A New Look at the Structural and Magnetic Properties of Potassium Neptunate K2NpO4 Combining XRD, XANES Spectroscopy, and Low-Temperature Heat Capacity

Anna L. Smith; Eric Colineau; Jean Christophe Griveau; Karin Popa; Guilhem Kauric; Philippe M. Martin; Andreas C. Scheinost; Anthony K. Cheetham; Rudy J.M. Konings

doi:10.1021/acs.inorgchem.7b00462

A New Look at the Structural and Magnetic Properties of Potassium Neptunate K₂NpO₄ Combining XRD, XANES Spectroscopy, and Low-Temperature Heat Capacity

Anna L. Smith^*, Eric Colineau, Jean Christophe Griveau, Karin Popa, Guilhem Kauric, Philippe M. Martin, Andreas C. Scheinost, Anthony K. Cheetham, Rudy J.M. Konings

^*Corresponding author for this work

RST/Reactor Physics and Nuclear Materials

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Abstract

The physicochemical properties of the potassium neptunate K₂NpO₄ have been investigated in this work using X-ray diffraction, 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.

Original language	English
Pages (from-to)	5839-5850
Number of pages	12
Journal	Inorganic Chemistry: including bioinorganic chemistry
Volume	56
Issue number	10
DOIs	https://doi.org/10.1021/acs.inorgchem.7b00462
Publication status	Published - 15 May 2017

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Smith, A. L., Colineau, E., Griveau, J. C., Popa, K., Kauric, G., Martin, P. M., Scheinost, A. C., Cheetham, A. K., & Konings, R. J. M. (2017). A New Look at the Structural and Magnetic Properties of Potassium Neptunate K₂NpO₄ Combining XRD, XANES Spectroscopy, and Low-Temperature Heat Capacity. Inorganic Chemistry: including bioinorganic chemistry, 56(10), 5839-5850. https://doi.org/10.1021/acs.inorgchem.7b00462

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title = "A New Look at the Structural and Magnetic Properties of Potassium Neptunate K2NpO4 Combining XRD, XANES Spectroscopy, and Low-Temperature Heat Capacity",

abstract = "The physicochemical properties of the potassium neptunate K2NpO4 have been investigated in this work using X-ray diffraction, 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 M{\"o}ssbauer 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.",

author = "Smith, {Anna L.} and Eric Colineau and Griveau, {Jean Christophe} and Karin Popa and Guilhem Kauric and Martin, {Philippe M.} and Scheinost, {Andreas C.} and Cheetham, {Anthony K.} and Konings, {Rudy J.M.}",

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month = may,

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doi = "10.1021/acs.inorgchem.7b00462",

language = "English",

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Smith, AL, Colineau, E, Griveau, JC, Popa, K, Kauric, G, Martin, PM, Scheinost, AC, Cheetham, AK & Konings, RJM 2017, 'A New Look at the Structural and Magnetic Properties of Potassium Neptunate K₂NpO₄ Combining XRD, XANES Spectroscopy, and Low-Temperature Heat Capacity', Inorganic Chemistry: including bioinorganic chemistry, vol. 56, no. 10, pp. 5839-5850. https://doi.org/10.1021/acs.inorgchem.7b00462

A New Look at the Structural and Magnetic Properties of Potassium Neptunate K₂NpO₄ Combining XRD, XANES Spectroscopy, and Low-Temperature Heat Capacity. / Smith, Anna L.; Colineau, Eric; Griveau, Jean Christophe et al.
In: Inorganic Chemistry: including bioinorganic chemistry, Vol. 56, No. 10, 15.05.2017, p. 5839-5850.

Research output: Contribution to journal › Article › Scientific › peer-review

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AU - Smith, Anna L.

AU - Colineau, Eric

AU - Griveau, Jean Christophe

AU - Popa, Karin

AU - Kauric, Guilhem

AU - Martin, Philippe M.

AU - Scheinost, Andreas C.

AU - Cheetham, Anthony K.

AU - Konings, Rudy J.M.

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AB - The physicochemical properties of the potassium neptunate K2NpO4 have been investigated in this work using X-ray diffraction, 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.

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A New Look at the Structural and Magnetic Properties of Potassium Neptunate K₂NpO₄ Combining XRD, XANES Spectroscopy, and Low-Temperature Heat Capacity

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