摘要：

Intermetallic compounds constitute a very large fraction of inorganic compounds. Understanding these compounds with respect to their structures, chemical bonding, and physical properties is very important to fundamental materials science. The so-called Zintl phase (valence compound) subset of these has been of interest to many investigators for many years, and some understanding of this class of compounds has greatly broadened our views of chemical bonding^[1-3].Some progress has been achieved for compounds between alkali metals and the triels Ga, In, Tl^[4] Besides some structural reports^[5-9], ternary systems of rare earth-trels-tetrels are especially lack of broad and further exploration. Here we report more than ten new compounds characterized in these systems. The as cast samples were synthesized by High Frequency melting method inside Ar-glovebox followed by annealing in silica tubes. Lattice parameter refinements were done from powder data using Si as an internal standard. The structures were determined either from single crystal or from powder XRD full profile refinements. The physical properties of the compounds will be discussed together with their structures and bonding features. The compounds show, depending on compositions, metallic Zintl phase, magnetic ordering, heavy Fermion behaviour or other phase transitions. The compounds have both rich structural chemistry and physical properties.

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