Abstract
Ti was added into acceptor-doped LaAlO 3 to enhance the mixed electronic and ionic conductivity at low Po 2. Electrical conductivities of [La 0.9Sr 0.1Al 0.9Mg 0.1O 3] 1− x [La 2 / 3 TiO 3] x (LAT) for x = 0–0.30 were measured using 4-probe d.c. method at temperatures between 1000 and 1300 °C and as a function of oxygen partial pressure (Po 2 = 1∼10 − 15 atm) at 1200 °C. Electrical conductivities in air decreased with increasing Ti contents ( x) for 0 < x < 0.15, and increased for 0.15 < x < 0.30 after showing minimum values at x = 0.15. The activation energy in air showed percolative change near x∼0.13. LAT samples for 0 ≤ x ≤ 0.10 were oxygen ion conductors in low Po 2 and mixed (p-type and ionic) conductors in high Po 2. However, for x ≥ 0.15, n-type conductivity was dominant in low Po 2. For x ≥ 0.20, the p-type conductivity in high Po 2 disappeared and the n-type conductivity was dominant in all Po 2 range and increased with increasing Ti concentration.
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