The conductivity of material which was stabilized with 8mol% of scandia and yttria was measured, by using the complex impedance method, at temperatures ranging from 573 to 1173K. It was found that, with increasing Sc2O3 concentration, the conductivity increased at temperatures above 640K, but decreased below this temperature. It was concluded that the conductivity of the electrolytes was the result of 2 processes. One was governed by an activation energy of 59 to 79kJ/mol, and predominated at high temperatures. The other involved an activation energy of 109 to 125kJ/mol, and predominated at low temperatures.

H.Kaneko, F.Jin, H.Taimatsu, H.Kusakabe: Journal of the American Ceramic Society, 1993, 76[3], 793-5