Crystal Structure and Electrotransport Properties of LaBa_1–xM_xCuFeO5+ð(M –
Sr, Ca, Mg) Solid Solutions at High Temperatures

Andrey I. Klyndyuk
Page No. 102-108

The LaBa_1–xM_xCuFeO_5+ð (M – Sr, Ca, Mg) solid solutions had been prepared, their unit cell
parameters had been determined, and their electrical conductivity and thermo–EMF in air at 300–
1100 K had been measured. It has been found that LaBa1–xMxCuFeO_5+ðoxides have cubic structure
and are the p–type semiconductors. On the ар = f(x), d = f(x), Em = f(x), Ep = f(x) dependences for
LaBa_1–xSr_xCuFeO_5+ð solid solutions at x = 0,25 the anomalies had been detected. These anomalies
are connected, probably, with the ordering of La³⁺, Ba²⁺ and Sr²⁺ cations in the LaBa_1–
xSr_xCuFeO_5+ð structure leading to the formation of the new chemical compound
LaBa_3/4Sr_1/4CuFeO_5+ð
Keywords: Layered perovskites, solid solutions, crystal structure, oxygen nonstoichiometry,
electrical conductivity, thermo-EMF.