ic5b01390_si_001.pdf (59.4 kB)
K2Ca4[(UO2)(Si2O7)2]: A Uranyl Silicate with a One-Dimensional Chain Structure
journal contribution
posted on 2015-09-08, 00:00 authored by Chia-Lin Liu, Hsin-Kuan Liu, Wen-Jung Chang, Kwang-Hwa LiiA new
uranyl silicate, K2Ca4[(UO2)(Si2O7)2], with a 1D chain structure has
been synthesized from a solution of mixed alkali- and alkaline-earth-metal
cations under hydrothermal conditions at 550 °C and 1400 bar
and characterized by single-crystal X-ray diffraction and photoluminescence
spectroscopy. It crystallizes in the triclinic space group P1̅ (No. 2) with a = 6.6354(2) Å, b = 6.6791(2) Å, c = 9.6987(3) Å,
α = 98.324(2)°, β = 93.624(2)°, γ = 112.310(2)°,
and Z = 1. Its crystal structure consists of a 1D
chain of uranyl disilicate formed of corner-sharing UO6 tetragonal bipyramids and Si2O7 double groups.
The adjacent chains are separated by K+ and Ca2+ cations. It is the first example of uranyl silicate with a 1D chain
structure.