Title: Synthesis and investigation of neptunium zirconium phosphate, a member of the NZP family: crystal structure, thermal behaviour and Mössbauer spectroscopy studies
Authors: BYKOV DENISKONINGS RUDYAPOSTOLIDIS CHRISTOSHEN AMIRCOLINEAU ERICWISS THIERRYRAISON PHILIPPE
Citation: DALTON TRANSACTIONS vol. 46 no. 35 p. 11626-11635
Publisher: ROYAL SOC CHEMISTRY
Publication Year: 2017
JRC N°: JRC102134
ISSN: 1477-9226
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC102134
DOI: 10.1039/c7dt02110k
Type: Articles in periodicals and books
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.
JRC Directorate:Nuclear Safety and Security

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