八面体
结晶学
三角棱镜分子几何学
晶体结构
铕
三角晶系
碱金属
化学
稀土
群(周期表)
材料科学
离子
矿物学
有机化学
作者
Sabina Kovač,Predrag Dabić,Aleksandar Kremenović
标识
DOI:10.2298/jsc210218026k
摘要
As part of research on the flux technique for growing alkali rare-earth elements (REE) containing silicates, tripotassium europium disilicate, K3EuSi2O7, was synthesized and characterized by single-crystal X-ray diffraction. It crystallizes in the space group P63/mcm. In the crystal structure of the title compound, one part of the Eu cations are in a slightly distorted octahedral coordination and the other part are in an ideal trigonal prismatic coordination environment. The disilicate Si2O7 groups connect four EuO6 octahedra and one EuO6 trigonal prism. Three differently coordinated potassium cations are located between them. Silicates containing the larger rare earth elements usually crystallize in a structure that contains the rare-earth cation in both a slightly distorted octahedral and an ideal trigonal prismatic coordination environment.
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