Flux versus Hydrothermal Growth: Polymorphism of A<sub>2</sub>(UO<sub>2</sub>)Si<sub>2</sub>O<sub>6</sub> (A = Rb, Cs)
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https://figshare.com/articles/dataset/Flux_versus_Hydrothermal_Growth_Polymorphism_of_A_sub_2_sub_UO_sub_2_sub_Si_sub_2_sub_O_sub_6_sub_A_Rb_Cs_/4570408
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资源简介：
Single
crystals of two new uranyl silicates were grown from mixed alkali
fluoride/alkali chloride fluxes. Polymorphism is observed in Cs2(UO2)Si2O6, where hydrothermal
conditions lead to the α polymorph and flux growth favors the
β polymorph. Rb2(UO2)Si2O6 crystallizes in a monoclinic distortion of the α-Cs2(UO2)Si2O6 structure type
with space group I2/a and lattice
parameters a = 14.9932(5) Å, b = 14.8032(5) Å, c = 16.2377(9) Å, and
β = 90.7220(10)°. β-Cs2(UO2)Si2O6 constitutes a new polymorph of Cs2(UO2)Si2O6 and crystallizes
in the monoclinic space group C2 with lattice parameters a = 12.136(2) Å, b = 10.0426(17) Å, c = 7.7896(13) Å, and β = 95.849(4)°. The
two structures are compared, the driving force behind the observed
polymorphism is discussed, and the luminescence properties are reported
for each compound.
创建时间：
2017-01-20
