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Title: Structural investigation of Na3NpO4 and Na3PuO4 using X-ray diffraction and 237Np Mössbauer spectroscopy
Authors: Smith, A.L
Raison, P.E
Hen, A
Bykov, D
Colineau, E
Sanchez, J.-P
Konings, R.J.M
Cheetham, A.K 
Keywords: Neptunium
Rietveld refinement
Single crystals
X ray diffraction
Local structural properties
Neptunium compounds
Orthorhombic structures
Quadrupole coupling constants
Ssbauer spectroscopies
Structural analogue
Structural investigation
X-ray rietveld refinements
Sodium compounds
Issue Date: 2015
Citation: Smith, A.L, Raison, P.E, Hen, A, Bykov, D, Colineau, E, Sanchez, J.-P, Konings, R.J.M, Cheetham, A.K (2015). Structural investigation of Na3NpO4 and Na3PuO4 using X-ray diffraction and 237Np Mössbauer spectroscopy. Dalton Transactions 44 (42) : 18370-18377. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: ?-Na3NpO4 and ?-Na3PuO4 exhibit an orthorhombic structure (Z = 8), in space group Fmmm, with lattice parameters a = 13.352(2) Å, b = 9.629(2) Å, and c = 6.673(2) Å for the neptunium compound, and a = 13.302(2) Å, b = 9.634(2) Å, and c = 6.651(2) Å for the plutonium analogue. The corresponding structure has been solved ab initio as no structural analogue could be found in the literature. The pentavalent state of neptunium has moreover been confirmed by 237Np Mössbauer spectroscopy, and the local structural properties inferred from the X-ray Rietveld refinement have been related to the fitted quadrupole coupling constant and asymmetry parameters. The existence of a low temperature metastable m phase of Na3NpO4 and Na3PuO4, of the NaCl type, has also been suggested. © 2015 The Royal Society of Chemistry.
Source Title: Dalton Transactions
ISSN: 14779226
DOI: 10.1039/c5dt02168e
Rights: Attribution 4.0 International
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