Zintl phases

Zintl phases are formed between metals with a larger electronegativity difference, so they represent transition forms to ionic bonding. This is expressed in their crystal structures, which partly correspond to those of ionic compounds.

Tab. 1
Examples of Zintl phases
Grid typeExamples
Cesium chlorideLiAg, LiHg, LiTl, MgAg, CaHg, SrTl
FluoriteMg5Cu, Mg2Pb
AuCu3NaPb3, CaCu3, CaTl3
Sodium thallideNaTl, NaIn, LiGa, LiIn, LiZn

The Zintl phases are generally stoichiometric with in some cases very narrow phase widths.

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