CUBIC YTTERBIA STABILIZED ZIRCONIA AND SOLID OXIDE FUEL CELL USING THEM

摘要

PURPOSE: A cubic ytterbia-stabilized zirconia electrolyte is provided to maintain high power density at a temperature of 800 C or less while securing long term stability and durability and to ensure high ion conductivity. CONSTITUTION: A cubic ytterbia-stabilized zirconia electrolyte comprises a composition of (Yb_2O_3)_x(Sc_2O_3)_y(ZrO_2)_(1-x-y), the capacity of a whole stabilizer(Yb2O3+Sc2O3) is .07=x+y=0.12, the capacity of a ytterbia(Yb2O3) as a main stabilizer is higher than the capacity of scandia(Sc2O3), and the capacity of scandia(Sc2O3) is 5 mole % or less(y0.05).