The structural and electronic properties of Na4UO5 and Na4NpO5

Bickel, M.; Kanellakopulos, Β.; Powietzka, B.

doi:10.1016/0022-5088(91)90061-8

Cited by 11 publications

(10 citation statements)

References 7 publications

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“…The compound crystallizes in the tetragonal I4/m space group with a=7.5172(1)Å and c=4.6325(2)Å. Our unit cell parameters are in agreement with those reported previously (a=7.536Å and c=4.630Å) [2,4,7,28], albeit not as precise as our values of a=7.5172(1)Å and c=4.6325(2)Å. The uranium is located in an octahedral coordination environment, while the sodium is found in a distorted square pyramidal coordination environment.…”

Section: Resultssupporting

confidence: 90%

“…It is well known that uranium can take on different oxidation states in oxides and, hence, many research groups have investigated the synthesis, characterization and physical property measurements of diverse complex uranium oxides [1][2][3][4][5][6]. Both title compounds, K 2 UO 4 and Na 4 UO 5 , have been studied as part of such general investigations of uranium oxides [2,4,[7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Crystal growth of K2UO4 and Na4UO5 using hydroxide fluxes

Roof

Smith

Loye

2010

Journal of Crystal Growth

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Crystal growth of K2UO4 and Na4UO5 using hydroxide fluxes

Roof

Smith

Loye

2010

Journal of Crystal Growth

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“…We note that a recent X-ray powder diffraction and vibrational spectroscopic study of the structures of/3-Na4UO5 and fl-NaaNpO5 has been published [16]. Our results are consistent with this work as well as with the original X-ray powder diffraction studies of these compounds [3,4,10].…”

Section: Resultssupporting

confidence: 82%

Structural studies of Li5ReO6, Li4NpO5 and Li5NpO6 by neutron and X-ray powder diffraction

Morss

Appelman

Gerz

et al. 1994

Journal of Alloys and Compounds

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This paper reports on the preparation of Li5ReOr, Li4NpO5 and LisNpO6 by solid-state reactions, the results of X-ray and neutron powder diffraction measurements on all three compounds, and the determination of the structures of Li5ReO6 and Li,NpO5 from the neutron data. The neutron powder diffraction refinement for LisReO6 confirms a recent single-crystal X-ray diffraction study: monoclinic, space group C2/m. This structure is retained by LisReO6 between 298 K and 10 K. The neutron powder diffraction refinement for Li4NpO5 confirms earlier X-ray powder diffraction results: tetragonal, space group I4/rn, a = 6.698/~, c = 4.415 /~. The lithium and oxygen positional parameters of Li4NpO5 have been refined: coordination about Np is an extended octahedron, with each Np ion surrounded equatorially by four oxygen ions at 2.00 ~ and axially by two oxygen ions at 2.21 ~. Li5NpO6 shows an X-ray powder pattern consistent with the original report, but the neutron diffraction data set could not be refined in terms of the originally proposed space group or any other plausible model structure.

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“…The cation-rich uranates M 2 II UO 5 (M ) Ca, Sr) 24 and M 4 UO 5 (M ) Li, Na) 50,51 contain infinite chains of elongated UO 4 e O 2/2 a "reverse uranyl" octahedra (Figure 1). In the alkaline earth derivatives M 2 UO 5 the oxygen atoms are all four-coordinate, leading to seven-coordination for the alkaline earth counterions (Table 3).…”

Section: Cation-rich Structures With Z/x >mentioning

confidence: 99%