Abstract
The effect of cobalt deficiency on the structural phase transition in the double layered cobaltite EuBaCo2–xO6–δ has been investigated using differential scanning calorimetry and high-temperature X-ray diffraction. It has been shown that, upon introduction of 5% cobalt vacancies, the energy and temperature of the phase transition from the orthorhombic unit cell (space group Pmmm) to the tetragonal unit cell (space group P4/mmm) decrease by 6% and 11°C, respectively, as compared to the corresponding values typical of stoichiometric EuBaCo2O6–δ. A model of the formation of cobalt–oxygen vacancies has been proposed.
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