Synthesis and Characterization of NaCd0.92Sn1.08, Na(Cd0.28Sn0.72)2 and Na2CdSn5 with Three-Dimensional Cd-Sn Frameworks

The crystal structures of three new ternary compounds, NaCd0.92Sn1.08 (I), Na(Cd0.28Sn0.72)2 (II), and Na2CdSn5 (III) synthesized in a sodium-cadmium-tin system were determined by single-crystal X-ray analysis to be the following: (I) LiGeZn-type structure (hexagonal, = 4.9326(1) Å, c 10.8508(3) space group P-6m2); (II) CaIn2-type 4.8458(2) 7.7569(3) P63/mmc); isotype with tI-Na2ZnSn5 (tetragonal, 6.4248(1) 22.7993(5) I-42d). Each compound has three-dimensional framework mainly composed four-fold coordinated Cd Sn atoms Na located space. Elucidation electrical properties polycrystalline samples indicated that compounds are polar intermetallics metallic conductivity, is semiconducting Zintl compound. These consistent electronic calculated using ordered models compounds.