Structural, electrical and reflectance studies of the system ZnMn2-2xNixTixO4

X-ray, electrical conductivity and reflectance studies of the system ZnMn_2-2xNi_xTi_xO₄ have been carried out. The system is tetragonal in the range 0 ≤x ≤ 0.25 and cubic in the range 0.5 ≤x ≤ 1. Electrical resistivity temperature behaviour obeys Wilson’s law for all the compounds and the thermoelectric coefficient values vary between 325 and-290 μV/K. The activation energy and p_RT decrease gradually with increase in concentration of charge carriers atB-site except for ZnNiTiO₄. Reflectance spectral studies indicate the presence of Ni²⁺ at the octahedral site.