Abstract
The content of oxygen in Ca0.6 − ySr0.4LayMnO3 − δ, where y = 0 and 0.05, was determined by coulometric titration over the temperature range 650–950°C at oxygen partial pressure in the gas phase varied from 10−4 to 1 atm. The results were used to calculate the partial molar enthalpy, Δ\( \bar H \)O(δ), and entropy, Δ\( \bar S \)O(δ), of oxygen in manganites. Changes in the Δ\( \bar H \)O(δ) and Δ\( \bar S \)O(δ) dependences caused by the introduction of lanthanum are evidence of the formation of local clusters of the double perovskite type in the Ca0.6Sr0.4MnO3 − δ matrix.
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