“…If larger cations of lower valence (e.g., Y 3+ ) are substituted for Zr 4+ , the hightemperature structures (cubic and tetragonal) can be stabilized at room temperature because the substitution introduces oxygen vacancies which compensate for the difference in charge [3]. Yttria-stabilized-zirconia (YSZ) is widely used as a catalyst, in oxygen sensors, and as the electrolyte in solid oxide fuel cells, among other applications, because of its excellent properties of low thermal conductivity, high ionic conductivity, high corrosion resistance and high refractive index [4][5][6][7]. As to zirconia and doped zirconia materials, many kinds of morphologies have been fabricated, such as nanoparticles [8], nanospheres [9], nanobelts [10], nanowires [11,12], nanotubes [13], flake-like structure [14], mesoporous structures [15], hollow structures [16][17][18][19], and etc.…”