Kaminaga Yusuke, Yamada Takahiro, Yamane Hisanori
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan.
Acta Crystallogr C. 2007 Jan;63(Pt 1):i10-12. doi: 10.1107/S0108270106039916. Epub 2006 Dec 23.
A new quaternary compound in the Ca-Eu-Sn-O system, namely calcium europium tin heptaoxide, Ca1.5 Eu3Sn0.5 O7, was prepared by solid-state reaction at 2073 K. All atoms in the structure are on 4i special positions (on mirrors) in space group C2/m. Ca/Eu sites are situated within two O octahedra and within two sevenfold coordination sites surrounded by O-capped trigonal prisms. A Ca/Eu/Sn site is coordinated by five O atoms. The structural formula can be represented as (Ca0.28 Eu0.72)(Ca0.16 Eu0.84)(Ca0.46 Eu0.54)(Ca0.28 Eu0.72)(Ca0.32 Eu0.18 Sn0.50)O7. The crystal structure is a new type and is related to the structure of B-form Eu2O3.
通过在2073 K下进行固态反应，在Ca-Eu-Sn-O体系中制备了一种新的四元化合物，即七氧化钙铕锡（Ca1.5 Eu3Sn0.5 O7）。结构中的所有原子都位于空间群C2/m的4i特殊位置（在镜面上）。Ca/Eu位点位于两个O八面体以及由O帽三角棱柱包围的两个七重配位位点内。一个Ca/Eu/Sn位点由五个O原子配位。结构式可表示为(Ca0.28 Eu0.72)(Ca0.16 Eu0.84)(Ca0.46 Eu0.54)(Ca0.28 Eu0.72)(Ca0.32 Eu0.18 Sn0.50)O7。该晶体结构是一种新型结构，与B型Eu2O3的结构相关。
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