Title: A New Look at the Structural and Magnetic Properties of Potassium Neptunate K2NpO4 Combining XRD, XANES Spectroscopy, and Low-Temperature Heat Capacity
Authors: SMITH ANNACOLINEAU ERICGRIVEAU JEAN-CHRISTOPHEPOPA KARINKAURIC GUILLAUMEMARTIN PHILIPPESCHEINOST ANDREASCHEETHAM ANTHONYKONINGS RUDY
Citation: INORGANIC CHEMISTRY vol. 56 no. 10 p. 5839-5850
Publisher: AMER CHEMICAL SOC
Publication Year: 2017
JRC N°: JRC105947
ISSN: 0020-1669
URI: https://pubs.acs.org/doi/10.1021/acs.inorgchem.7b00462
http://publications.jrc.ec.europa.eu/repository/handle/JRC105947
DOI: 10.1021/acs.inorgchem.7b00462
Type: Articles in periodicals and books
Abstract: The physico-chemical properties of the potassium neptunate K2NpO4 have been investigated in this work using X-ray diraction, X-ray Absorption Near Edge Structure (XANES) spectroscopy at the Np-L3 edge, and low temperature heat capacity measurements. A Rietveld refinement of the crystal structure is reported for the first time. The Np(VI) valence state has been confirmed by the XANES data, and the absorption edge threshold of the XANES spectrum has been correlated to the Mössbauer isomer shift value reported in the literature. The standard entropy and heat capacity of K2NpO4 have been derived at 298.15 K from the low temperature heat capacity data. The latter suggest the existence of a magnetic ordering transition around 25.9 K, most probably of the ferromagnetic type.
JRC Directorate:Nuclear Safety and Security

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