  The structural, elastic, and electronic properties of the very recently
discovered ternary silicide superconductor, Li2IrSi3, have been calculated
using ab-initio technique. We have carried out the plane-wave pseudopotential
approach within the framework of the first-principles density functional theory
(DFT) implemented within the CASTEP code. The calculated structural parameters
show a reasonable agreement with the experimental results. Elastic moduli of
this interesting material have been calculated for the first time. The
electronic band structure and electronic energy density of states indicate the
strong covalent Ir-Si and Si-Si bonding which lead to the formation of the
rigid structure of Li2IrSi3. Strong covalency give rise to a high Debye
temperature in this system. We have discussed the theoretical results in detail
in this paper.
