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

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

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)
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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.
Original languageEnglish
Pages (from-to)11626-11635
JournalDalton Transactions: the international journal for inorganic, organometallic and bioinorganic chemistry
Volume46
Issue number35
DOIs
Publication statusPublished - 23 Aug 2017

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