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首页> 外文期刊>Zeitschrift fur Naturforschung, B. A Journal of Chemical Sciences >Zinc-lead ordering in equiatomic rare earth plumbides REZnPb (RE= La-Nd and Sm-Tb)
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Zinc-lead ordering in equiatomic rare earth plumbides REZnPb (RE= La-Nd and Sm-Tb)

机译:等原子稀土铅化物REZnPb中的锌铅有序(RE=La-Nd和Sm-Tb)

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摘要

The plumbides REZnPb (RE= rare earth metals La-Nd and Sm-Tb) were synthesized by induction melting of the elements in sealed niobium ampoules. The samples were characterized by X-ray powder diffraction. The structures of the praseodymium and neodymium compound were refined from single-crystal X-ray diffractometer data: YPtAs type, P6(3)/mmc, a = 461.32(8), c=1658.00(3) pm, wR2= 0.0588, 267 F-2 values, 12 variables for PrZnPb and a= 460.12(3), c=1642.7(1), wR2= 0.0617, 243 F-2 values, 12 variables for NdZnPb. The plumbides with RE= La, Ce, Sm, Gd and Tb are isotypic while the Zintl phase EuZnPb crystallizes with the orthorhombic TiNiSi type, Pnma, a= 796.6(2), b= 482.53(9), c= 822.9(2) pm. The zinc and lead atoms build up polyanionic networks: slightly puckered Zn3Pb3 layers in AA'BB' stacking sequence in the YPtAs type plumbides and a three-dimensional ZnPb(2-) network with distorted tetrahedral ZnPb4/4 coordination in EuZnSn. The different crystal structures are a consequence of the valence electron count, i.e. 18 for EuZnSn and 19 for the hexagonal plumbides. The crystal chemical details and bonding peculiarities are discussed.
机译:铅化物REZnPb(RE=稀土金属La-Nd和Sm-Tb)是通过密封铌安瓿中元素的感应熔化合成的。通过X射线粉末衍射对样品进行了表征。根据单晶X射线衍射仪数据细化了镨和钕化合物的结构:YPtAs型,P6(3)/mmc,a = 461.32(8),c=1658.00(3) pm,wR2= 0.0588,267个F-2值,PrZnPb的12个变量和a= 460.12(3),c=1642.7(1),wR2= 0.0617,243个F-2值,NdZnPb的12个变量。RE= La、Ce、Sm、Gd 和 Tb 的铅化物是同型的,而 Zintl 相 EuZnPb 与斜方 TiNiSi 型 Pnma,a= 796.6(2),b= 482.53(9),c= 822.9(2) pm 结晶。锌原子和铅原子形成了聚阴离子网络:YPtAs型铅质物中AA'BB'堆积序列中略微褶皱的Zn3Pb3层,以及EuZnSn中具有扭曲四面体ZnPb4/4配位的三维[ZnPb](2-)网络。不同的晶体结构是价电子数的结果,即 EuZnSn 为 18,六方铅化物为 19。讨论了晶体化学细节和键合特性。

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