[en] The development of oxides based on pure BaTiO₃ or containing other phases with high dielectric constants are highly required for important applications in the electronics industry, especially for microwave applications. In this context, the objective of this work is to synthesize samples of ceramic materials with theoretical composition BaTiO₃, by means of two distinct synthesis methods: Pechini and combustion reaction. It is part of the objective of this work to evaluate the influence of the synthesis methods on the structural and physical characteristics of the samples obtained and, mainly, on the relative electrical permissivity (ε_r) of the samples in response to the application of an electric signal with frequency range varying between 8 and 14 GHz. The Pechini method led to the obtaining of a sample with structural characteristics more attractive for technological applications, the combustion reaction method led to the obtaining of a sample that exhibited more expressive dielectric constant values. (author)