Abstract
Oxygen diffusion in the new class of cuprates Pr2-xSrxCuO4-δ (x = 1) with perovskite structure has been simulated in the temperature range of 300–2100 K for the first time. A calculation has shown the presence of anisotropy of oxygen motion: the oxygen transport in PrSrCuO3.7 in the temperature range of 300–2100 K is mainly two-dimensional, with an activation energy of no more than 0.40 eV. The coefficient of thermal expansion of PrSrCuO3.7 (9.9 × 10−6 K−1 in the range 1300–2100 K) and the oxygen diffusivity in it, which exceed the corresponding values for La2-xSrxCuO4-δ, indicate that this compound is promising as an electrode material with a mixed ionic-electronic conductivity for various electrochemical devices. The results expand the previous concepts of the oxygen-ion transport in complex cuprates.
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