1. K2Mg5−xSn3 and K3Mg18Tt11 (Tt=Sn, pb) with two types of Mg–Sn/Pb frameworks
- Author
-
Xiao-Wu Lei
- Subjects
Materials science ,Magnetic structure ,Inorganic chemistry ,Intermetallic ,Electron donor ,Crystal structure ,Electronic structure ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Inorganic Chemistry ,Metal ,chemistry.chemical_compound ,Crystallography ,chemistry ,visual_art ,Materials Chemistry ,Ceramics and Composites ,visual_art.visual_art_medium ,Physical and Theoretical Chemistry ,Isostructural ,Electronic band structure - Abstract
K 2 Mg 5− x Sn 3 ( x =0.28) and K 3 Mg 18 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. K 2 Mg 5− x Sn 3 ( x =0.28) is isostructural with Ni 7− x Sb Q 2 ( Q =Se, Te) series and features 2D corrugated [Mg 5− x Sn 3 ] layers that are separated by K + cations. The structure of K 3 Mg 18 Tt 11 ( Tt =Sn, Pb) is closely related to the Ho 2 Rh 12 As 7 structural type and features 3D [Mg 18 Tt 11 ] framework composed of 1D [Mg 18 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.
- Published
- 2011