SCANDIA-STABILIZED ZIRCONIA POWDER FOR SOLID OXIDE FUEL CELLS, METHOD FOR PRODUCING SAME, SCANDIA-STABILIZED ZIRCONIA SINTERED BODY FOR SOLID OXIDE FUEL CELLS, METHOD FOR PRODUCING SAID SCANDIA-STABILIZED ZIRCONIA SINTERED BODY FOR SOLID OXIDE FUEL CELLS, AND SOLID OXIDE FUEL CELL

The present invention provides a scandia-stabilized zirconia powder for solid oxide fuel cells or a scandia-stabilized zirconia sintered body for solid oxide fuel cells, each having high crystal structure stability, low grain-boundary resistivity, and high ionic conductivity; and the production methods of these. The scandia-stabilized zirconia powder for solid oxide fuel cells comprises a compound represented by formula (1): (ZrO)(ScO)(AlO). In formula (1), 0.09≤x≤0.11 and 0.002≤a