Abstract
(Y,M)BaCuFeO5 + δ (M = Ce, Ca, Na), Y(Ba,K)CuFeO5 + δ, YBa(Cu,Co)FeO5 + δ, YBaCu(Fe,M)O5 + δ (M = Zn, Nb), (Y,Ca)BaCu(Fe,Zn)O5 + δ, and (Y,Ca)(Ba,La)Cu(Fe,Zn)O5 + δ solid solutions have been prepared by ceramic processing techniques and have been characterized by x-ray diffraction, IR absorption spectroscopy, and thermal expansion and electrical conductivity (σ) measurements in air at temperatures from 300 to 1100 K. It is shown that, in the range 650–700 K, the linear thermal expansion coefficient of the (Y,M)BaCuFeO5 + δ phases rises from (11–12) × 10−6 to (14–15) × 10−6 K−1, while that of the YBa(Cu,Co)FeO5 + δ solid solution decreases from 18 × 10−6 to 14 × 10−6 K−1. The conductivity data (an increase in σ upon Ca2+ → Y3+ and Zn2+ → Fe3+ substitutions and a reduction in σ upon Ce4+ → Y3+ and Nb5+ → Fe3+ substitutions) demonstrate that the transport properties of YBaCuFeO5 + δ can be tuned by electron-hole doping.
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Original Russian Text © A.I. Klyndyuk, E.A. Chizhova, 2007, published in Neorganicheskie Materialy, 2007, Vol. 43, No. 8, pp. 969–975.
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Klyndyuk, A.I., Chizhova, E.A. Heterovalent cation substitutions in the layered compound YBaCuFeO5 + δ . Inorg Mater 43, 866–872 (2007). https://doi.org/10.1134/S0020168507080092
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DOI: https://doi.org/10.1134/S0020168507080092