Examples of Defect Chemistry in Electronic and Mixed Conductors

Examples of Defect Chemistry in Electronic and Mixed Conductors 

B-sublattice also favors vacancy formation at elevated temperatures 

It is noteworthy that the ionic conductivity in heavily doped 1x1, Sr CoO j, (LSC) and its derivatives is comparable to, or even higher than, that of most oxygen ionic conductors. In contrast. La, Sr MnO3 g (LSM) has a relatively low ionic conductivity as compared to Lii Sr CoO j g however, the thermal expansion of LSM is compatible with that of YSZ ( = (10-12) x 10 K ), whereas the CTEs of Lai Sr CoO j g are excessively high ( 20 x 10 K )- Numerous efforts are therefore made to reduce thermal expansion of cobaltites, particularly via B-site doping. 

1 Schottky, W., Uhlich, H. and Wagner, C. (1929) Thermodynamik, Springer, Berlin. 

4 Denbigh, KG. (1951) The Thermodynamics of the Steady State, John WUey Sons, New York. 

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