Directionally solidified single crystals of (ZrO2)1 – x(Y2O3)x solid solutions (x = 0.08–0.12) are grown. The effect of the concentration of the stabilizing yttrium oxide on the transport characteristics of the ZrO2-based single-crystal solid solutions is studied. In the studied composition range, it is the (ZrO2)0.91(Y2O3)0.09 crystal that has the maximal electrical conductivity. This crystal was milled, the resulting powder was used as a starting material for the manufacturing of ceramic samples by slip casting onto a moving substrate. The grains of the ceramic samples are sized 10–30 μm; the material density is 5.86 g/cm2. A comparative analysis of the structure and electrophysical properties of ceramic and single-crystal samples of the (ZrO2)0.91(Y2O3)0.09 solid electrolytes is carried out. The described method of the ceramic sample preparation is shown not leading to changes in their phase composition and crystal structure. The ionic conductivity of the single crystals and ceramics in the 973–1173 K temperature range were close to each other; at a temperature of 1173 K, their conductivity values are 0.076 and 0.065 S/cm, respectively.