  We investigate the doping effects of magnetic and nonmagnetic impurities
injected to the honeycomb iridate sample of Na2IrO3 . Both the doping result in
changing the ordering temperature as well as the Curie-Weiss temperature of the
parent sample as a consequence of enhancement of the lattice frustration,
screening of the Ir atoms and spin-orbit effects that reflects in the
susceptibility and specific heat measurements. Our findings are corroborated by
a detailed comparative study of various magnetic and nonmagnetic impurity atoms
that have notable effects on different electronic properties of the doped
compounds.
