  Magnetization, neutron diffraction and X-ray diffraction of Zn doped MnV2O4
as a function of temperature have been measured and the critical exponents and
magnetocaloric effect of this system have been estimated. It is observed, that
with increase in Zn substitution the noncollinear orientation of Mn spins with
the V spins decreases which effectively leads to the decrease of structural
transition temperature more rapidly than Curie temperature. It has been shown
that the obtained values of {\beta}, {\gamma} and {\delta} from different
methods match very well. These values do not belong to universal class and the
values are in between the 3D Heisenberg model and mean field interaction model.
The magnetization data follow the scaling equation and collapse into two
branches indicating that the calculated critical exponents and critical
temperature are unambiguous and intrinsic to the system. The observed double
peaks in magneto-caloric curve of Mn0.95Zn0.05V2O4 is due to the strong
distortion of VO6 octahedra.
