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

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

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 P3c, 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.

Original languageAmerican English
Pages (from-to)11626-11635
Number of pages10
JournalDalton Transactions
Volume46
Issue number35
DOIs
StatePublished - 2017
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2017 The Royal Society of Chemistry.

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