 The most common electrolyte, again similar to solid-oxide fuel cells, is a dense ionic conductor consisting of ZrO2 doped with 8 mol % Y2O3 (also known as YSZ).Zirconia dioxide is used because of its high strength, high melting temperature (approximately 2700 °C) and excellent corrosion resistance.Y2O3 is added to mitigate the phase transition from the tetragonal to the monoclinic phase on rapid cooling, which can lead to cracks and decrease the conductive properties of the electrolyte by causing scattering.