Structure and Properties
of Solid Solutions of La_{1 x}Pr_xBaCuFeO_{5 +}

A. I. Klyndyuk and E. A. Chizhova

Belarus State University of Technology, ul. Sverdlova 13a, Minsk, 220006 Belarus

e-mail: kai@rambler.ru

Received August 16, 2010

Abstract—The effect of replacing lanthanum with praseodymium on the crystal chemistry parameters of solid
solutions of La_{1 – x}Pr_xBaCuFeO_{5 +} has been investigated using X-ray powder diffraction analysis and IR spectros-
copy. 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 differ-
ent 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 com-
pression of the elementary oxide unit La_{1 – x}Pr_xBaCuFeO_{5 +} , decrease in the content of labile oxygen in them (),
decrease in nonmonotonic electroconductivity, increase in thermopower, decrease in LTEC, and difficulties in
charge transfer in these phases.

Keywords: layered oxides, solid solutions, thermal expansion, electroconductivity, thermopower

DOI: 10.1134/S1087659612020058

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