Abstract
Single crystals of Na4.5Nd0.5UO6 were grown out of a molten hydroxide flux and characterized by single crystal X-ray diffraction. Na4.5Nd0.5UO6 crystallizes in the orthorhombic space group Fddd with a = 6.6574(5) A, b = 9.7031(6) A, and c = 20.1571(13) A. The material exhibits an ordered rock salt structure type. The uranium atoms are located in a distorted UO6 octahedral coordination environment containing two short, 2.056(4) A, and four long, 2.116(3) A, U–O bonds. The short bonds are significantly longer compared to what is typically observed for the uranyl cation, UO2 2+. The synthesis and crystal structure of a new complex uranium oxide, Na4.5Nd0.5UO6 are reported.
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