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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Ternary rare earth silicides RE2M3Si4 (RE = Sc, Y, Lu; M = Mo, W): crystal structure, coloring and electronic properties
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Ternary rare earth silicides RE2M3Si4 (RE = Sc, Y, Lu; M = Mo, W): crystal structure, coloring and electronic properties

机译:三元稀土硅化物RE2M3Si4(RE = Sc,Y,Lu; M = Mo,W):晶体结构,着色和电子性能

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The ternary compounds Sc2Mo3Si4, Y2Mo3Si4, Lu2Mo3Si4 and Sc2W3Si4 have been synthesized using arc melting and structurally characterized using single crystal X-ray diffraction. The compounds are isostructural with Gd5Si4 but with coloring (order of the rare earth and transition metals) on the Gd site. In contrast to group 4 and 5 ternaries of the same type, we observe no site mixing between the rare earth and transition metals. The Y compound displays a different, less common coloring from the others and through DFT calculations and investigation of the solid solution between Sc2Mo3Si4 and Y2Mo3Si4 it is shown that the different coloring of the latter is only marginally more stable. The electronic structures of the ternary compounds have been investigated using DFT calculations, yielding densities of states very similar to Gd5Si4. These predict metallic behavior and no magnetism, which is confirmed through resistivity and magnetization measurements.
机译:三元化合物Sc2Mo3Si4,Y2Mo3Si4,Lu2Mo3Si4和Sc2W3Si4已通过电弧熔化合成,并使用单晶X射线衍射进行了结构表征。这些化合物与Gd5Si4是同构的,但在Gd部位具有着色(稀土和过渡金属的顺序)。与相同类型的第4组和第5组三元形成对比,我们观察到稀土和过渡金属之间没有位点混合。 Y化合物显示出与其他化合物不同的,较少见的着色,并且通过DFT计算和对Sc2Mo3Si4和Y2Mo3Si4之间的固溶体的研究表明,后者的着色仅稍微稳定一点。已经使用DFT计算研究了三元化合物的电子结构,得出的态密度与Gd5Si4非常相似。这些可以预测金属行为,而没有磁性,这可以通过电阻率和磁化强度的测量得到证实。

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