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Smith AL, Hen A, Magnani N, Sanchez JP, Colineau E, Griveau JC, Raison PE, Caciuffo R, Konings RJM, Cheetham AK. Mössbauer spectroscopy, magnetization, magnetic susceptibility, and low temperature heat capacity of α-Na₂NpO₄. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:086002. [PMID: 26823458 DOI: 10.1088/0953-8984/28/8/086002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The physical and chemical properties at low temperatures of hexavalent disodium neptunate α-Na2NpO4 are investigated for the first time in this work using Mössbauer spectroscopy, magnetization, magnetic susceptibility, and heat capacity measurements. The Np(VI) valence state is confirmed by the isomer shift value of the Mössbauer spectra, and the local structural environment around the neptunium cation is related to the fitted quadrupole coupling constant and asymmetry parameters. Moreover, magnetic hyperfine splitting is reported below 12.5 K, which could indicate magnetic ordering at this temperature. This interpretation is further substantiated by the existence of a λ-peak at 12.5 K in the heat capacity curve, which is shifted to lower temperatures with the application of a magnetic field, suggesting antiferromagnetic ordering. However, the absence of any anomaly in the magnetization and magnetic susceptibility data shows that the observed transition is more intricate. In addition, the heat capacity measurements suggest the existence of a Schottky-type anomaly above 15 K associated with a low-lying electronic doublet found about 60 cm(-1) above the ground state doublet. The possibility of a quadrupolar transition associated with a ground state pseudoquartet is thereafter discussed. The present results finally bring new insights into the complex magnetic and electronic peculiarities of α-Na2NpO4.
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Affiliation(s)
- Anna L Smith
- European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements (ITU), PO Box 2340, D-76125 Karlsruhe, Germany. Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK
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Smith AL, Hen A, Raison PE, Colineau E, Griveau JC, Magnani N, Sanchez JP, Konings RJM, Caciuffo R, Cheetham AK. X-ray Diffraction, Mössbauer Spectroscopy, Magnetic Susceptibility, and Specific Heat Investigations of Na4NpO5 and Na5NpO6. Inorg Chem 2015; 54:4556-64. [DOI: 10.1021/acs.inorgchem.5b00462] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Anna L. Smith
- European Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany
- Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom
| | - Amir Hen
- European Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany
| | - Philippe E. Raison
- European Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany
| | - Eric Colineau
- European Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany
| | - Jean-Christophe Griveau
- European Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany
| | - Nicola Magnani
- European Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany
| | - Jean-Pierre Sanchez
- CEA, INAC-SPSMS, FR-38000 Grenoble, France
- Université de Grenoble Alpes, INAC-SPSMS, FR-38000 Grenoble, France
| | - Rudy J. M. Konings
- European Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany
| | - Roberto Caciuffo
- European Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany
| | - Anthony K. Cheetham
- Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom
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Müller-Buschbaum H. Zur Kristallchemie von Oxoniccolaten der Alkali-, Erdalkali- und Seltenerdmetalle. Z Anorg Allg Chem 2011. [DOI: 10.1002/zaac.201000443] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Ivanov SA, Nordblad P, Mathieu R, Tellgren R, Ritter C. Neutron diffraction studies and the magnetism of an ordered perovskite: Ba2CoTeO6. Dalton Trans 2010; 39:5490-9. [PMID: 20449510 DOI: 10.1039/b927498g] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- S A Ivanov
- Department of Inorganic Materials, Karpov' Institute of Physical Chemistry, Vorontsovo pole, 10 105064, Moscow K-64, Russia.
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Chernorukov NG, Knyazev AV, Dashkina ZS. Crystal structure of the perovskites Ba2AIIUO6 (AII = Zn, Cd, Pb). RADIOCHEMISTRY 2009. [DOI: 10.1134/s1066362209020027] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Preparation, crystal structure and magnetic behavior of new double perovskites Sr2B′UO6 with B′=Mn, Fe, Ni, Zn. J SOLID STATE CHEM 2007. [DOI: 10.1016/j.jssc.2007.03.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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