Abstract
Five A-site deficient perovskites (, 0.05, 0.10, 0.15, and 0.20) were synthesized using the glycine-nitrate process. The perovskites were characterized with powder X-ray diffraction (XRD), dilatometry, four-point dc conductivity measurements, and electrochemical impedance spectroscopy using cone-shaped electrodes on a electrolyte. XRD revealed that only the compounds with 0.01 and 0.05 were of single phase. The other compounds contained an additional phase in the form of a Co–Fe spinel. The thermal expansion coefficient decreased systematically with an increase in . The total conductivity followed the small polaron hopping process below a certain characteristic temperature. The total conductivity decreased with increasing . It was likewise shown that the polarization resistance found a minimum for the compound with 0.05, with a total area specific resistance more than 3 times lower than the weakly A-site deficient perovskite.
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