Synthesis and investigation of neptunium zirconium phosphate, a member of the NZP family: crystal structure, thermal behaviour and Mössbauer spectroscopy studies

Title

Synthesis and investigation of neptunium zirconium phosphate, a member of the NZP family: crystal structure, thermal behaviour and Mössbauer spectroscopy studies

 Author

Bykov, D. (TU Delft RST/Reactor Physics and Nuclear Materials)
Konings, R.J.M. (European Commission Joint Research Centre, Institute for Transuranium Elements Karlsruhe)
Apostolidis, C. (European Commission Joint Research Centre, Institute for Transuranium Elements Karlsruhe)
Hen, A. (European Commission Joint Research Centre, Institute for Transuranium Elements Karlsruhe)
Colineau, E (European Commission Joint Research Centre, Institute for Transuranium Elements Karlsruhe)
Wiss, T (European Commission Joint Research Centre, Institute for Transuranium Elements Karlsruhe)
Raison, P. (European Commission Joint Research Centre, Institute for Transuranium Elements Karlsruhe)

Date

2017-08-23

 Abstract

A new double neptunium zirconium phosphate of the type MxZr2(PO4)3 (M = Np), crystallizing in the structure type NaZr2(PO4)3 (NZP, NASICON), was synthesized by solid state reactions at high temperatures and characterized by X-ray diffraction, infrared spectroscopy and Mössbauer spectroscopy. The Rietveld refinement of the XRD pattern together with the analysis of the IR spectra of the sample confirmed the space group P[3 with combining macron]c, the same as that for the lanthanide analogues Ln0.33Zr2(PO4)3. However, Mössbauer studies revealed the presence of neptunium in the two oxidation states +3 and +4, indicating a two-phase NZP system with different crystallographic environments of the neptunium atoms. The thermal behaviour of the sample was followed up to 1400 °C by thermogravimetric analysis.

 To reference this document use:

http://resolver.tudelft.nl/uuid:39842aed-a9b1-412e-bb61-56428c90112b

 DOI

https://doi.org/10.1039/C7DT02110K

 ISSN

1477-9226

 Source

Dalton Transactions: the international journal for inorganic, organometallic and bioinorganic chemistry, 46 (35), 11626-11635

 Part of collection

Institutional Repository

 Document type

journal article

 Rights

© 2017 D. Bykov, R.J.M. Konings, C. Apostolidis, A. Hen, E Colineau, T Wiss, P. Raison
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