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Issue 42, 2015
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Structural investigation of Na3NpO4 and Na3PuO4 using X-ray diffraction and 237Np Mössbauer spectroscopy

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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.

Graphical abstract: Structural investigation of Na3NpO4 and Na3PuO4 using X-ray diffraction and 237Np Mössbauer spectroscopy

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Supplementary files

Article information


Submitted
08 Jun 2015
Accepted
23 Aug 2015
First published
08 Sep 2015

This article is Open Access

Dalton Trans., 2015,44, 18370-18377
Article type
Paper

Structural investigation of Na3NpO4 and Na3PuO4 using X-ray diffraction and 237Np Mössbauer spectroscopy

A. L. Smith, P. E. Raison, A. Hen, D. Bykov, E. Colineau, J.-P. Sanchez, R. J. M. Konings and A. K. Cheetham, Dalton Trans., 2015, 44, 18370
DOI: 10.1039/C5DT02168E

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