Title: Structural investigation of Na3NpO4 and Na3PuO4 using X-ray diffraction and 237Np Mössbauer spectroscopy
Authors: SMITH ANNARAISON PhilippeHEN AMIRBYKOV D.COLINEAU EricSANCHEZ Jean-PierreKONINGS RudyCHEETHAM Anthony
Citation: DALTON TRANSACTIONS vol. 44 no. 42 p. 18370 - 18377
Publisher: ROYAL SOC CHEMISTRY
Publication Year: 2015
JRC N°: JRC95483
ISSN: 1477-9226
URI: http://pubs.rsc.org/en/Content/ArticleLanding/2015/DT/C5DT02168E#!divAbstract
http://publications.jrc.ec.europa.eu/repository/handle/JRC95483
DOI: 10.1039/c5dt02168e
Type: Articles in periodicals and books
Abstract: α-Na3NpO4 and α-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.
JRC Directorate:Nuclear Safety and Security

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