  With the intention to reveal the effect of the substitution, Ti-doped InSb
alloy, we accomplished a first-principles prediction within the FPLAPW+lo
method. We used GGA-PBEsol scheme attached with the improved TB-mBJ approach to
predict structural, electronic, and magnetic properties of In$_{1-x}$Ti$_{x}$Sb
with concentration $x = 0$, $0.125$, $0.25$, $0.50$, $0.75$, $0.875$, and $1$.
Our lattice parameters are found in favorable agreement with the available
theoretical and experimental data. The calculation shows that all structures
are energetically stable. The substitutional doping transforms the ionic
character of the InSb compound in half-metallic ferromagnetic comportment for
concentration $x = 0$, $0.125$, $0.25$, and $0.50$, with a spin polarization of
$100$% at the Fermi level, and metallic nature for In$_{0.25}$Ti$_{0.75}$Sb and
In$_{0.125}$Ti$_{0.875}$Sb. The total magnetic moments are also estimated at
about 1 $\mu_{\text{B}}$. In$_{0.875}$Ti$_{0.125}$Sb, In$_{0.75}$Ti$_{0.25}$Sb,
and In$_{0.50}$Ti$_{0.50}$Sb have half-metallic ferromagnets comportment and
they can be upcoming applicants for spintronics applications.
