R = 0.118). The structure is composed of complex anions (NpO/sub 4/(OH)/sub 2/)/sup 3 -/, K/sup +/ cations, and molecules of water of crystallization. The centrosymmetric complex anion (NpO/sub 4/(OH)/sub 2/)/sup 3 -/ has the form of an almost regular tetrahedral bipyramid with four oxygen atoms at the base and with the oxygen atoms of the OH groups at the vertices in the axial direction. The four paired Np-O distances are 0.191 and 0.188 nm, and the Np-O/sub (OH)/ distance is 0.240 nm.

• OSTI ID: 6821975
• Journal Information: Sov. Radiochem. (Engl. Transl.); (United States), Vol. 25:1; Other Information: Translated from Radiokhimiya (USSR); 25: No. 1, 58-62(Jan-Feb 1983)
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
NEPTUNIUM COMPOUNDS
CRYSTAL STRUCTURE
BOND LENGTHS
EXPERIMENTAL DATA
HYDRATES
LATTICE PARAMETERS
OXYGEN
POTASSIUM COMPOUNDS
X-RAY DIFFRACTION
ACTINIDE COMPOUNDS
ALKALI METAL COMPOUNDS
COHERENT SCATTERING
DATA
DIFFRACTION
DIMENSIONS
ELEMENTS
INFORMATION
LENGTH
NONMETALS
NUMERICAL DATA
SCATTERING
TRANSURANIUM COMPOUNDS
400702* - Radiochemistry & Nuclear Chemistry- Properties of Radioactive Materials