  The structural, electronic and magnetic properties of half-Heusler compounds
XVSb (X $=$ Fe, Co and Ni) are investigated by using the density functional
theory with generalized gradient approximation (GGA), and Tran-Blaha modified
Becke-Johnson (TB-mBJ) exchange potential approximation. It is found that the
half-metallic gaps are generally reasonably widened by mBJ as compared to the
GGA approximation. The magnetic proprieties of XVSb (X $=$ Fe, Co and Ni) are
well defined within mBJ with an exact integer value of magnetic moment. The
band gaps given by TB-mBJ are in good agreement with the available theoretical
data. The FeVSb exhibits a semiconductor nature. The CoVSb and NiVSb present
half-metallic behaviour with total magnetic moment of $1\mu_\text{B}$ and
$2\mu_\text{B}$ in good agreement with Slater-Pauling rule. These alloys seem
to be a potential candidate of spintronic devices.
