1. K2Mg5−x Sn3 and K3Mg18 Tt 11 (Tt=Sn, pb) with two types of Mg–Sn/Pb frameworks
- Author
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Lei, Xiao-Wu
- Subjects
- *
INTERMETALLIC compounds , *POTASSIUM compounds , *MAGNESIUM compounds , *TIN compounds , *ELECTRONIC structure , *X-ray diffraction , *LEAD compounds , *MAGNETIC properties - Abstract
Abstract: K2Mg5−x Sn3 (x=0.28) and K3Mg18 Tt 11 (Tt=Sn, Pb) have been synthesized by reacting the mixture of the corresponding pure elements at high temperature, and structurally characterized by single-crystal X-ray diffraction studies. K2Mg5−x Sn3 (x=0.28) is isostructural with Ni7−x SbQ 2 (Q=Se, Te) series and features 2D corrugated [Mg5−x Sn3] layers that are separated by K+ cations. The structure of K3Mg18 Tt 11 (Tt=Sn, Pb) is closely related to the Ho2Rh12As7 structural type and features 3D [Mg18 Tt 11] framework composed of 1D [Mg18 Tt 11] columns that are interconnected via Mg–Tt bonds, forming 1D hexagonal tunnels occupied by the K+ cations. Electronic structure calculations indicate that Mg atoms can function as either electron donor or as a participator in the network along with Tt atoms. Magnetic property measurements and band structure calculations indicate that these compounds are metallic. [Copyright &y& Elsevier]
- Published
- 2011
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