The spinels type ZnCr2O4 are compounds with structure of face centered cubic, these are normal
spinels for x=0 and crystallize in the space group Fd3m-Oh7. These structures possess tetrahedral
(A) and octahedral (B) sites, Zinc and Chromium occupy these sites, respectively. When this happens,
the spinel is said normal. In other case is inverse. The system Zn(1-x)MnXCr2O4 is of considerable
experimental and theoretical interest. Thus, magnetic and optical properties, such as structure
and cation distributions, have been studied thoroughly in the last four decades. In this work,
we report the optical properties of the system Zn(1-x)MnXCr2O4 as a function of the Mn molar substitution.
The samples were prepared by heating a mixture of the ZnO, CrO3 and MnO2 at 800 ºC.
Keywords: spinels, humidity sensors, electronics devices, semiconducting.