<p>In this work was obtained solid electrolytes of fully stabilized zircônia with doped of 10 and 12 mol% of <em>Re<sub>2</sub>O<sub>3</sub></em> (mixed oxides rare earth), for use in oxygen sensors and or fuel cells. The specimens were prepared by uniaxial pressing and sintered using two heating schedules, <em>S1</em> and <em>S2</em>. Impedance diagrams show that the crystalline phases and the grain size change the electrical behavior of the ceramics. The sample with the best electrical performance was obtained with 10 mol% doped and was sintered with the curve S1. The value of the total conductivity of this sample was 2,85x10<sup>-3</sup> <span style="font-family: Symbol;">W</span><sup>-1</sup>.cm<sup>-1</sup> (taken at 600 ° C). When making a comparison between this values of conductivity with the reported in the literature is identified similarity with or traditional system zirconia-yttria the most widely used commercially as electrolyte oxygen sensors and fuel cells, confirming the potential use of the oxides mixed rare earth for these specific applications.</p>