Crystal Structure and Stability in Aqueous Solutions of Na0.5[NpO2(OH)1.5]•0.5H2O and Na[NpO2(OH)2]

被引：3
|
作者：
Fellhauer, David [2 ]
Lee, Jun-Yeop [1 ]
DiBlasi, Nicole A. [2 ]
Walter, Olaf [3 ]
Gaona, Xavier [2 ]
Schild, Dieter [2 ]
Altmaier, Marcus [2 ]
机构：
[1] Pusan Natl Univ, Sch Mech Engn, Busan 46241, South Korea
[2] Karlsruhe Inst Technol, Inst Nucl Waste Disposal, D-76021 Karlsruhe, Germany
[3] European Commiss, Joint Res Ctr Karlsruhe, D-76125 Karlsruhe, Germany
来源：
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2022年 / 144卷 / 21期
关键词：
NP(V);
D O I：
10.1021/jacs.2c03479
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The ternary neptunium(V) (Np(V)) hydroxides Na-0.5[NpO2(OH)(1.5)]center dot 0.5H(2)O (I) and Na[NpO2(OH)(2)] (II) were synthesized in aqueous NaOH solutions at T = 80 degrees C, and their crystal structures were determined to be monoclinic, P2(1), Z = 2, a = 5.9859(2), b = 10.1932(3), c = 12.1524(4) angstrom, beta = 98.864(1)degrees, V = 732.63(4) A(3) for (I) and orthorhombic, P2(1)2(1)2(1), Z = 4, a = 5.856(7), b = 7.621(9), c = 8.174(9) angstrom, V = 364.8(7) angstrom(3) for (II). By combining the detailed structural information with results from systematic solubility investigations, a comprehensive chemical and thermodynamic model of the Np(V) behavior in NaCl-NaOH solutions was evaluated. The results reveal a great stability of the ternary Na-Np(V)-OH solid phases that significantly enhances the predominance field of the entire Np(V) redox state to high alkalinity.
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页码：9217 / 9221
页数：5
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