高圧力下で生成する超伝導ジャーマナイドの結晶構造と電子構造
～金属化したZintl相を求めて～

抄録

In this article, I introduced some new metallic germanides with electropositive elements. Those compounds have covalent Ge networks such as a three dimensional tunnel structure (LaGe₅), one dimensional chains of face-shared elongated Ge₆ octahedra (BaGe₃), and discrete Ge₃ triangle units (LaGe₃). The germanides showed some characteristics of Zintl type compounds, but the electrical resistivity measurements revealed that they were metallic. I made a comparison between those metallic compounds and classical Zintl phases. The electronic structures of the metallic germanides were discussed in terms of the orbital interaction between host (germanium) and guest (electropositive elements) atoms.