Structure and Properties of the Ln’_0,5Ln”_0,5BaCuFeO_5+ð(Ln’, Ln” – REE) Solid Solutions

Andey I. Klyndyuk, Yekaterina A. Chizhova
Page no. 85-90

The ceramic samples of the layered ferrocuprates Ln'_0,5Ln''_0,5BaCuFeO_5+d (Ln', Ln'' – La, Pr, Sm, Gd, Yb) solid solutions using solid-state reactions method were prepared and their crystal structure, oxygen nonstoichiometry, thermal expansion, electrical conductivity and thermo-EMF were investigated. It is found, that Ln'_0,5Ln''_0,5BaCuFeO_5+d oxides are the p-type semiconductors. It is shown, that structural characteristics, oxygen nonstoichiometry, linear thermal expansion coefficient and activation energy of electrical conductivity of layered ferrocuprates depend on sizes of REE cations in their composition, but electrical conductivity and thermo-EMF values depend on electronic configuration of ones.

Keywords: Layered perovskites, solid solutions, crystal structure, thermal expansion, electrical conductivity, thermo-EMF.