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Abstract:
The chemical bonding in the intermetallic compounds ZnPd and ZnPt with
the tetragonal CuTi type of structure, and in the chemically related
intermetallic compounds ZnNi, ZnCu, ZnAg, and ZnAu with the cubic CsCl
type of structure, is examined applying the electron localizability
approach. The analysis of the chemical bonding reveals charge transfer
from zinc to the transition metal (TM), in line with the respective
electronegativities. While in ZnNi, ZnCu, and ZnAg as well as ZnPd and
ZnPt the Zn-TM interactions are described by multi-center bonding and
ionic interactions, mainly ionic interactions are found in the
intermetallic compound ZnAu. Going from ZnNi over ZnPd to ZnPt, a
gradual change from isotropic to more and more anisotropic distribution
of the atomic interactions is detected, resulting in a more pronounced
tetragonal distortion.
