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

被引:7
|
作者
Smith, Anna L. [1 ]
Colineau, Eric [2 ]
Griveau, Jean-Christophe [2 ]
Popa, Karin [2 ]
Kauric, Guilhem [3 ]
Martin, Philippe [4 ]
Scheinost, Andreas C. [5 ]
Cheetham, Anthony K. [6 ]
Konings, Rudy J. M. [2 ]
机构
[1] Delft Univ Technol, Radiat Sci & Technol Dept, Nucl Energy & Radiat Applicat, Mekelweg 15, NL-2629 JB Delft, Netherlands
[2] European Commiss, DG Joint Res Ctr JRC, Directorate G Nucl Safety & Secur, Postfach 2340, D-76125 Karlsruhe, Germany
[3] Chim ParisTech, ENSCP, 11 Rue Pierre & Marie Curie, F-75005 Paris, France
[4] CEA Marcoule, CEA, DEN, DMRC SFMA LCC, F-30207 Bagnols Sur Ceze, France
[5] Helmholtz Zentrum Dresden Rossendorf, Inst Resource Ecol, POB 10119, D-01314 Dresden, Germany
[6] Univ Cambridge, Dept Mat Sci & Met, 27 Charles Babbage Rd, Cambridge CB3 0FS, England
关键词
X-RAY-DIFFRACTION; THERMODYNAMIC FUNCTIONS; MOSSBAUER; ABSORPTION; NA4UO5; ORDER;
D O I
10.1021/acs.inorgchem.7b00462
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
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-L-3 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 118 been confirmed by the XANES data, and the absorption edge threshold of the XANES spectrum has been correlated to the Mossbauer isomer shift value reported in the literature. The standard entropy and heat,capacity of K2NpO4 have been: derived at 298.1$ 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.
引用
收藏
页码:5839 / 5850
页数:12
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