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利用差热分析及X射线粉末聚焦照相法研究了CsI—EuI_2体系的相图(723K以上部分).该体系的相图属于有三个三元化合物生成的低共熔型相图 其中CsEuI_3和Cs_3EuI_5为固液同组成化合物,它们的熔点分别为915K和814K,CsEu_2I_5为固液异组成化合物,分解温度为744K.生成两个低共熔物,其组成分别为14.3%和72.5%(以CsI摩尔百分数计),低共熔点分别为738K和804K.对新化合物——Cs_3EuI_5进行了磁性.XPS、荧光光谱、密度等方面的研究,晶体结构测定表明Cs_3EuI_5属六方晶系,α=1.4634(4)nm,с=1.8376(0)nm,r=120°,Z=8,D_c=4.619g·cm~(-3),D_m~(298)=4.549g·cm~(-3).
The phase diagram of the CsI-EuI 2 system (above 723K) was investigated by differential thermal analysis and X-ray powder focus photography.The phase diagram of the system belongs to the eutectic phase diagram with three ternary compounds, CsEuI_3 and Cs_3EuI_5 The solid-liquid composition compounds, which have melting points of 915K and 814K, respectively, and CsEu_2I_5 are solid-liquid heterostructures with a decomposition temperature of 744 K. Two eutectics were formed with a composition of 14.3% and 72.5%, respectively, in mole percent CsI ), And the eutectic points are 738K and 804K, respectively. The magnetic properties of the new compound, Cs_3EuI_5, XPS, fluorescence spectra and density have been studied. The crystal structure of Cs_3EuI_5 shows a hexagonal system with α = 1.4634 (4) nm , с = 1.8376 (0) nm, r = 120 °, Z = 8, D_c = 4.619g · cm -3 and D_m ~ 298 = 4.549g · cm -3.