Abstract
A new series of doped-Ruddlesden-Popper phases, of general formula Sr 3M 2 − x M′ x O 7 − y ( M = Ti, Zr; M′ = Al, Ga, In) were synthesized and their conductivity was investigated as a function of temperature and oxygen partial pressure. The highest total conductivity in air is 1.6 × 10 −3 S/cm at 950 °C for both Sr 3Ti 1.75Ga 0.25O 6.875 and Sr 3Ti 1.9In 0.1O 6.95. Measurements of the conductivity as a function of oxygen partial pressure indicate that p-type electronic conductivity predominates at high p( O 2), while a p( O 2)-independent region at intermediate p( O 2) values indicates ionic conductivity. The magnitude of the ionic conductivity at 700 °C is approximately 10 −5 S/cm.
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