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首页> 外文期刊>Zeitschrift fur Naturforschung, B. A Journal of Chemical Sciences >Intermetallic cadmium compounds M _5T _2Cd (M = Ca, Yb, Eu; T = Cu, Ag, Au) with Mo _5B _2Si-type structure
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Intermetallic cadmium compounds M _5T _2Cd (M = Ca, Yb, Eu; T = Cu, Ag, Au) with Mo _5B _2Si-type structure

机译：具有Mo _5B _2Si型结构的金属间镉化合物M _5T _2Cd（M = Ca，Yb，Eu; T = Cu，Ag，Au）

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摘要

The intermetallic compounds M _5T _2Cd (M = Ca, Yb, Eu; T = Cu, Ag, Au) and Yb _5Cu _2Zn were synthesized by melting the elements in sealed tantalum tubes followed by annealing at 923 K. All phases were characterized on the basis of powder and single-crystal X-ray diffraction data: Mo _5B _2Si type, I4/mcm, Z = 4, a = 828.7(1), c = 1528.1(3) pm, wR2 = 0.030, 440 F ~2 values, 16 variables for Eu _5Cu _2Cd, a = 788.2(1), c = 1459.3(5) pm, wR2 = 0.053, 378 F ~2 values, 16 variables for Yb _5Cu _2Cd, and a = 797.2(1), c = 1438.8(3) pm, wR2 = 0.036, 386 F ~2 values, 17 variables for Yb _5Au _(2.19)Cd _(0.81), which shows a small degree of Au / Cd mixing. The M _5T _2Cd structures are intergrowth variants of slightly distorted CuAl _2- and U _3Si _2-related slabs. Striking coordination motifs (exemplary for Eu _5Cu _2Cd) are square antiprisms of the Eu atoms around Cd, Eu _8 square prisms around Eu, and trigonal Eu6 prisms around Cu within the AlB _2-related slab. Temperature-dependent magnetic susceptibility measurements showed Pauli paramagnetism for Yb _5Cu _2Zn, indicating purely divalent ytterbium. Eu _5Au _2Cd exhibits Curie-Weiss behavior above 100 K with an experimental magnetic moment of 8.14 μ B per Eu atom and a Weiss constant of 56 K. Antiferromagnetic ordering of the EuII magnetic moments is evident at 36 K, and a metamagnetic transition is observed at 25 K and 13 kOe.
机译：金属间化合物M _5T _2Cd（M = Ca，Yb，Eu; T = Cu，Ag，Au）和Yb _5Cu _2Zn是通过在密封的钽管中熔化元素并在923 K进行退火而合成的。粉末和单晶X射线衍射数据的基础：Mo _5B _2Si型，I4 / mcm，Z = 4，a = 828.7（1），c = 1528.1（3）pm，wR2 = 0.030，440 F〜2值，Eu _5Cu _2Cd的16个变量，a = 788.2（1），c = 1459.3（5）pm，wR2 = 0.053，378 F〜2值，Yb _5Cu _2Cd的16个变量，a = 797.2（1），c = 1438.8（3）pm，wR2 = 0.036，386 F〜2值，Yb _5Au _（2.19）Cd _（0.81）的17个变量，表明Au / Cd混合程度较小。 M _5T _2Cd结构是与CuAl _2和U _3Si _2相关的轻微变形平板的共生变体。显着的配位图案（以Eu _5Cu _2Cd为例）是与AlB _2相关的平板中围绕Cd的Eu原子，围绕Eu的Eu _8方形棱镜和围绕Cu的三角形Eu6棱镜的方形反棱镜。随温度变化的磁化率测量结果显示，Yb _5Cu _2Zn具有保利顺磁性，表明是纯二价。 Eu _5Au _2Cd在100 K以上具有居里-魏斯行为，每个Eu原子的实验磁矩为8.14μB，Weiss常数为56K。EuII磁矩的反铁磁有序在36 K时很明显，并且观察到亚磁跃迁在25 K和13 kOe下。

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