[en] The aim of this work is to synthesize Mn-Zn ferrite powders by the combustion method using glycine as fuel. The influence of the substitution of the Mn²⁺ by the Fe²⁺ on the structural parameters of the powders also was investigated by X rays diffraction. According to the results it can be observed that the decrease in concentration of the metallic ions favored the formation of single crystalline Mn-Zn ferrite phase and the substitution of the Mn²⁺ by Fe²⁺ conferred a decrease in the crystallite size and in the lattice parameters of aleatory mixed spinel. All the powders presented high crystallinity and crystallite size between 37 and 39 nm. (author)