Mild hydrothermal crystal growth of new uranium(IV) fluorides, Na3.13Mg1.43U6F30 and Na2.50Mn1.75U6F30: Structures, optical and magnetic properties
作者： Jeongho Yeon , Mark D. Smith , Joshua Tapp , Angela Möller , Hans-Conrad zur Loye
DOI: 10.1016/J.JSSC.2015.04.036
关键词: Paramagnetism 、 Singlet state 、 Crystallography 、 Chemistry 、 Single crystal 、 Magnetization 、 Crystal structure 、 Magnetic susceptibility 、 Crystal growth 、 X-ray crystallography 、 Inorganic chemistry
摘要: Abstract Two new uranium(IV) fluorides, Na 3.13 Mg 1.43 U 6 F 30 ( 1 ) and 2.50 Mn 1.75 2 ), were synthesized through an in situ mild hydrothermal route, structurally characterized by single crystal X-ray diffraction. The compounds exhibit complex structures composed of corner- or edge-shared UF 9 M =Mg, Mn) polyhedra, forming hexagonal channels the three-dimensional framework, which ordered disordered divalent metal sodium atoms reside. large voids contain nearly regular M(II)F octahedra ions, whereas small cavities include M(II) ions on a mixed-occupied site. Magnetic susceptibility measurements yielded effective magnetic moments 8.36 11.6 µ B for , respectively, confirming presence oxidation states U(IV) Mn(II). negative Weiss constants indicate spin gap between triplet singlet state U(IV). Magnetization data as function applied fields revealed that exhibits paramagnetic behavior due to nonmagnetic ground at low temperature. UV–vis diffuse reflectance photoelectron spectroscopy also analyzed.
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