We have investigated the electronic structure and chemical bonding properties of Ti3GeC2 by performing ab initio pseudopotential total-energy calculations. Our results show that the crystal structure of Ti3GeC2 is a characteristic zigzag chain of Ti-C-Ti-C-Ti-Ge, running parallel to the c-axis. The chemical bonding in Ti3GeC2 is anisotropic and metallic-covalent-ionic in nature with significant contributions from metallic and covalent bonds, which result in the combination of metallic and ceramic properties in Ti3GeC2.
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