Structure and properties of solid solutions of La1-x Pr x BaCuFeO5+δ

The effect of replacing lanthanum with praseodymium on the crystal chemistry parameters of solid solutions of La1 - x Pr (x) BaCuFeO5 + delta has been investigated using X-ray powder diffraction analysis and IR spectroscopy. The thermal expansion, electroconductivity, and thermopower of these phases have been studied in air in the temperature range 300-1100 K. The values of linear thermal expansion coefficients (LTEC) of ceramics in different temperature ranges have been determined, and the values of electric transfer parameters in the above oxides have been calculated. It has been established that replacing lanthanum with praseodymium resulted in the compression of the elementary oxide unit La1 - x Pr (x) BaCuFeO5 + delta, decrease in the content of labile oxygen in them (delta), decrease in nonmonotonic electroconductivity, increase in thermopower, decrease in LTEC, and difficulties in charge transfer in these phases.