Oxygen Nonstoichiometry and the Thermodynamic
and Structural Properties of Double Perovskites
PrBaCo_{2 x}Cu_xO_{5 +}

A. Yu. Suntsov, I. A. Leonidov, A. A. Markov, M. V. Patrakeev, Ya. N. Blinovskov,
and V. L. Kozhevnikov

Institute of Solid-State Chemistry, Ural Division, Russian Academy of Sciences,
ul. Pervomaiskaya 91, Yekaterinburg, 620041 Russia

e-mail: alexey_suntsov@mail.ru

Received March 20, 2008

Abstract—The special features of the structure, electrophysical properties, and oxygen nonstoichiometry of
new double perovskites PrBaCo_2xCu_xO₅₊ were studied. Within the homogeneity region with respect to
copper 0 < x 1, solid solution samples had an orthorhombic structure (space group Pmmm) with the param-
eters a_p 2a_p 2a_p, where a_p 3.8 Å. The oxygen nonstoichiometry of PrBaCo_2xCu_xO₅₊ changes as the
copper content increases approximately as 0.85 x/2. The content of oxygen was measured by coulom-
etric titration over wide temperature and oxygen pressure ranges. The partial thermodynamic functions of
labile oxygen were calculated and the limits of the thermodynamic stability of the solid solution were estab-
lished.

DOI: 10.1134/S0036024409050264

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