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- W1965215599 abstract "The study of curium iodate, Cm(IO3)3, was undertaken as part of a systematic investigation of the 4f- and 5f-elements’ iodates. The reaction of 248CmCl3 with aqueous H5IO6 under mild hydrothermal conditions results in the reduction of IO65− to IO3− anions, and the subsequent formation of Cm(IO3)3 single crystals. Crystallographic data are: (193 K, MoKα, λ=0.71073Å): monoclinic, space group P21/c, a=7.2014(7)Å, b=8.5062(9)Å, c=13.4622(14)Å, β=100.142(2)°, V=811.76(14), Z=4, R(F)=2.11%, Rw(Fo2)=4.43% for 119 parameters with 1917 reflections with I>2σ(I). The structure consists of Cm3+ cations bound by iodate anions to form [Cm(IO3)8] units, where the local coordination environment around the curium centers can be described as a distorted dodecahedron. There are three crystallographically unique iodate anions within the structure; two iodates bridge between three Cm centers, and one iodate bridges between two Cm centers and has a terminal oxygen atom. The bridging of the curium centers by the iodate anions creates a three-dimensional structure. Three strong Raman bands with comparable intensities were observed at 846, 804, and 760 cm−1 and correspond to the I–O symmetric stretching of the three crystallographically distinct iodate ions. The Raman profile suggests a lack of inter-ionic vibrational coupling of the I–O stretching, while intra-ionic coupling provides symmetric and asymmetric components that correspond to each iodate site. Repeated collection of X-ray diffraction data for a crystal of Cm(IO3)3 over a period of time revealed a gradual expansion of the unit cell from self-irradiation. After 71 days, the new parameters were: a=7.2132(7)Å, b=8.5310(8)Å, c=13.505(1)Å, β=100.021(2)°, V=818.3(2)." @default.
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- W1965215599 date "2004-12-01" @default.
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- W1965215599 title "Hydrothermal synthesis, structure, Raman spectroscopy, and self-irradiation studies of 248Cm(IO3)3" @default.
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- W1965215599 doi "https://doi.org/10.1016/j.jssc.2004.09.015" @default.
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