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Abstract
Cation-deficient LaBaCuFeO5+δ samples have been synthesized, and their unit cell parameters have been determined. The thermal expansion, electrical conductivity, and thermo emf of these samples have been measured in air in the temperature range 300–1100 K. The oxides, like LaBaCuFeO5+δ, are p-type semiconductors. The lanthanum deficiency leads to an increase in the size of the LaBaCuFeO5+δ unit cell and has practically no effect on its thermo-and electrophysical properties. The formation of cationic vacancies in the-[Ba(Cu,Fe)2O5]∞-blocks of the LaBaCuFeO5+δ phase leads to the tetragonal distortion of its cubic structure and a decrease in the thermal expansion coefficient and conductivity of the samples. The decrease in conductivity is mainly caused by an increase in the energy of transfer of charge carriers, holes, in the-(Cu,Fe)O2-layers of LaBaCuFeO5+δ.
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