“…The highly conductive cubic phase is not stable below 650 • C causing the abrupt decrease in ionic conductivity during cooling in the ScZrO 2 [7,8]. It is known that in 11 mol% Sc 2 O 3 -89 mol% ZrO 2 , a cubic to rhombohedral phase transition occurs when the temperature decrease below 600 • C [9,10]. It was reported [11,12] that when ZrO 2 is stabilized with a small amount of CeO 2 along with Sc 2 O 3 , it no longer exhibits an unfavorable phase transition, making this material a very promising option for intermediate temperature electrolytes.…”